Title: TDCOSMO: II. Six new time delays in lensed quasars from high-cadence monitoring at the MPIA 2.2m telescope

Abstract

In this paper we present six new time-delay measurements obtained from $$R_c$$-band monitoring data acquired at the Max Planck Institute for Astrophysics (MPIA) 2.2 m telescope at La Silla observatory between October 2016 and February 2020. The lensed quasars HE 0047–1756, WG 0214–2105, DES 0407–5006, 2M 1134–2103, PSJ 1606–2333, and DES 2325–5229 were observed almost daily at high signal-to-noise ratio to obtain high-quality light curves where we can record fast and small-amplitude variations of the quasars. We measured time delays between all pairs of multiple images with only one or two seasons of monitoring with the exception of the time delays relative to image D of PSJ 1606–2333. The most precise estimate was obtained for the delay between image A and image B of DES 0407–5006, where $$τ_{AB} = –128.4_{–3.8}^{+3.5}$$ d (2.8% precision) including systematics due to extrinsic variability in the light curves. For HE 0047–1756, we combined our high-cadence data with measurements from decade-long light curves from previous COSMOGRAIL campaigns, and reach a precision of 0.9 d on the final measurement. The present work demonstrates the feasibility of measuring time delays in lensed quasars in only one or two seasons, provided high signal-to-noise ratio data are obtained at a cadence close to daily.

Authors:

Millon, M.  ^[1];

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Courbin, F.  ^[1];

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Bonvin, V.  ^[1];

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Buckley-Geer, E. ^[2]; Fassnacht, C. D.  ^[3];

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Frieman, J. ^[2]; Marshall, P. J.  ^[4];

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Suyu, S. H. ^[5]; Treu, T.  ^[6];

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Anguita, T.  ^[7];

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Motta, V.  ^[8];

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Agnello, A.  ^[9];

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Chan, J. H. H. ^[1]; Chao, D. C.-Y. ^[10]; Chijani, M. ^[11]; Gilman, D. ^[6]; Gilmore, K. ^[4]; Lemon, C.  ^[1];

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Lucey, J. R.  ^[12];

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Melo, A. ^[8] more »; Paic, E.  ^[1];

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Rojas, K.  ^[1];

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Sluse, D. ^[13]; Williams, P. R.  ^[6];

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Hempel, A.  ^[14];

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Kim, S.  ^[15];

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Lachaume, R. ^[15]; Rabus, M.  ^[16]

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+ Show Author Affiliations

1. Ecole Polytechnique Federale Lausanne (Switzerland)
2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, IL (United States)
3. Univ. of California, Davis, CA (United States)
4. Stanford Univ., CA (United States)
5. Max Planck Inst. for Astrophysics, Garching (Germany); Technische Univ. München, Garching (Germany); Academia Sinica, Taipei (Taiwan)
6. Univ. of California, Los Angeles, CA (United States)
7. Universidad Andres Bello Fernandez Concha, Santiago (Chile); Millennium Inst. of Astrophysics (Chile)
8. Universidad de Valparaíso (Chile)
9. Univ. of Copenhagen (Denmark)
10. Max Planck Inst. for Astrophysics, Garching (Germany); Technische Univ. München, Garching (Germany)
11. Universidad Andres Bello Fernandez Concha, Santiago (Chile)
12. Durham Univ. (United Kingdom)
13. STAR Inst., Liège (Belgium)
14. Universidad Andres Bello Fernandez Concha, Santiago (Chile); Max-Planck-Institut für Astronomie, Heidelberg (Germany)
15. Pontificia Universidad Católica de Chile, Santiago (Chile); Max-Planck-Institut für Astronomie, Heidelberg (Germany)
16. Las Cumbres Observatory Global Telescope, Goleta, CA (United States); Univ. of California, Santa Barbara, CA (United States)

Publication Date:

Tue Oct 20 00:00:00 EDT 2020

Research Org.:

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), High Energy Physics (HEP); Swiss National Science Foundation (SNF); European Research Council (ERC); European Union’s Horizon 2020; National Science Foundation (NSF); Proyecto Fondecyt N; Ministry for the Economy, Development, and Tourism’s Programa Inicativa Científica Milenio

OSTI Identifier:

1638665

Report Number(s):

FERMILAB-PUB-20-291-AE-SCD; arXiv:2006.10066
Journal ID: ISSN 0004-6361; oai:inspirehep.net:1801907; TRN: US2201801

Grant/Contract Number:  

AC02-07CH11359; 787886; AST-1906976; AST-1907396; 12009

Resource Type:

Accepted Manuscript

Journal Name:

Astronomy and Astrophysics

Additional Journal Information:

Journal Volume: 642; Journal ID: ISSN 0004-6361

Publisher:

EDP Sciences

Country of Publication:

United States

Language:

English

Subject:

79 ASTRONOMY AND ASTROPHYSICS; gravitational lensing: strong; methods: data analysis; cosmological parameters