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Compatibility of the large quasar groups with the concordance cosmological model

Marinello, Gabriel E. and Clowes, Roger G. and Campusano, Luis E. and Williger, Gerard M. and Söchting, Ilona K. and Graham, Matthew J. (2016) Compatibility of the large quasar groups with the concordance cosmological model. Monthly Notices of the Royal Astronomical Society, 461 (3). pp. 2267-2281. ISSN 0035-8711. doi:10.1093/mnras/stw1513.

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We study the compatibility of large quasar groups with the concordance cosmological model. Large quasar groups are very large spatial associations of quasars in the cosmic web, with sizes of 50–250 h^(−1) Mpc. In particular, the largest large quasar group known, named Huge-LQG, has a longest axis of ∼860 h^(−1) Mpc, larger than the scale of homogeneity (∼260 Mpc), which has been noted as a possible violation of the cosmological principle. Using mock catalogues constructed from the Horizon Run 2 cosmological simulation, we found that large quasar groups size, quasar member number and mean overdensity distributions in the mocks agree with observations. The Huge-LQG is found to be a rare group with a probability of 0.3 per cent of finding a group as large or larger than the observed, but an extreme value analysis shows that it is an expected maximum in the sample volume with a probability of 19 per cent of observing a largest quasar group as large or larger than Huge-LQG. The Huge-LQG is expected to be the largest structure in a volume at least 5.3 ± 1 times larger than the one currently studied.

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Graham, Matthew J.0000-0002-3168-0139
Additional Information:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 June 21. Received 2016 June 6. In original form 2016 February 19. First published online June 26, 2016. We gratefully thank Prof. Juhan Kim for providing the HR2 N-body simulation dark matter halo catalogues employed in this work. Gabriel Marinello gratefully acknowledges the financial support of the University of Central Lancashire. This research has used the SDSS DR7QSO catalogue (Schneider et al. 2010). Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the US Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society and the Higher Education Funding Council for England. The SDSS website is The SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions. The Participating Institutions are the American Museum of Natural History, Astrophysical Institute Potsdam, University of Basel, University of Cambridge, Case Western Reserve University, University of Chicago, Drexel University, Fermilab, the Institute for Advanced Study, the Japan Participation Group, Johns Hopkins University, the Joint Institute for Nuclear Astrophysics, the Kavli Institute for Particle Astrophysics and Cosmology, the Korean Scientist Group, the Chinese Academy of Sciences (LAMOST), Los Alamos National Laboratory, the Max-Planck-Institute for Astronomy (MPIA), the Max-Planck Institute for Astrophysics (MPA), New Mexico State University, Ohio State University, University of Pittsburgh, University of Portsmouth, Princeton University, the United States Naval Observatory and the University of Washington.
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University of Central LancashireUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Japanese MonbukagakushoUNSPECIFIED
Max Planck SocietyUNSPECIFIED
Higher Education Funding Council for EnglandUNSPECIFIED
Subject Keywords:quasars: general cosmology: observations large-scale structure of Universe
Issue or Number:3
Record Number:CaltechAUTHORS:20161017-081353377
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Official Citation:Gabriel E. Marinello, Roger G. Clowes, Luis E. Campusano, Gerard M. Williger, Ilona K. Söchting, and Matthew J. Graham Compatibility of the large quasar groups with the concordance cosmological model MNRAS (September 21, 2016) Vol. 461 2267-2281 doi:10.1093/mnras/stw1513 first published online June 26, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71136
Deposited By: Ruth Sustaita
Deposited On:17 Oct 2016 17:04
Last Modified:11 Nov 2021 04:40

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