COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XVI. Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring* [COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring]

Courbin, F.; Bonvin, V.; Buckley-Geer, E.; Fassnacht, C. D.; Frieman, J.; Lin, H.; Marshall, P. J.; Suyu, S. H.; Treu, T.; Anguita, T.; Motta, V.; Meylan, G.; Paic, E.; Tewes, M.; Agnello, A.; Chao, D. C. -Y.; Chijani, M.; Gilman, D.; Rojas, K.; Williams, P.; Hempel, A.; Kim, S.; Lachaume, R.; Rabus, M.; Abbott, T. M.  C.; Allam, S.; Annis, J.; Banerji, M.; Bechtol, K.; Benoit-Lévy, A.; Brooks, D.; Burke, D. L.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; D’Andrea, C. B.; da Costa, L. N.; Davis, C.; DePoy, D. L.; Desai, S.; Flaugher, B.; Fosalba, P.; García-Bellido, J.; Gaztanaga, E.; Goldstein, D. A.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Honscheid, K.; James, D. J.; Kuehn, K.; Kuhlmann, S.; Kuropatkin, N.; Lahav, O.; Lima, M.; Maia, M. A.  G.; March, M.; Marshall, J. L.; McMahon, R. G.; Menanteau, F.; Miquel, R.; Nord, B.; Plazas, A. A.; Sanchez, E.; Scarpine, V.; Schindler, R.; Schubnell, M.; Sevilla-Noarbe, I.; Smith, M.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Tarle, G.; Tucker, D. L.; Walker, A. R.; Wester, W.

doi:10.1051/0004-6361/201731461

Title: COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XVI. Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring* [COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring]

Abstract

We present time-delay measurements for the new quadruple imaged quasar DES J04085354, the first quadruple imaged quasar found in the Dark Energy Survey (DES). Our result is made possible by implementing a new observational strategy using almost daily observations with the MPIA 2.2 m telescope at La Silla observatory and deep exposures reaching a signal-to-noise ratio of about 1000 per quasar image. This data qualityallows us to catch small photometric variations (a few mmag rms) of the quasar, acting on temporal scales much shorter than microlensing, and hence making the time delay measurement very robust against microlensing. In only seven months we very accurately measured one of the time delays in DES J04085354: - "t(AB) = 112.1 ± 2.1 days (1.8%) using only the MPIA 2.2 m data. In combination with data taken with the 1.2 m Euler Swiss telescope, we also measured two delays involving the D component of the system - "t(AD) = ± 12.8 days (8.2%) and - "t(BD) = 42.4 ± 17.6 days (41%), where all the error bars include systematics. Turning these time delays into cosmological constraints will require deep Hubble Space Telescope (HST) imaging or ground-based adaptive optics (AO), and information on the velocitymore » field of the lensing galaxy.« less

Authors:

Courbin, F.;

; Buckley-Geer, E.; Fassnacht, C. D.; Frieman, J.; Lin, H.; Marshall, P. J.; Suyu, S. H.; Treu, T.; Anguita, T.; Motta, V.; Meylan, G.; Paic, E.; Tewes, M.; Agnello, A.; Chao, D. C. -Y.; Chijani, M.; Gilman, D.; Rojas, K.; Williams, P. more »

Publication Date:: Tue Jan 09 00:00:00 EST 2018

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Org.:: DES Collaboration; DES

OSTI Identifier:: 1419986

Alternate Identifier(s):: OSTI ID: 1422478; OSTI ID: 1429333; OSTI ID: 1487082

Report Number(s):: arXiv:1706.09424; FERMILAB-PUB-17-204-AE
Journal ID: ISSN 0004-6361; PII: aa31461-17; TRN: US1801434

Grant/Contract Number:: AC02-76SF00515; AC05-00OR22725; AC02-07CH11359; AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Astronomy and Astrophysics

Additional Journal Information:: Journal Volume: 609; Journal ID: ISSN 0004-6361

Publisher:: EDP Sciences

Country of Publication:: United States

Language:: English

Subject:: 79 ASTRONOMY AND ASTROPHYSICS; methods: data analysis; gravitational lensing: strong; cosmological parameters; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats


                    Courbin, F., Bonvin, V., Buckley-Geer, E., Fassnacht, C. D., Frieman, J., Lin, H., Marshall, P. J., Suyu, S. H., Treu, T., Anguita, T., Motta, V., Meylan, G., Paic, E., Tewes, M., Agnello, A., Chao, D. C. -Y., Chijani, M., Gilman, D., Rojas, K., Williams, P., Hempel, A., Kim, S., Lachaume, R., Rabus, M., Abbott, T. M.  C., Allam, S., Annis, J., Banerji, M., Bechtol, K., Benoit-Lévy, A., Brooks, D., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., D’Andrea, C. B., da Costa, L. N., Davis, C., DePoy, D. L., Desai, S., Flaugher, B., Fosalba, P., García-Bellido, J., Gaztanaga, E., Goldstein, D. A., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Honscheid, K., James, D. J., Kuehn, K., Kuhlmann, S., Kuropatkin, N., Lahav, O., Lima, M., Maia, M. A.  G., March, M., Marshall, J. L., McMahon, R. G., Menanteau, F., Miquel, R., Nord, B., Plazas, A. A., Sanchez, E., Scarpine, V., Schindler, R., Schubnell, M., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Suchyta, E., Tarle, G., Tucker, D. L., Walker, A. R., and Wester, W. COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XVI. Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring* [COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring].  United States: N. p., 2018. 
Web.  doi:10.1051/0004-6361/201731461.

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                    Courbin, F., Bonvin, V., Buckley-Geer, E., Fassnacht, C. D., Frieman, J., Lin, H., Marshall, P. J., Suyu, S. H., Treu, T., Anguita, T., Motta, V., Meylan, G., Paic, E., Tewes, M., Agnello, A., Chao, D. C. -Y., Chijani, M., Gilman, D., Rojas, K., Williams, P., Hempel, A., Kim, S., Lachaume, R., Rabus, M., Abbott, T. M.  C., Allam, S., Annis, J., Banerji, M., Bechtol, K., Benoit-Lévy, A., Brooks, D., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., D’Andrea, C. B., da Costa, L. N., Davis, C., DePoy, D. L., Desai, S., Flaugher, B., Fosalba, P., García-Bellido, J., Gaztanaga, E., Goldstein, D. A., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Honscheid, K., James, D. J., Kuehn, K., Kuhlmann, S., Kuropatkin, N., Lahav, O., Lima, M., Maia, M. A.  G., March, M., Marshall, J. L., McMahon, R. G., Menanteau, F., Miquel, R., Nord, B., Plazas, A. A., Sanchez, E., Scarpine, V., Schindler, R., Schubnell, M., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Suchyta, E., Tarle, G., Tucker, D. L., Walker, A. R., & Wester, W. COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XVI. Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring* [COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring].  United States.  https://doi.org/10.1051/0004-6361/201731461

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                    Courbin, F., Bonvin, V., Buckley-Geer, E., Fassnacht, C. D., Frieman, J., Lin, H., Marshall, P. J., Suyu, S. H., Treu, T., Anguita, T., Motta, V., Meylan, G., Paic, E., Tewes, M., Agnello, A., Chao, D. C. -Y., Chijani, M., Gilman, D., Rojas, K., Williams, P., Hempel, A., Kim, S., Lachaume, R., Rabus, M., Abbott, T. M.  C., Allam, S., Annis, J., Banerji, M., Bechtol, K., Benoit-Lévy, A., Brooks, D., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., D’Andrea, C. B., da Costa, L. N., Davis, C., DePoy, D. L., Desai, S., Flaugher, B., Fosalba, P., García-Bellido, J., Gaztanaga, E., Goldstein, D. A., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Honscheid, K., James, D. J., Kuehn, K., Kuhlmann, S., Kuropatkin, N., Lahav, O., Lima, M., Maia, M. A.  G., March, M., Marshall, J. L., McMahon, R. G., Menanteau, F., Miquel, R., Nord, B., Plazas, A. A., Sanchez, E., Scarpine, V., Schindler, R., Schubnell, M., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Sobreira, F., Suchyta, E., Tarle, G., Tucker, D. L., Walker, A. R., and Wester, W. Tue .  
"COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XVI. Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring* [COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring]".  United States.  https://doi.org/10.1051/0004-6361/201731461.  https://www.osti.gov/servlets/purl/1419986.

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@article{osti_1419986,

  title        = {COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XVI. Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring* [COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring]},

  author       = {Courbin, F. and Bonvin, V. and Buckley-Geer, E. and Fassnacht, C. D. and Frieman, J. and Lin, H. and Marshall, P. J. and Suyu, S. H. and Treu, T. and Anguita, T. and Motta, V. and Meylan, G. and Paic, E. and Tewes, M. and Agnello, A. and Chao, D. C. -Y. and Chijani, M. and Gilman, D. and Rojas, K. and Williams, P. and Hempel, A. and Kim, S. and Lachaume, R. and Rabus, M. and Abbott, T. M.  C. and Allam, S. and Annis, J. and Banerji, M. and Bechtol, K. and Benoit-Lévy, A. and Brooks, D. and Burke, D. L. and Carnero Rosell, A. and Carrasco Kind, M. and Carretero, J. and D’Andrea, C. B. and da Costa, L. N. and Davis, C. and DePoy, D. L. and Desai, S. and Flaugher, B. and Fosalba, P. and García-Bellido, J. and Gaztanaga, E. and Goldstein, D. A. and Gruen, D. and Gruendl, R. A. and Gschwend, J. and Gutierrez, G. and Honscheid, K. and James, D. J. and Kuehn, K. and Kuhlmann, S. and Kuropatkin, N. and Lahav, O. and Lima, M. and Maia, M. A.  G. and March, M. and Marshall, J. L. and McMahon, R. G. and Menanteau, F. and Miquel, R. and Nord, B. and Plazas, A. A. and Sanchez, E. and Scarpine, V. and Schindler, R. and Schubnell, M. and Sevilla-Noarbe, I. and Smith, M. and Soares-Santos, M. and Sobreira, F. and Suchyta, E. and Tarle, G. and Tucker, D. L. and Walker, A. R. and Wester, W.},

  abstractNote = {We present time-delay measurements for the new quadruple imaged quasar DES J04085354, the first quadruple imaged quasar found in the Dark Energy Survey (DES). Our result is made possible by implementing a new observational strategy using almost daily observations with the MPIA 2.2 m telescope at La Silla observatory and deep exposures reaching a signal-to-noise ratio of about 1000 per quasar image. This data qualityallows us to catch small photometric variations (a few mmag rms) of the quasar, acting on temporal scales much shorter than microlensing, and hence making the time delay measurement very robust against microlensing. In only seven months we very accurately measured one of the time delays in DES J04085354: - "t(AB) = 112.1 ± 2.1 days (1.8%) using only the MPIA 2.2 m data. In combination with data taken with the 1.2 m Euler Swiss telescope, we also measured two delays involving the D component of the system - "t(AD) = ± 12.8 days (8.2%) and - "t(BD) = 42.4 ± 17.6 days (41%), where all the error bars include systematics. Turning these time delays into cosmological constraints will require deep Hubble Space Telescope (HST) imaging or ground-based adaptive optics (AO), and information on the velocity field of the lensing galaxy.},

  doi          = {10.1051/0004-6361/201731461},

  journal      = {Astronomy and Astrophysics},

  number       = ,

  volume       = 609,

  place        = {United States},

  year         = {Tue Jan 09 00:00:00 EST 2018},

  month        = {Tue Jan 09 00:00:00 EST 2018}

}

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Fig. 1: Part of the field of view around DES J0408−5354 as seen with the 2.2m MPIA/ESO telescope at La Silla observatory. The image is a stack of 150 frames totaling 25h of exposure. The 6 PSF stars used to obtain the photometric light curves with deconvolution photometry are indicatedmore »

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COSMOGRAIL: XVII. Time delays for the quadruply imaged quasar PG 1115+080

Journal Article Bonvin, Vivien ; Chan, J. H. H. ; Millon, M. ; ... - Astronomy and Astrophysics

Here, we present time-delay estimates for the quadruply imaged quasar PG 1115+080. Our results are based on almost daily observations for seven months at the ESO MPIA 2.2m telescope at La Silla Observatory, reaching a signal-to-noise ratio of about 1000 per quasar image. In addition, we re-analyze existing light curves from the literature that we complete with an additional three seasons of monitoring with the Mercator telescope at La Palma Observatory. When exploring the possible source of bias we consider the so-called microlensing time delay, a potential source of systematic error so far never directly accounted for in previous time-delaymore »« less
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We present new measurements of the time delays of WFI2033-4723. The data sets used in this work include 14 years of data taken at the 1.2m Leonhard Euler Swiss telescope, 13 years of data from the SMARTS 1.3m telescope at Las Campanas Observatory and a single year of high-cadence and high-precision monitoring at the MPIA 2.2m telescope. The time delays measured from these different data sets, all taken in the R-band, are in good agreement with each other and with previous measurements from the literature. Combining all the time-delay estimates from our data sets results in Dt_AB = 36.2-0.8+0.7 daysmore »« less
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In time-delay cosmography, three of the key ingredients are (1) determining the velocity dispersion of the lensing galaxy, (2) identifying galaxies and groups along the line of sight with sufficient proximity and mass to be included in the mass model, and (3) estimating the external convergence κext from less massive structures that are not included in the mass model. We present results on all three of these ingredients for two time-delay lensed quad quasar systems, DES J0408–5354 and WGD 2038–4008 . We use the Gemini, Magellan, and VLT telescopes to obtain spectra to both measure the stellar velocity dispersions of the main lensing galaxies and to identify the line-of-sight galaxies in these systems. Next, we identify 10 groups in DES J0408–5354 and two groups in WGD 2038–4008 using a group-finding algorithm. We then identify the most significant galaxy and galaxy-group perturbers using the ‘flexion shift’ criterion. We determine the probability distribution function of the external convergence κext for both of these systems based on our spectroscopy and on the DES-only multiband wide-field observations. Using weighted galaxy counts, calibrated based on the Millennium Simulation, we find that DES J0408–5354 is located in a significantly underdense environment, leading to a tight (widthmore »« less
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Title: COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XVI. Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring* [COSMOGRAIL XVI: Time delays for the quadruply imaged quasar DES J0408–5354 with high-cadence photometric monitoring]

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Figures / Tables:

SExtractor: Software for source extraction journal, June 1996

VDES J2325−5229 a z = 2.7 gravitationally lensed quasar discovered using morphology-independent supervised machine learning journal, November 2016

A 2.4% Determination of the Local Value of the Hubble Constant journal, July 2016

Models of the strongly lensed quasar DES J0408−5354 journal, September 2017

Ray-tracing through the Millennium Simulation: Born corrections and lens-lens coupling in cosmic shear and galaxy-galaxy lensing journal, March 2009

A Bayesian analysis of regularized source inversions in gravitational lensing journal, September 2006

Discovery of the Lensed Quasar System DES J0408-5354 journal, March 2017

Cosmology from Gravitational lens time Delays and Planck data journal, June 2014

H0LiCOW – III. Quantifying the effect of mass along the line of sight to the gravitational lens HE 0435−1223 through weighted galaxy counts★ journal, February 2017

H0LiCOW – I. H0 Lenses in COSMOGRAIL's Wellspring: program overview journal, February 2017

On the Possibility of Determining Hubble's Parameter and the Masses of Galaxies from the Gravitational Lens Effect journal, September 1964

Dissecting the Gravitational lens B1608+656. i. lens Potential Reconstruction journal, January 2009

Measuring angular diameter distances of strong gravitational lenses journal, November 2015

Planck 2015 results : XIII. Cosmological parameters journal, September 2016

H0LiCOW – V. New COSMOGRAIL time delays of HE 0435−1223: H 0 to 3.8 per cent precision from strong lensing in a flat ΛCDM model journal, November 2016

Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant journal, May 2001

Deconvolution with Correct Sampling journal, February 1998

A new hybrid framework to efficiently model lines of sight to gravitational lenses journal, August 2014

Dissecting the Gravitational lens B1608+656. ii. Precision Measurements of the Hubble Constant, Spatial Curvature, and the dark Energy Equation of State journal, February 2010

Firedec: a two-channel finite-resolution image deconvolution algorithm journal, April 2016

The Microlensing Properties of a Sample of 87 Lensed Quasars journal, August 2011

Quantifying Environmental and Line-of-sight Effects in Models of Strong Gravitational Lens Systems journal, February 2017

Strong lens time Delay Challenge. ii. Results of tdc1 journal, February 2015

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XIII. Time delays and 9-yr optical monitoring of the lensed quasar RX J1131−1231 journal, July 2013

Discovery of two gravitationally lensed quasars in the Dark Energy Survey journal, October 2015

H0LiCOW – IV. Lens mass model of HE 0435−1223 and blind measurement of its time-delay distance for cosmology journal, November 2016

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: VII. Time delays and the Hubble constant from WFI J2033–4723 journal, July 2008

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XIV. Time delay of the doubly lensed quasar SDSS J1001+5027 journal, August 2013

The internal structure of the lens PG1115+080: breaking degeneracies in the value of the Hubble constant journal, September 2002

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XI. Techniques for time delay measurement in presence of microlensing journal, May 2013

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XV. Assessing the achievability and precision of time-delay measurements journal, December 2015

COSMOGRAIL: The COSmological MOnitoring of GRAvItational Lenses: I. How to sample the light curves of gravitationally lensed quasars to measure accurate time delays journal, May 2005

Reconstructing the lensing mass in the Universe from photometric catalogue data journal, April 2013

H0LiCOW – II. Spectroscopic survey and galaxy-group identification of the strong gravitational lens system HE 0435−1223 journal, June 2017

Cosmology at a crossroads journal, May 2017

KEPLER OBSERVATIONS OF RAPID OPTICAL VARIABILITY IN ACTIVE GALACTIC NUCLEI journal, November 2011

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: IX. Time delays, lens dynamics and baryonic fraction in HE 0435-1223 journal, December 2011

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses journal, July 2004

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COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: V. The time delay in SDSS J1650+4251 journal, January 2007

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: VIII. Deconvolution of high resolution near-IR images and simple mass models for 7 gravitationally lensed quasars journal, November 2010

Cosmology at a Crossroads journal, September 2009

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XII. Time delays of the doubly lensed quasars SDSS J1206+4332 and HS 2209+1914 journal, May 2013

Planck 2015 results : X. Diffuse component separation: Foreground maps journal, September 2016

Planck 2015 results : XVI. Isotropy and statistics of the CMB journal, September 2016

Planck 2015 results : XXVI. The Second journal, September 2016

H0LiCOW - V. New COSMOGRAIL time delays of HE 0435-1223: H0 to 3.8 per cent precision from strong lensing in a flat ΛCDM model text, January 2017

VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning text, January 2017

Dissecting the Gravitational Lens B1608+656. I. Lens Potential Reconstruction text, January 2008

Ray-tracing through the Millennium Simulation: Born corrections and lens-lens coupling in cosmic shear and galaxy-galaxy lensing text, January 2008

Dissecting the Gravitational Lens B1608+656. II. Precision Measurements of the Hubble Constant, Spatial Curvature, and the Dark Energy Equation of State text, January 2009

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses IX. Time delays, lens dynamics and baryonic fraction in HE 0435-1223 text, January 2010

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XIII: Time delays and 9-yr optical monitoring of the lensed quasar RX J1131-1231 text, January 2012

Reconstructing the Lensing Mass in the Universe from Photometric Catalogue Data text, January 2013

Cosmology from gravitational lens time delays and Planck data text, January 2013

Planck 2015 results. XIII. Cosmological parameters text, January 2015

Discovery of two gravitationally lensed quasars in the Dark Energy Survey text, January 2015

A 2.4% Determination of the Local Value of the Hubble Constant text, January 2016

H0LiCOW I. $H_0$ Lenses in COSMOGRAIL's Wellspring: Program Overview text, January 2016

H0LiCOW II. Spectroscopic survey and galaxy-group identification of the strong gravitational lens system HE0435-1223 text, January 2016

H0LiCOW III. Quantifying the effect of mass along the line of sight to the gravitational lens HE 0435-1223 through weighted galaxy counts text, January 2016

VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning text, January 2016

Models of the strongly lensed quasar DES J0408-5354 text, January 2017

Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant text, January 2000

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses I. How to sample the light curves of gravitationally lensed quasars to measure accurate time delays text, January 2005

A Bayesian analysis of regularised source inversions in gravitational lensing text, January 2006

Deconvolution with correct sampling text, January 1997

COSMOGRAIL: the COSmological MOnitoring of GRAvItational lenses. VII. Time delays and the Hubble constant from WFI J2033-4723 text, January 2008

Impact of the 3D source geometry on time-delay measurements of lensed type-Ia supernovae journal, January 2019

COSMOGRAIL: XVIII. time delays of the quadruply lensed quasar WFI2033−4723⋆ journal, September 2019

The Hubble constant determined through an inverse distance ladder including quasar time delays and Type Ia supernovae journal, August 2019

Constraining the microlensing effect on time delays with a new time-delay prediction model in H0 measurements journal, September 2018

The role of multiple images and model priors in measuring H 0 from supernova Refsdal in galaxy cluster MACS J1149.5+2223 journal, November 2018

Gravitationally lensed quasars in Gaia – III. 22 new lensed quasars from Gaia data release 2 journal, December 2018

Is every strong lens model unhappy in its own way? Uniform modelling of a sample of 13 quadruply+ imaged quasars journal, December 2018

H0LiCOW – IX. Cosmographic analysis of the doubly imaged quasar SDSS 1206+4332 and a new measurement of the Hubble constant journal, January 2019

SExtractor: Software for source extraction
journal, June 1996

VDES J2325−5229 a z = 2.7 gravitationally lensed quasar discovered using morphology-independent supervised machine learning
journal, November 2016

A 2.4% Determination of the Local Value of the Hubble Constant
journal, July 2016

Models of the strongly lensed quasar DES J0408−5354
journal, September 2017

Ray-tracing through the Millennium Simulation: Born corrections and lens-lens coupling in cosmic shear and galaxy-galaxy lensing
journal, March 2009

A Bayesian analysis of regularized source inversions in gravitational lensing
journal, September 2006

Discovery of the Lensed Quasar System DES J0408-5354
journal, March 2017

Cosmology from Gravitational lens time Delays and Planck data
journal, June 2014

H0LiCOW – III. Quantifying the effect of mass along the line of sight to the gravitational lens HE 0435−1223 through weighted galaxy counts★
journal, February 2017

H0LiCOW – I. H0 Lenses in COSMOGRAIL's Wellspring: program overview
journal, February 2017

On the Possibility of Determining Hubble's Parameter and the Masses of Galaxies from the Gravitational Lens Effect
journal, September 1964

Dissecting the Gravitational lens B1608+656. i. lens Potential Reconstruction
journal, January 2009

Measuring angular diameter distances of strong gravitational lenses
journal, November 2015

Planck 2015 results : XIII. Cosmological parameters
journal, September 2016

H0LiCOW – V. New COSMOGRAIL time delays of HE 0435−1223: H ₀ to 3.8 per cent precision from strong lensing in a flat ΛCDM model
journal, November 2016

Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
journal, May 2001

Deconvolution with Correct Sampling
journal, February 1998

A new hybrid framework to efficiently model lines of sight to gravitational lenses
journal, August 2014

Dissecting the Gravitational lens B1608+656. ii. Precision Measurements of the Hubble Constant, Spatial Curvature, and the dark Energy Equation of State
journal, February 2010

Firedec: a two-channel finite-resolution image deconvolution algorithm
journal, April 2016

The Microlensing Properties of a Sample of 87 Lensed Quasars
journal, August 2011

Quantifying Environmental and Line-of-sight Effects in Models of Strong Gravitational Lens Systems
journal, February 2017

Strong lens time Delay Challenge. ii. Results of tdc1
journal, February 2015

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XIII. Time delays and 9-yr optical monitoring of the lensed quasar RX J1131−1231
journal, July 2013

Discovery of two gravitationally lensed quasars in the Dark Energy Survey
journal, October 2015

H0LiCOW – IV. Lens mass model of HE 0435−1223 and blind measurement of its time-delay distance for cosmology
journal, November 2016

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: VII. Time delays and the Hubble constant from WFI J2033–4723
journal, July 2008

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XIV. Time delay of the doubly lensed quasar SDSS J1001+5027
journal, August 2013

The internal structure of the lens PG1115+080: breaking degeneracies in the value of the Hubble constant
journal, September 2002

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XI. Techniques for time delay measurement in presence of microlensing
journal, May 2013

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XV. Assessing the achievability and precision of time-delay measurements
journal, December 2015

COSMOGRAIL: The COSmological MOnitoring of GRAvItational Lenses: I. How to sample the light curves of gravitationally lensed quasars to measure accurate time delays
journal, May 2005

Reconstructing the lensing mass in the Universe from photometric catalogue data
journal, April 2013

H0LiCOW – II. Spectroscopic survey and galaxy-group identification of the strong gravitational lens system HE 0435−1223
journal, June 2017

Cosmology at a crossroads
journal, May 2017

KEPLER OBSERVATIONS OF RAPID OPTICAL VARIABILITY IN ACTIVE GALACTIC NUCLEI
journal, November 2011

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: IX. Time delays, lens dynamics and baryonic fraction in HE 0435-1223
journal, December 2011

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses
journal, July 2004

Planck 2015 results : XXIII. The thermal Sunyaev-Zeldovich effect-cosmic infrared background correlation
journal, September 2016

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: V. The time delay in SDSS J1650+4251
journal, January 2007

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: VIII. Deconvolution of high resolution near-IR images and simple mass models for 7 gravitationally lensed quasars
journal, November 2010

Cosmology at a Crossroads
journal, September 2009

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XII. Time delays of the doubly lensed quasars SDSS J1206+4332 and HS 2209+1914
journal, May 2013

Planck 2015 results : X. Diffuse component separation: Foreground maps
journal, September 2016

Planck 2015 results : XVI. Isotropy and statistics of the CMB
journal, September 2016

Planck 2015 results : XXVI. The Second
journal, September 2016

H0LiCOW - V. New COSMOGRAIL time delays of HE 0435-1223: H0 to 3.8 per cent precision from strong lensing in a flat ΛCDM model
text, January 2017

VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning
text, January 2017

Dissecting the Gravitational Lens B1608+656. I. Lens Potential Reconstruction
text, January 2008

Ray-tracing through the Millennium Simulation: Born corrections and lens-lens coupling in cosmic shear and galaxy-galaxy lensing
text, January 2008

Dissecting the Gravitational Lens B1608+656. II. Precision Measurements of the Hubble Constant, Spatial Curvature, and the Dark Energy Equation of State
text, January 2009

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses IX. Time delays, lens dynamics and baryonic fraction in HE 0435-1223
text, January 2010

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XIII: Time delays and 9-yr optical monitoring of the lensed quasar RX J1131-1231
text, January 2012

Reconstructing the Lensing Mass in the Universe from Photometric Catalogue Data
text, January 2013

Cosmology from gravitational lens time delays and Planck data
text, January 2013

Planck 2015 results. XIII. Cosmological parameters
text, January 2015

Discovery of two gravitationally lensed quasars in the Dark Energy Survey
text, January 2015

A 2.4% Determination of the Local Value of the Hubble Constant
text, January 2016

H0LiCOW I. $H_0$ Lenses in COSMOGRAIL's Wellspring: Program Overview
text, January 2016

H0LiCOW II. Spectroscopic survey and galaxy-group identification of the strong gravitational lens system HE0435-1223
text, January 2016

H0LiCOW III. Quantifying the effect of mass along the line of sight to the gravitational lens HE 0435-1223 through weighted galaxy counts
text, January 2016

VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning
text, January 2016

Models of the strongly lensed quasar DES J0408-5354
text, January 2017

Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
text, January 2000

COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses I. How to sample the light curves of gravitationally lensed quasars to measure accurate time delays
text, January 2005

A Bayesian analysis of regularised source inversions in gravitational lensing
text, January 2006

Deconvolution with correct sampling
text, January 1997

COSMOGRAIL: the COSmological MOnitoring of GRAvItational lenses. VII. Time delays and the Hubble constant from WFI J2033-4723
text, January 2008

Impact of the 3D source geometry on time-delay measurements of lensed type-Ia supernovae
journal, January 2019

COSMOGRAIL: XVIII. time delays of the quadruply lensed quasar WFI2033−4723⋆
journal, September 2019

The Hubble constant determined through an inverse distance ladder including quasar time delays and Type Ia supernovae
journal, August 2019

Constraining the microlensing effect on time delays with a new time-delay prediction model in H0 measurements
journal, September 2018

The role of multiple images and model priors in measuring H 0 from supernova Refsdal in galaxy cluster MACS J1149.5+2223
journal, November 2018

Gravitationally lensed quasars in Gaia – III. 22 new lensed quasars from Gaia data release 2
journal, December 2018

Is every strong lens model unhappy in its own way? Uniform modelling of a sample of 13 quadruply+ imaged quasars
journal, December 2018

H0LiCOW – IX. Cosmographic analysis of the doubly imaged quasar SDSS 1206+4332 and a new measurement of the Hubble constant
journal, January 2019

Astrometric requirements for strong lensing time-delay cosmography
journal, August 2019

A geometric probe of cosmology – I. Gravitational lensing time delays and quasar reverberation mapping
journal, December 2019

Spectroscopic Confirmation of the Quadruply Lensed Quasar WG0214-2105
journal, December 2018

Measuring the Distances to Quasars at High Redshifts with Strong Lensing
journal, September 2019