Bibcode
Rakic, Olivera; Schaye, Joop; Steidel, Charles C.; Booth, C. M.; Dalla Vecchia, C.; Rudie, Gwen C.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 433, Issue 4, p.3103-3114
Fecha de publicación:
8
2013
Número de citas
32
Número de citas referidas
31
Descripción
We measure the dark matter halo masses of ≈ 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.