TY - JOUR
T1 - The SDSS-DR12 large-scale cross-correlation of damped Lyman alpha systems with the Lyman alpha forest
AU - Pérez-Ràfols, Ignasi
AU - Font-Ribera, Andreu
AU - Miralda-Escudé, Jordi
AU - Blomqvist, Michael
AU - Bird, Simeon
AU - Busca, Nicolás
AU - des Bourboux, Hélion du Mas
AU - Mas-Ribas, Lluís
AU - Noterdaeme, Pasquier
AU - Petitjean, Patrick
AU - Rich, James
AU - Schneider, Donald P.
N1 - Funding Information:
IPR and JME were supported by the Spanish MINECO under projects AYA2012-33938 and AYA2015-71091-P and MDM-2014-0369 of ICCUB (Unidad de Excelencia ‘María de Maeztu’). AFR is supported by a STFC Rutherford Fellowship, grant reference ST/N003853/1. SB was supported by NASA through Einstein Postdoctoral Fellowship Award Number PF5-160133.
Funding Information:
Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the US Department of Energy Office of Science. The SDSS-III web site is http://www.sdss3.org/. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, University of Cambridge, Carnegie Mellon University, University of Florida, the French Participation Group, the German Participation Group, Harvard University, the Instituto de Astrofisica de Canarias, the 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, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington and Yale University. IPR and JME were supported by the Spanish MINECO under projects AYA2012-33938 and AYA2015-71091-P and MDM-2014-0369 of ICCUB (Unidad de Excelencia 'María de Maeztu'). AFR is supported by a STFC Rutherford Fellowship, grant reference ST/N003853/1. SB was supported by NASA through Einstein Postdoctoral Fellowship Award Number PF5-160133.
Funding Information:
Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the US Department of Energy Office of Science. The SDSS-III web site is http://www.sdss3.org/.
Publisher Copyright:
© 2017 The Authors.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - We present a measurement of the damped Ly α absorber (DLA) mean bias from the crosscorrelation of DLAs and the Ly α 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 ΔCDM model, with a DLA bias of bDLA = 1.99 ± 0.11; a more conservative analysis, which removes DLA in the Ly β forest and uses only the cross-correlation at r > 10 h-1 Mpc, yields bDLA = 2.00 ± 0.19. This assumes the cosmological model from Planck Collaboration (2016) and the Ly α 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 α 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 ~4 × 1011 h-1M⊙ 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 Σ(Mh) α Mh α down to Mh > Mmin = 108.5 h-1M⊙, we find that α > 1 is required to have bDLA > 1.7, implying a steeper relation or higher value of Mmin than is generally predicted in numerical simulations of galaxy formation.
AB - We present a measurement of the damped Ly α absorber (DLA) mean bias from the crosscorrelation of DLAs and the Ly α 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 ΔCDM model, with a DLA bias of bDLA = 1.99 ± 0.11; a more conservative analysis, which removes DLA in the Ly β forest and uses only the cross-correlation at r > 10 h-1 Mpc, yields bDLA = 2.00 ± 0.19. This assumes the cosmological model from Planck Collaboration (2016) and the Ly α 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 α 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 ~4 × 1011 h-1M⊙ 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 Σ(Mh) α Mh α down to Mh > Mmin = 108.5 h-1M⊙, we find that α > 1 is required to have bDLA > 1.7, implying a steeper relation or higher value of Mmin than is generally predicted in numerical simulations of galaxy formation.
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U2 - 10.1093/mnras/stx2525
DO - 10.1093/mnras/stx2525
M3 - Article
AN - SCOPUS:85044777456
VL - 473
SP - 3019
EP - 3038
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 3
ER -