期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 473, 期 3, 页码 3019-3038出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx2525
关键词
galaxies: intergalactic medium; cosmology: cosmological parameters; cosmology: observations; cosmology: large-scale structure of the Universe
资金
- 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
- 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
- Spanish MINECO [AYA2012-33938, AYA2015-71091-P, MDM-2014-0369]
- STFC Rutherford Fellowship [ST/N003853/1]
- NASA through Einstein Post-doctoral Fellowship Award [PF5-160133]
- STFC [ST/N003853/1] Funding Source: UKRI
We present a measurement of the damped Ly alpha absorber (DLA) mean bias from the cross-correlation of DLAs and the Ly alpha forest, updating earlier results of Font-Ribera et al. (2012) with the final Baryon Oscillations Spectroscopic Survey data release and an improved method to address continuum fitting corrections. Our cross-correlation is well fitted by linear theory with the standard Lambda CDM model, with a DLA bias of b(DLA) = 1.99 +/- 0.11; a more conservative analysis, which removes DLA in the Ly beta forest and uses only the cross-correlation at r > 10 h(-1) Mpc, yields b(DLA) = 2.00 +/- 0.19. This assumes the cosmological model from Planck Collaboration (2016) and the Ly a forest bias factors of Bautista et al. (2017) and includes only statistical errors obtained from bootstrap analysis. The main systematic errors arise from possible impurities and selection effects in the DLA catalogue and from uncertainties in the determination of the Ly alpha forest bias factors and a correction for effects of high column density absorbers. We find no dependence of the DLA bias on column density or redshift. The measured bias value corresponds to a host halo mass similar to 4 x 10(11) h(-1)M(circle dot) if all DLAs were hosted in haloes of a similar mass. In a realistic model where host haloes over a broad mass range have a DLA cross-section Sigma(M-h) proportional to M-h(alpha) down to M-h > M-min = 10(8.5) h(-1)M(circle dot), we find that alpha > 1 is required to have b(DLA) > 1.7, implying a steeper relation or higher value of M-min than is generally predicted in numerical simulations of galaxy formation.
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