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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693510.0, MPI für Astronomie / Publikationen_mpia
A measurement of galaxy halo mass from the surrounding H I Lyα absorption
Authors:Rakic, O.; Schaye, J.; Steidel, C. C.; Booth, C. M.; Dalla Vecchia, C.; Rudie, G. C.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:4
Start Page:3103
End Page:3114
Audience:Not Specified
Abstract / Description:We measure the dark matter halo masses of <z> ≈ 2.36 UV colour-selected star-forming galaxies by matching the observed median H I Lyα absorption around them, as observed in the spectra of background QSOs, to the absorption around haloes above a given mass in cosmological simulations. Focusing on transverse separations 0-2 proper Mpc (pMpc) and line-of-sight separations 154-616 km s-1, we find a minimum halo mass of log10Mmin/M = 11.6 ± 0.2, which is in good agreement with published halo mass estimates from clustering analyses. We verified that the measured halo mass is insensitive to a change in the cosmological parameters (Wilkinson Microwave Anisotropy Probe 1 versus Wilkinson Microwave Anisotropy Probe 3) and to the inclusion of strong AGN feedback. One unique strength of this method is that it can be used in narrow field galaxy-QSO surveys, i.e. ≈30 × 30 arcsec. In addition, we find that the observed anisotropy in the 2D H I Lyα absorption distribution on scales of 1.5-2 pMpc is consistent with being a consequence of large-scale gas infall into the potential wells occupied by galaxies.
Free Keywords:galaxies: high-redshift; intergalactic medium; quasars: absorption lines
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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