The VHE γ-Ray View of the FSRQ PKS 1510-089

Zacharias, Michael; Dominis Prester, Dijana; Jankowsky, Felix; Lindfors, Elina; Meyer, Manuel; Mohamed, Mahmoud; Prokoph, Heike; Sanchez, David; Sitarek, Julian; Terzic, Tomislav; Wagner, Stefan; Wierzcholska, Alicja

doi:10.3390/galaxies7010041

Title: The VHE γ-Ray View of the FSRQ PKS 1510-089

Abstract

The flat spectrum radio quasar PKS 1510-089 is a monitored target in many wavelength bands due to its high variability. It was detected as a very-high-energy (VHE) γ-ray emitter with H.E.S.S. in 2009, and has since been a regular target of VHE observations by the imaging Cherenkov observatories H.E.S.S. and MAGIC. Here, we summarize the current state of results focusing on the monitoring effort with H.E.S.S. and the discovery of a particularly strong VHE flare in 2016 with H.E.S.S. and MAGIC. While the source has now been established as a weak, but regular emitter at VHE, no correlation with other energy bands has been established. This is underlined by the 2016 VHE flare, where the detected optical and high-energy γ-ray counterparts evolve differently than the VHE flux.

Authors:

^[1]; Dominis Prester, Dijana ^[2]; Jankowsky, Felix ^[3]; Lindfors, Elina ^[4];

^[5]; Mohamed, Mahmoud ^[3]; Prokoph, Heike ^[6]; Sanchez, David ^[7];

^[8];

^[2]; Wagner, Stefan ^[3];

^[9]

Ruhr Univ., Bochum (Germany); North-West Univ., Potchefstroom (South Africa)
Zagreb Univ,. (Croatia). Ruđer Bošković Inst.
Heidelberg Univ. (Germany)
Univ. of Oulu, Oulun (Finland)
Stanford Univ., CA (United States)
Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany)
Universite Savoie Mont-Blanc, Annecy (France). Laboratoire d’Annecy-le-Vieux de Physique des Particules
Univ. of Lodz (Poland)
Polish Academy of Sciences (PAS), Krakow (Poland)

Publication Date:: Wed Mar 20 00:00:00 EDT 2019

Research Org.:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Org.:: USDOE; German Ministry for Education and Research (BMBF)

Contributing Org.:: H.E.S.S. and MAGIC Collaborations

OSTI Identifier:: 1529496

Grant/Contract Number:: AC02-76SF00515

Resource Type:: Accepted Manuscript

Journal Name:: Galaxies

Additional Journal Information:: Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2075-4434

Publisher:: MDPI

Country of Publication:: United States

Language:: English

Subject:: 79 ASTRONOMY AND ASTROPHYSICS; active galactic nuclei; blazar variability; multi-wavelength; correlation

Citation Formats


                    Zacharias, Michael, Dominis Prester, Dijana, Jankowsky, Felix, Lindfors, Elina, Meyer, Manuel, Mohamed, Mahmoud, Prokoph, Heike, Sanchez, David, Sitarek, Julian, Terzic, Tomislav, Wagner, Stefan, and Wierzcholska, Alicja. The VHE γ-Ray View of the FSRQ PKS 1510-089.  United States: N. p., 2019. 
Web.  doi:10.3390/galaxies7010041.

Copy to clipboard


                    Zacharias, Michael, Dominis Prester, Dijana, Jankowsky, Felix, Lindfors, Elina, Meyer, Manuel, Mohamed, Mahmoud, Prokoph, Heike, Sanchez, David, Sitarek, Julian, Terzic, Tomislav, Wagner, Stefan, & Wierzcholska, Alicja. The VHE γ-Ray View of the FSRQ PKS 1510-089.  United States.  https://doi.org/10.3390/galaxies7010041

Copy to clipboard


                    Zacharias, Michael, Dominis Prester, Dijana, Jankowsky, Felix, Lindfors, Elina, Meyer, Manuel, Mohamed, Mahmoud, Prokoph, Heike, Sanchez, David, Sitarek, Julian, Terzic, Tomislav, Wagner, Stefan, and Wierzcholska, Alicja. Wed .  
"The VHE γ-Ray View of the FSRQ PKS 1510-089".  United States.  https://doi.org/10.3390/galaxies7010041.  https://www.osti.gov/servlets/purl/1529496.

Copy to clipboard


                    
@article{osti_1529496,

  title        = {The VHE γ-Ray View of the FSRQ PKS 1510-089},

  author       = {Zacharias, Michael and Dominis Prester, Dijana and Jankowsky, Felix and Lindfors, Elina and Meyer, Manuel and Mohamed, Mahmoud and Prokoph, Heike and Sanchez, David and Sitarek, Julian and Terzic, Tomislav and Wagner, Stefan and Wierzcholska, Alicja},

  abstractNote = {The flat spectrum radio quasar PKS 1510-089 is a monitored target in many wavelength bands due to its high variability. It was detected as a very-high-energy (VHE) γ-ray emitter with H.E.S.S. in 2009, and has since been a regular target of VHE observations by the imaging Cherenkov observatories H.E.S.S. and MAGIC. Here, we summarize the current state of results focusing on the monitoring effort with H.E.S.S. and the discovery of a particularly strong VHE flare in 2016 with H.E.S.S. and MAGIC. While the source has now been established as a weak, but regular emitter at VHE, no correlation with other energy bands has been established. This is underlined by the 2016 VHE flare, where the detected optical and high-energy γ-ray counterparts evolve differently than the VHE flux.},

  doi          = {10.3390/galaxies7010041},

  journal      = {Galaxies},

  number       = 1,

  volume       = 7,

  place        = {United States},

  year         = {Wed Mar 20 00:00:00 EDT 2019},

  month        = {Wed Mar 20 00:00:00 EDT 2019}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.3390/galaxies7010041

Other availability

Search WorldCat to find libraries that may hold this journal

Figures / Tables:

Figure 1: Nightwise binned fluxes from 2009 to 2016 in the VHE band taken with H.E.S.S. (top panel) and the HE band taken with Fermi-LAT (bottom panel). The inset shows a zoom in on VHE fluxes without the 2016 flare. The blue dash-dotted line marks the average flux, while themore »

All figures and tables (8 total)

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

H.E.S.S. discovery of VHE γ -rays from the quasar PKS 1510−089
journal, June 2013

Abramowski, A.; Acero, F.; Aharonian, F.
Astronomy & Astrophysics, Vol. 554
DOI: 10.1051/0004-6361/201321135

ATOM - an Automatic Telescope for Optical Monitoring
journal, October 2004

Hauser, M.; Möllenhoff, C.; Pühlhofer, G.
Astronomische Nachrichten, Vol. 325, Issue 6-8
DOI: 10.1002/asna.200410305

Detection of persistent VHE gamma-ray emission from PKS 1510–089 by the MAGIC telescopes during low states between 2012 and 2017
journal, November 2018

Acciari, V. A.; Ansoldi, S.; Antonelli, L. A.
Astronomy & Astrophysics, Vol. 619
DOI: 10.1051/0004-6361/201833618

Fermi: Monitoring the Gamma-Ray Universe
journal, November 2018

Thompson, David
Galaxies, Vol. 6, Issue 4
DOI: 10.3390/galaxies6040117

Magic Discovery of very high Energy Emission from the fsrq pks 1222+21
journal, February 2011

Aleksić, J.; Antonelli, L. A.; Antoranz, P.
The Astrophysical Journal, Vol. 730, Issue 1
DOI: 10.1088/2041-8205/730/1/L8

The 6dF Galaxy Survey: final redshift release (DR3) and southern large-scale structures
journal, October 2009

Jones, D. Heath; Read, Mike A.; Saunders, Will
Monthly Notices of the Royal Astronomical Society, Vol. 399, Issue 2
DOI: 10.1111/j.1365-2966.2009.15338.x

Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
journal, June 2008

Albert, J.; Aliu, E.; Anderhub, H.
Science, Vol. 320, Issue 5884
DOI: 10.1126/science.1157087

VERY HIGH ENERGY γ -RAYS FROM THE UNIVERSE’S MIDDLE AGE: DETECTION OF THE z = 0.940 BLAZAR PKS 1441+25 WITH MAGIC
journal, December 2015

Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
The Astrophysical Journal, Vol. 815, Issue 2
DOI: 10.1088/2041-8205/815/2/L23

X‐Ray Spectral Variability and Rapid Variability of the Soft X‐Ray Spectrum Seyfert 1 Galaxies Arakelian 564 and Ton S180
journal, April 2002

Edelson, Rick; Turner, T. J.; Pounds, Ken
The Astrophysical Journal, Vol. 568, Issue 2
DOI: 10.1086/323779

Intraday Variability in Quasars and BL LAC Objects
journal, September 1995

Wagner, S. J.; Witzel, A.
Annual Review of Astronomy and Astrophysics, Vol. 33, Issue 1
DOI: 10.1146/annurev.aa.33.090195.001115

Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes
journal, November 2016

Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
Astronomy & Astrophysics, Vol. 595
DOI: 10.1051/0004-6361/201629461

Extragalactic optical-infrared background radiation, its time evolution and the cosmic photon-photon opacity
journal, June 2008

Franceschini, A.; Rodighiero, G.; Vaccari, M.
Astronomy & Astrophysics, Vol. 487, Issue 3
DOI: 10.1051/0004-6361:200809691

Monitoring the Extragalactic High Energy Sky
journal, January 2019

Lenain, Jean-Philippe
Galaxies, Vol. 7, Issue 1
DOI: 10.3390/galaxies7010009

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510−089 in 2015
journal, July 2017

Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
Astronomy & Astrophysics, Vol. 603
DOI: 10.1051/0004-6361/201629960

The discrete correlation function - A new method for analyzing unevenly sampled variability data
journal, October 1988

Edelson, R. A.; Krolik, J. H.
The Astrophysical Journal, Vol. 333
DOI: 10.1086/166773

Unbiased Long-Term Monitoring at TeV Energies
journal, April 2019

González, María; Dorner, Daniela; Bretz, Thomas
Galaxies, Vol. 7, Issue 2
DOI: 10.3390/galaxies7020051

The Discrete Correlation Function: A New Method for Analyzing Unevenly Sampled Variability Data
journal, January 1989

Edelson, R. A.; Krolik, J. H.
Symposium - International Astronomical Union, Vol. 134
DOI: 10.1017/s007418090014046x

MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
text, January 2011

Aleksic, J.; Antonelli, L. -A.; Antoranz, P.
Institute of Physics
DOI: 10.17877/de290r-3274

Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes
text, January 2016

Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
Deutsches Elektronen-Synchrotron, DESY, Hamburg
DOI: 10.3204/pubdb-2016-06251

Detection of persistent VHE gamma-ray emission from PKS 1510-089 by the MAGIC telescopes during low states between 2012 and 2017
text, January 2018

Acciari, V. A.; Ansoldi, S.; Antonelli, L. A.
Deutsches Elektronen-Synchrotron, DESY, Hamburg
DOI: 10.3204/pubdb-2019-00134

VERY HIGH ENERGY γ-RAYS FROM THE UNIVERSE'S MIDDLE AGE: DETECTION OF THE z = 0.940 BLAZAR PKS 1441+25 WITH MAGIC
collection, January 2015

Ojha, R.; Al., Et
IOP
DOI: 10.13016/m2mave-icsn

Target of Opportunity Observations of Blazars with H.E.S.S.
conference, August 2018

Schüssler, Fabian; Seglar-Arroyo, Monica; Arrieta, Maialen
Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)
DOI: 10.22323/1.301.0652

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510-089 in 2015
text, January 2016

Collaboration, Magic; Ahnen, M. L.; Ansoldi, S.
Deutsches Elektronen-Synchrotron, DESY, Hamburg
DOI: 10.3204/pubdb-2016-06249

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510−089 in 2015
text, January 2017

Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.
Deutsches Elektronen-Synchrotron, DESY, Hamburg
DOI: 10.3204/pubdb-2018-00435

H.E.S.S. discovery of VHE γ -rays from the quasar PKS 1510−089
text, January 2013

Abramowski, A.; Acero, F.; Aharonian, F.
Deutsches Elektronen-Synchrotron, DESY, Hamburg
DOI: 10.3204/desy-2014-00645

The extragalactic optical-infrared background radiations, their time evolution and the cosmic photon-photon opacity
text, January 2008

Franceschini, Alberto; Rodighiero, Giulia; Vaccari, Mattia
arXiv
DOI: 10.48550/arxiv.0805.1841

Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
text, January 2008

Collaboration, Magic; Albert, J.
arXiv
DOI: 10.48550/arxiv.0807.2822

Very-high-energy gamma-rays from the Universe's middle age: detection of the z=0.940 blazar PKS 1441+25 with MAGIC
text, January 2015

Collaboration, Magic; Ahnen, M. L.; Ansoldi, S.
arXiv
DOI: 10.48550/arxiv.1512.04435

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510-089 in 2015
text, January 2016

Collaboration, Magic; Ahnen, M. L.; Ansoldi, S.
arXiv
DOI: 10.48550/arxiv.1610.09416

The Complex VHE And Multiwavelength Flaring Activity Of The FSRQ PKS 1510-089 In May 2015
text, January 2016

Zacharias, Michael; Böttcher, Markus; Chakraborty, Nachiketa
arXiv
DOI: 10.48550/arxiv.1611.02098

Target of Opportunity Observations of Blazars with H.E.S.S
preprint, January 2017

Schüssler, F.; Seglar-Arroyo, M.; Arrieta, M.
arXiv
DOI: 10.48550/arxiv.1708.01083

The Discrete Correlation Function: A New Method for Analyzing Unevenly Sampled Variability Data
journal, January 1989

Edelson, R. A.; Krolik, J. H.
Symposium - International Astronomical Union, Vol. 134
DOI: 10.1017/s007418090014046x

Intraday Variability in Quasars and BL LAC Objects
journal, September 1995

Wagner, S. J.; Witzel, A.
Annual Review of Astronomy and Astrophysics, Vol. 33, Issue 1
DOI: 10.1146/annurev.aa.33.090195.001115

Monitoring of the FSRQ PKS 1510-089 with H.E.S.S
text, January 2017

Zacharias, Michael; Jankowsky, Felix; Mohamed, Mahmoud
arXiv
DOI: 10.48550/arxiv.1708.00623

Works referencing / citing this record:

Ejection of Double Knots from the Radio Core of PKS 1510–089 during the Strong Gamma-Ray Flares in 2015
journal, May 2019

Park, Jongho; Lee, Sang-Sung; Kim, Jae-Young
The Astrophysical Journal, Vol. 877, Issue 2
DOI: 10.3847/1538-4357/ab1b27

Ejection of Double knots from the radio core of PKS 1510--089 during the strong gamma-ray flares in 2015
text, January 2019

Park, Jongho; Lee, Sang-Sung; Kim, Jae-Young
arXiv
DOI: 10.48550/arxiv.1904.11118

Figures / Tables found in this record:

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

Similar Records in DOE PAGES and OSTI.GOV collections:

MAGIC gamma-ray and multi-frequency observations of flat spectrum radio quasar PKS 1510-089 in early 2012

Journal Article Aleksić, J. ; Ansoldi, S. ; Antonelli, L. A. ; ... - Astronomy and Astrophysics

Aims. We report amongst more than fifty blazars detected in very high energy (VHE, E> 100 GeV) γ rays, only three belong to the subclass of flat spectrum radio quasars (FSRQs). The detection of FSRQs in the VHE range is challenging, mainly because of their soft spectra in the GeV-TeV regime. MAGIC observed PKS 1510-089 (z = 0.36) starting 2012 February 3 until April 3 during a high activity state in the high energy (HE, E> 100 MeV) γ-ray band observed by AGILE and Fermi. MAGIC observations result in the detection of a source with significance of 6.0 standard deviationsmore »« less
Cited by 67
https://doi.org/10.1051/0004-6361/201423484

Full Text Available
Radio and γ-ray follow-up of the exceptionally high-activity state of PKS 1510-089 in 2011

Journal Article Orienti, M. ; Koyama, S. ; D'Ammando, F. ; ... - Monthly Notices of the Royal Astronomical Society

In this paper, we investigate the radio and γ-ray variability of the flat spectrum radio quasar PKS 1510-089 in the time range between 2010 November and 2012 January. In this period the source showed an intense activity, with two major γ-ray flares detected in 2011 July and October. During the latter episode both the γ-ray and the radio flux density reached their historical peak. Multiwavelength analysis shows a rotation of about 380° of the optical polarization angle close in time with the rapid and strong γ-ray flare in 2011 July. An enhancement of the optical emission and an increase ofmore »« less
Cited by 42
https://doi.org/10.1093/mnras/sts201

Full Text Available
EVIDENCE FOR TWO LOGNORMAL STATES IN MULTI-WAVELENGTH FLUX VARIATION OF FSRQ PKS 1510-089

Journal Article Kushwaha, Pankaj ; Misra, Ranjeev ; Chandra, Sunil ; ... - Astrophysical Journal Letters

We present a systematic characterization of multi-wavelength emission from blazar PKS 1510-089 using well-sampled data at near-infrared (NIR), optical, X-ray, and γ -ray energies. The resulting flux distributions, except at X-rays, show two distinct lognormal profiles corresponding to a high and a low flux level. The dispersions exhibit energy-dependent behavior except in the LAT γ -ray and optical B-band. During the low level flux states, it is higher toward the peak of the spectral energy distribution, with γ -ray being intrinsically more variable followed by IR and then optical, consistent with mainly being a result of varying bulk Lorentz factor.more »« less
https://doi.org/10.3847/2041-8205/822/1/L13
On the location of the 2009 GeV flares of blazar PKS 1510–089

Journal Article Dotson, Amanda ; Georganopoulos, Markos ; McCann, Kevin ; ... - Astrophysical Journal

Most of the radiated power of blazars is produced at GeV energies via inverse Compton scattering at an unknown distance from the central engine. Possible seed photon sources map to different locations along the jet spanning two orders of magnitude in distance from the black hole, ranging from the broad-line region (BLR, ∼0.1 pc), to the molecular torus (MT, ∼1− few pc), to the very long baseline interferometry (VLBI) radio core zone at ∼10 pc. Here, we apply a diagnostic for identifying the GeV emission zone (GEZ) in blazar PKS 1510–089 using four bright gamma-ray flares detected by Fermi inmore »« less
https://doi.org/10.1088/0004-637X/809/2/164
Long-term Study of the Light Curve of PKS 1510-089 in GeV Energies

Journal Article Prince, Raj ; Gupta, Nayantara ; Majumdar, Pratik - Astrophysical Journal

We have analyzed data from the flat-spectrum radio quasar PKS 1510-089 collected over a period of eight years from 2008 August to 2016 December with the Fermi -LAT. We have identified several flares of this highly variable source, studied their temporal and spectral properties in detail, and compared with previous works on flares of PKS 1510-089. Five major flares and a few subflares or substructures have been identified in our study. The fastest variability time is found to be 1.30 ± 0.18 hr between MJD 55852.063 and 55852.188, where we estimate the minimum size of the emission region to bemore »« less
https://doi.org/10.3847/1538-4357/AA78F4

Similar Records

Title: The VHE γ-Ray View of the FSRQ PKS 1510-089

Abstract

Citation Formats

Figures / Tables:

H.E.S.S. discovery of VHE γ -rays from the quasar PKS 1510−089 journal, June 2013

ATOM - an Automatic Telescope for Optical Monitoring journal, October 2004

Detection of persistent VHE gamma-ray emission from PKS 1510–089 by the MAGIC telescopes during low states between 2012 and 2017 journal, November 2018

Fermi: Monitoring the Gamma-Ray Universe journal, November 2018

Magic Discovery of very high Energy Emission from the fsrq pks 1222+21 journal, February 2011

The 6dF Galaxy Survey: final redshift release (DR3) and southern large-scale structures journal, October 2009

Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe? journal, June 2008

VERY HIGH ENERGY γ -RAYS FROM THE UNIVERSE’S MIDDLE AGE: DETECTION OF THE z = 0.940 BLAZAR PKS 1441+25 WITH MAGIC journal, December 2015

X‐Ray Spectral Variability and Rapid Variability of the Soft X‐Ray Spectrum Seyfert 1 Galaxies Arakelian 564 and Ton S180 journal, April 2002

Intraday Variability in Quasars and BL LAC Objects journal, September 1995

Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes journal, November 2016

Extragalactic optical-infrared background radiation, its time evolution and the cosmic photon-photon opacity journal, June 2008

Monitoring the Extragalactic High Energy Sky journal, January 2019

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510−089 in 2015 journal, July 2017

The discrete correlation function - A new method for analyzing unevenly sampled variability data journal, October 1988

Unbiased Long-Term Monitoring at TeV Energies journal, April 2019

The Discrete Correlation Function: A New Method for Analyzing Unevenly Sampled Variability Data journal, January 1989

MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21 text, January 2011

Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes text, January 2016

Detection of persistent VHE gamma-ray emission from PKS 1510-089 by the MAGIC telescopes during low states between 2012 and 2017 text, January 2018

VERY HIGH ENERGY γ-RAYS FROM THE UNIVERSE'S MIDDLE AGE: DETECTION OF THE z = 0.940 BLAZAR PKS 1441+25 WITH MAGIC collection, January 2015

Target of Opportunity Observations of Blazars with H.E.S.S. conference, August 2018

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510-089 in 2015 text, January 2016

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510−089 in 2015 text, January 2017

H.E.S.S. discovery of VHE γ -rays from the quasar PKS 1510−089 text, January 2013

The extragalactic optical-infrared background radiations, their time evolution and the cosmic photon-photon opacity text, January 2008

Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe? text, January 2008

Very-high-energy gamma-rays from the Universe's middle age: detection of the z=0.940 blazar PKS 1441+25 with MAGIC text, January 2015

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510-089 in 2015 text, January 2016

The Complex VHE And Multiwavelength Flaring Activity Of The FSRQ PKS 1510-089 In May 2015 text, January 2016

Target of Opportunity Observations of Blazars with H.E.S.S preprint, January 2017

The Discrete Correlation Function: A New Method for Analyzing Unevenly Sampled Variability Data journal, January 1989

Intraday Variability in Quasars and BL LAC Objects journal, September 1995

Monitoring of the FSRQ PKS 1510-089 with H.E.S.S text, January 2017

Ejection of Double Knots from the Radio Core of PKS 1510–089 during the Strong Gamma-Ray Flares in 2015 journal, May 2019

Ejection of Double knots from the radio core of PKS 1510--089 during the strong gamma-ray flares in 2015 text, January 2019

H.E.S.S. discovery of VHE γ -rays from the quasar PKS 1510−089
journal, June 2013

ATOM - an Automatic Telescope for Optical Monitoring
journal, October 2004

Detection of persistent VHE gamma-ray emission from PKS 1510–089 by the MAGIC telescopes during low states between 2012 and 2017
journal, November 2018

Fermi: Monitoring the Gamma-Ray Universe
journal, November 2018

Magic Discovery of very high Energy Emission from the fsrq pks 1222+21
journal, February 2011

The 6dF Galaxy Survey: final redshift release (DR3) and southern large-scale structures
journal, October 2009

Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
journal, June 2008

VERY HIGH ENERGY γ -RAYS FROM THE UNIVERSE’S MIDDLE AGE: DETECTION OF THE z = 0.940 BLAZAR PKS 1441+25 WITH MAGIC
journal, December 2015

X‐Ray Spectral Variability and Rapid Variability of the Soft X‐Ray Spectrum Seyfert 1 Galaxies Arakelian 564 and Ton S180
journal, April 2002

Intraday Variability in Quasars and BL LAC Objects
journal, September 1995

Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes
journal, November 2016

Extragalactic optical-infrared background radiation, its time evolution and the cosmic photon-photon opacity
journal, June 2008

Monitoring the Extragalactic High Energy Sky
journal, January 2019

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510−089 in 2015
journal, July 2017

The discrete correlation function - A new method for analyzing unevenly sampled variability data
journal, October 1988

Unbiased Long-Term Monitoring at TeV Energies
journal, April 2019

The Discrete Correlation Function: A New Method for Analyzing Unevenly Sampled Variability Data
journal, January 1989

MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
text, January 2011

Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes
text, January 2016

Detection of persistent VHE gamma-ray emission from PKS 1510-089 by the MAGIC telescopes during low states between 2012 and 2017
text, January 2018

VERY HIGH ENERGY γ-RAYS FROM THE UNIVERSE'S MIDDLE AGE: DETECTION OF THE z = 0.940 BLAZAR PKS 1441+25 WITH MAGIC
collection, January 2015

Target of Opportunity Observations of Blazars with H.E.S.S.
conference, August 2018

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510-089 in 2015
text, January 2016

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510−089 in 2015
text, January 2017

H.E.S.S. discovery of VHE γ -rays from the quasar PKS 1510−089
text, January 2013

The extragalactic optical-infrared background radiations, their time evolution and the cosmic photon-photon opacity
text, January 2008

Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
text, January 2008

Very-high-energy gamma-rays from the Universe's middle age: detection of the z=0.940 blazar PKS 1441+25 with MAGIC
text, January 2015

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510-089 in 2015
text, January 2016

The Complex VHE And Multiwavelength Flaring Activity Of The FSRQ PKS 1510-089 In May 2015
text, January 2016

Target of Opportunity Observations of Blazars with H.E.S.S
preprint, January 2017

The Discrete Correlation Function: A New Method for Analyzing Unevenly Sampled Variability Data
journal, January 1989

Intraday Variability in Quasars and BL LAC Objects
journal, September 1995

Monitoring of the FSRQ PKS 1510-089 with H.E.S.S
text, January 2017

Ejection of Double Knots from the Radio Core of PKS 1510–089 during the Strong Gamma-Ray Flares in 2015
journal, May 2019

Ejection of Double knots from the radio core of PKS 1510--089 during the strong gamma-ray flares in 2015
text, January 2019