HAL : in2p3-00742973, version 1

arXiv : 1210.1213

Code Bibliographique ADS : 2012A&A...547L...1N

DOI : 10.1051/0004-6361/201220259

Fiche détaillée

Récupérer au format BibTeX - EndNote - TEI - RefWorks -

Astronomy and Astrophysics 547 (2012) L1

Column density distribution and cosmological mass density of neutral gas: Sloan Digital Sky Survey-III Data Release 9

P. Noterdaeme, P. Petitjean1, W. C. Carithers, I. Pâris1, A. Font-Ribera, S. Bailey, E. Aubourg2, 3, D. Bizyaev, G. Ebelke, H. Finley, J. Ge, E. Malanushenko, V. Malanushenko, J. Miralda-Escudé, A. D. Myers, D. Oravetz, K. Pan, M. M. Pieri, N. P. Ross, D. P. Schneider, A. Simmons, D. G. York

SDSS-III Collaboration(s)

(10/2012)

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(HI)>=20, out of which 6,839 have log N(HI)>=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(HI) distribution at = 2.5. Contrary to what is generally believed, the distribution extends beyond 10^22 cm^-2 with a moderate slope of index\approx-3.5. This result matches surprisingly well the opacity-corrected distribution observed at z = 0. The cosmological mass density of neutral gas in DLAs is found to be Omega_g_DLA~10^-3, evolving only mildly over the past 12 billion years.

1 :	IAP - Institut d'Astrophysique de Paris
2 :	APC - AstroParticule et Cosmologie
3 :	IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)

équipe(s) de recherche : APC - Cosmologie et Gravitation

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Mot(s)-clé(s) : Astrophysics - Cosmology and Extragalactic Astrophysics

in2p3-00742973, version 1

http://hal.in2p3.fr/in2p3-00742973

oai:hal.in2p3.fr:in2p3-00742973

Contributeur : Eric Aubourg <>

Soumis le : Mercredi 17 Octobre 2012, 17:29:09

Dernière modification le : Lundi 12 Novembre 2012, 17:49:11