Article (Scientific journals)
H0LiCOW - III. Quantifying the effect of mass along the line of sight to the gravitational lens HE 0435-1223 through weighted galaxy counts★
Rusu, Cristian E.; Fassnacht, Christopher D.; Sluse, Dominique et al.
2017In Monthly Notices of the Royal Astronomical Society, 467, p. 4220-4242
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Originally published in MNRAS, https://academic.oup.com/mnras/article/467/4/4220/3045396


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Keywords :
gravitational lensing: strong; methods: statistical; quasars: individual: HE 0435-1223; cosmological parameters; distance scale
Abstract :
[en] Based on spectroscopy and multiband wide-field observations of the gravitationally lensed quasar HE 0435-1223, we determine the probability distribution function of the external convergence κ[SUB]ext[/SUB] for this system. We measure the under/overdensity of the line of sight towards the lens system and compare it to the average line of sight throughout the Universe, determined by using the CFHTLenS (The Canada France Hawaii Lensing Survey) as a control field. Aiming to constrain κ[SUB]ext[/SUB] as tightly as possible, we determine under/overdensities using various combinations of relevant informative weighting schemes for the galaxy counts, such as projected distance to the lens, redshift and stellar mass. We then convert the measured under/overdensities into a κ[SUB]ext[/SUB] distribution, using ray-tracing through the Millennium Simulation. We explore several limiting magnitudes and apertures, and account for systematic and statistical uncertainties relevant to the quality of the observational data, which we further test through simulations. Our most robust estimate of κ[SUB]ext[/SUB] has a median value κ^med_ext = 0.004 and a standard deviation σ[SUB]κ[/SUB] = 0.025. The measured σ[SUB]κ[/SUB] corresponds to 2.5 per cent relative uncertainty on the time delay distance, and hence the Hubble constant H[SUB]0[/SUB] inferred from this system. The median κ^med_ext value varies by ˜0.005 with the adopted aperture radius, limiting magnitude and weighting scheme, as long as the latter incorporates galaxy number counts, the projected distance to the main lens and a prior on the external shear obtained from mass modelling. This corresponds to just ˜0.5 per cent systematic impact on H[SUB]0[/SUB]. The availability of a well-constrained κ[SUB]ext[/SUB] makes HE 0435-1223 a valuable system for measuring cosmological parameters using strong gravitational lens time delays.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rusu, Cristian E.;  Department of Physics, University of California, Davis, CA 95616, USA
Fassnacht, Christopher D.;  Department of Physics, University of California, Davis, CA 95616, USA
Sluse, Dominique  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Hilbert, Stefan;  Exzellenzcluster Universe, Boltzmannstr. 2, D-85748 Garching, Germany ; Ludwig-Maximilians-Universität, Universitäts-Sternwarte, Scheinerstr. 1, D-81679 München, Germany
Wong, Kenneth C.;  National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; Institute of Astronomy and Astrophysics, Academia Sinica (ASIAA), PO Box 23-141, Taipei 10617, Taiwan
Huang, Kuang-Han;  Department of Physics, University of California, Davis, CA 95616, USA
Suyu, Sherry H.;  Institute of Astronomy and Astrophysics, Academia Sinica (ASIAA), PO Box 23-141, Taipei 10617, Taiwan ; Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching, Germany ; Physik-Department, Technische Universität München, James-Franck-Straße 1, D-85748 Garching, Germany
Collett, Thomas E.;  Institute of Cosmology and Gravitation, University of Portsmouth, Burnaby Rd, Portsmouth PO1 3FX, UK
Marshall, Philip J.;  Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94035, USA
Treu, Tommaso;  Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1547, USA
Koopmans, Leon V. E.;  Kapteyn Astronomical Institute, University of Groningen, PO Box 800, NL-9700 AV Groningen, The Netherlands)
Language :
English
Title :
H0LiCOW - III. Quantifying the effect of mass along the line of sight to the gravitational lens HE 0435-1223 through weighted galaxy counts★
Publication date :
01 June 2017
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
467
Pages :
4220-4242
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 May 2017

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