Two close large quasar groups of size ∼ 350 Mpc at z ∼ 1.2
Abstract
The Clowes & Campusano large quasar group (LQG) at ¯z = 1.28 has been re-examined using the quasar data from the DR7QSO catalogue of the Sloan Digital Sky Survey. In the 1991 discovery, the LQG impinged on the northern, southern and eastern limits of the survey. In the DR7QSO data, the western, northern and southern boundaries of the LQG remain essentially the same, but an extension eastwards of ∼2◦ is indicated. In the DR7QSO data, the LQG has 34 members, with ¯z = 1.28. A new group of 38 members is indicated at ¯z = 1.11 and within ∼2.◦0 of the Clowes & Campusano LQG. The characteristic sizes of these two LQGs, ∼350–400 Mpc, appear to be only marginally consistent with the scale of homogeneity in the concordance cosmology. In addition to their intrinsic interest, these two LQGs provide locations in which to investigate early large-scale structure in galaxies and to identify high-z clusters. A method is presented for assessing the statistical significance and overdensity of groups found by linkage of points.
Additional Information
© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2011 August 27. Received 2011 August 26; in original form 2011 August 2. Article first published online: 3 Nov 2011. LEC received partial support from Center of Excellence in Astrophysics and Associated Technologies (PFB 06). The many authors of GNU/Linux, R, GGobi and TOPCAT are gratefully acknowledged. 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 http://www.sdss.org/. 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, the University of Basel, the University of Cambridge, Case Western Reserve University, the 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, the University of Pittsburgh, the University of Portsmouth, Princeton University, the United States Naval Observatory and the University of Washington. The anonymous referee is thanked for helpful comments.Attached Files
Published - Clowes2012p17270Mon_Not_R_Astron_Soc.pdf
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Additional details
- Eprint ID
- 29482
- Resolver ID
- CaltechAUTHORS:20120227-094838148
- Center of Excellence in Astrophysics and Associated Technologies
- PFB 06
- Alfred P. Sloan Foundation
- NSF
- Department of Energy (DOE)
- NASA
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- Created
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2012-02-27Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field