期刊
ASTRONOMY & ASTROPHYSICS
卷 547, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201220259
关键词
cosmology: observations; quasars: absorption lines; galaxies: evolution
资金
- Agence Nationale de la Recherche [ANR-08-BLAN-0222]
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy Office of Science
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- University of Cambridge
- Carnegie Mellon University
- University of Florida
- French Participation Group
- German Participation Group
- Harvard University
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- Max Planck Institute for Extraterrestrial Physics
- New Mexico State University
- New York University
- Ohio State University
- Pennsylvania State University
- University of Portsmouth
- Princeton University
- Spanish Participation Group
- University of Tokyo
- University of Utah
- Vanderbilt University
- University of Virginia
- University of Washington
- Yale University
- Agence Nationale de la Recherche (ANR) [ANR-08-BLAN-0222] Funding Source: Agence Nationale de la Recherche (ANR)
We present the first results from an ongoing survey for damped Lyman-alpha systems (DLAs) in the spectra of z > 2 quasars observed in the course of the Baryon Oscillation Spectroscopic Survey (BOSS), which is part of the Sloan Digital Sky Survey (SDSS) III. Our full (non-statistical) sample, based on Data Release 9, comprises 12 081 systems with log N(H I) >= 20, out of which 6839 have log N(H I) >= 20.3. This is the largest DLA sample ever compiled, superseding that from SDSS-II by a factor of seven. Using a statistical sub-sample and estimating systematics from realistic mock data, we probe the N(H I) distribution at < z > = 2.5. Contrary to what is generally believed, the distribution extends beyond 10(22) cm(-2) with a moderate slope of index approximate to-3.5. This result matches the opacity-corrected distribution observed at z = 0 surprisingly well. The cosmological mass density of neutral gas in DLAs is found to be Omega(DLA)(g) approximate to 10(-3), evolving only mildly over the past 12 billion years.
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