gravitational lensing: micro; distance scale; methods: data analysis; Astrophysics - Cosmology and Nongalactic Astrophysics; Astrophysics - Astrophysics of Galaxies
Abstract :
[en] Time-delay strong lensing provides a unique way to directly measure the Hubble constant (H0). The precision of the H0measurement depends on the uncertainties in the time-delay measurements, the mass distribution of the main deflector(s), and the mass distribution along the line of sight. Tie & Kochanek have proposed a new microlensing effect on time delays based on differential magnification of the coherent accretion disc variability of the lensed quasar. If real, this effect could significantly broaden the uncertainty on the time-delay measurements by up to 30 per cent for lens systems such as PG 1115+080, which have relatively short time delays and monitoring over several different epochs. In this paper we develop a new technique that uses the cosmological time-delay ratios and simulated microlensing maps within a Bayesian framework in order to limit the allowed combinations of microlensing delays and thus to lessen the uncertainties due to the proposed effect. We show that, under the assumption of Tie & Kochanek, the uncertainty on the time-delay distance (D∆t, which is proportional to 1/H0) of the short time-delay (18 d) lens, PG 1115+080, increases from 7 per cent to ̃10 per cent by simultaneously fitting the three time-delay measurements from the three different data sets across 20 yr, while in the case of the long time-delay (̃90 d) lens, the microlensing effect on time delays is negligible as the uncertainty on D[SUB]∆t[/SUB] of RXJ 1131-1231 only increases from ̃2.5 per cent to 2.6 per cent.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Chen, Geoff C.-F.; Department of Physics, University of California, Davis CA 95616, USA
Chan, James H. H.; Institute of Physics, Laboratoire d'Astrophysique, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland
Bonvin, Vivien; Institute of Physics, Laboratoire d'Astrophysique, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland
Fassnacht, Christopher D.; Department of Physics, University of California, Davis CA 95616, USA
Rojas, Karina; Instituto de Física y Astronomía, Universidad de Valparaíso, Avda. Gran Bretaña 1111, Playa Ancha, Valparaíso 2360102, Chile
Millon, Martin; Institute of Physics, Laboratoire d'Astrophysique, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland
Courbin, Fred; Institute of Physics, Laboratoire d'Astrophysique, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, CH-1290 Versoix, Switzerland
Suyu, Sherry H.; Max Planck Institute for Astrophysics, Karl-Schwarzschild-Strasse 1, D-85740 Garching, Germany ; Institute of Astronomy and Astrophysics, Academia Sinica (ASIAA), PO Box 23-141, Taipei 10617, Taiwan ; Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
Wong, Kenneth C.; National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Sluse, Dominique ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Treu, Tommaso; Department of Physics and Astronomy, University of California, Los Angeles CA 90095-1547, USA
Shajib, Anowar J.; Department of Physics and Astronomy, University of California, Los Angeles CA 90095-1547, USA
Hsueh, Jen-Wei; Department of Physics, University of California, Davis CA 95616, USA
Lagattuta, David J.; CRAL, Observatoire de Lyon, Universit Lyon 1, 9 Avenue Ch. Andr, F-69561 Saint Genis Laval Cedex, France
Koopmans, Léon V. E.; Kapteyn Astronomical Institute, University of Groningen, PO Box 800, NL-9700 AV Groningen, the Netherlands
Vegetti, Simona; Max Planck Institute for Astrophysics, Karl-Schwarzschild-Strasse 1, D-85740 Garching, Germany
McKean, John P.; Kapteyn Astronomical Institute, University of Groningen, PO Box 800, NL-9700 AV Groningen, the Netherlands ; Netherlands Institute for Radio Astronomy (ASTRON), PO Box 2, NL-7990 AA Dwingeloo, the Netherlands)
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