Article (Scientific journals)
TDCOSMO. IV. Hierarchical time-delay cosmography - joint inference of the Hubble constant and galaxy density profiles
Birrer, S.; Shajib, A. J.; Galan, A. et al.
2020In Astronomy and Astrophysics, 643, p. 165
Peer Reviewed verified by ORBi
 

Files


Full Text
2020_AA_643_A165_TDCOSMO_IV_Birrer_et_al.pdf
Publisher postprint (1.76 MB)
Originally published in A&A
Download

Originally published in Astronomy and Astrophysics


All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
gravitational lensing: strong; galaxies: general; galaxies: kinematics and dynamics; distance scale; cosmological parameters; cosmology: observations
Abstract :
[en] The H0LiCOW collaboration inferred via strong gravitational lensing time delays a Hubble constant value of H[SUB]0[/SUB] = 73.3[SUB]-1.8[/SUB][SUP]+1.7[/SUP] km s[SUP]-1[/SUP] Mpc[SUP]-1[/SUP], describing deflector mass density profiles by either a power-law or stars (constant mass-to-light ratio) plus standard dark matter halos. The mass-sheet transform (MST) that leaves the lensing observables unchanged is considered the dominant source of residual uncertainty in H[SUB]0[/SUB]. We quantify any potential effect of the MST with a flexible family of mass models, which directly encodes it, and they are hence maximally degenerate with H[SUB]0[/SUB]. Our calculation is based on a new hierarchical Bayesian approach in which the MST is only constrained by stellar kinematics. The approach is validated on mock lenses, which are generated from hydrodynamic simulations. We first applied the inference to the TDCOSMO sample of seven lenses, six of which are from H0LiCOW, and measured H[SUB]0[/SUB] = 74.5[SUB]-6.1[/SUB][SUP]+5.6[/SUP] km s[SUP]-1[/SUP] Mpc[SUP]-1[/SUP]. Secondly, in order to further constrain the deflector mass density profiles, we added imaging and spectroscopy for a set of 33 strong gravitational lenses from the Sloan Lens ACS (SLACS) sample. For nine of the 33 SLAC lenses, we used resolved kinematics to constrain the stellar anisotropy. From the joint hierarchical analysis of the TDCOSMO+SLACS sample, we measured H[SUB]0[/SUB] = 67.4[SUB]-3.2[/SUB][SUP]+4.1[/SUP] km s[SUP]-1[/SUP] Mpc[SUP]-1[/SUP]. This measurement assumes that the TDCOSMO and SLACS galaxies are drawn from the same parent population. The blind H0LiCOW, TDCOSMO-only and TDCOSMO+SLACS analyses are in mutual statistical agreement. The TDCOSMO+SLACS analysis prefers marginally shallower mass profiles than H0LiCOW or TDCOSMO-only. Without relying on the form of the mass density profile used by H0LiCOW, we achieve a ∼5% measurement of H[SUB]0[/SUB]. While our new hierarchical analysis does not statistically invalidate the mass profile assumptions by H0LiCOW - and thus the H[SUB]0[/SUB] measurement relying on them - it demonstrates the importance of understanding the mass density profile of elliptical galaxies. The uncertainties on H[SUB]0[/SUB] derived in this paper can be reduced by physical or observational priors on the form of the mass profile, or by additional data. <P />The full analysis is available at <A href="https://github.com/TDCOSMO/hierarchy_analysis_2020_public">http://https://github.com/TDCOSMO/hierarchy_analysis_2020_public</A>.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Birrer, S.;  Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University, Stanford, CA, 94305, USA
Shajib, A. J.;  Physics and Astronomy Department, University of California, Los Angeles, CA, 90095, USA
Galan, A.;  Institute of Physics, Laboratory of Astrophysics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290, Versoix, Switzerland
Millon, M.;  Institute of Physics, Laboratory of Astrophysics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290, Versoix, Switzerland
Treu, T.;  Physics and Astronomy Department, University of California, Los Angeles, CA, 90095, USA
Agnello, A.;  University of Copenhagen > Dark
Auger, M.;  Institute of Astrononmy, University of Cambridge, Madingley Road, Cambridge, CB30HA, UK ; Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge, CB30HA, UK
Chen, G. C.-F.;  Physics Dept., University of California, Davis, 1 Shields Ave., Davis, CA, 95616, USA
Christensen, L.;  DARK, Niels-Bohr Institute, Lyngbyvej 2, 2100, Copenhagen, Denmark
Collett, T.;  Institute of Cosmology and Gravitation, University of Portsmouth, Burnaby Rd, Portsmouth, PO1 3FX, UK
Courbin, F.;  Institute of Physics, Laboratory of Astrophysics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290, Versoix, Switzerland
Fassnacht, C. D.;  Physics Dept., University of California, Davis, 1 Shields Ave., Davis, CA, 95616, USA ; Carnegie Visiting Scientist, USA
Koopmans, L. V. E.;  Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV, Groningen, The Netherlands
Marshall, P. J.;  Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University, Stanford, CA, 94305, USA
Park, J.-W.;  Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University, Stanford, CA, 94305, USA
Rusu, C. E.;  National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-0015, Japan
Sluse, Dominique  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Spiniello, C.;  Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, UK ; INAF, Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131, Naples, Italy
Suyu, S. H.;  Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748, Garching, Germany ; Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748, Garching, Germany ; Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), 11F of ASMAB, No.1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan
Wagner-Carena, S.;  Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics, Stanford University, Stanford, CA, 94305, USA
Wong, K. C.;  Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba, 277-8583, Japan
Barnabè, M.;  NSF's National Optical-Infrared Astronomy Research Laboratory, 950 N. Cherry Ave., Tucson, AZ, 85719, USA
Bolton, A. S.;  University of Vienna, Department of Astrophysics, Türkenschanzstr. 17, 1180, Wien, Austria
Czoske, O.;  Physics and Astronomy Department, University of California, Los Angeles, CA, 90095, USA
Ding, X.;  Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL, 60510, USA ; Kavli Institute for Cosmological Physics, Department of Astronomy & Astrophysics, The University of Chicago, Chicago, IL, 60637, USA
Frieman, J. A.;  STAR Institute, Quartier Agora, Allée du six Août, 19c, 4000, Liège, Belgium)
Van de Vyvere, Lyne  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
More authors (17 more) Less
Language :
English
Title :
TDCOSMO. IV. Hierarchical time-delay cosmography - joint inference of the Hubble constant and galaxy density profiles
Publication date :
01 November 2020
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
643
Pages :
A165
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
H2020 - 787886 - COSMICLENS - Cosmology with Strong Gravitational Lensing
Funders :
CE - Commission Européenne [BE]
Available on ORBi :
since 29 November 2020

Statistics


Number of views
63 (4 by ULiège)
Number of downloads
27 (3 by ULiège)

Scopus citations®
 
207
Scopus citations®
without self-citations
159
OpenCitations
 
151

Bibliography


Similar publications



Contact ORBi