Abstract
We discuss the recent BOSS measurement of a rather high bias factor for the
host galaxies/haloes of Damped Lyman-alpha Absorbers (DLAs), in the context of
our previous modelling of the physical properties of DLAs within the
ŁambdaCDM paradigm. Joint modelling of the column density distribution, the
velocity width distribution of associated low ionization metal absorption, and
the bias parameter suggests that DLAs are hosted by galaxies with dark matter
halo masses in the range 10.5 < log Mv < 13, with a rather sharp cutoff at the
lower mass end, corresponding to viral velocities of ~90 km/s. The observed
properties of DLAs appear to suggest very efficient (stellar) feedback in
haloes with masses/virial velocities below the cutoff and a large retained
baryon fraction (> 35%) in haloes above the cutoff.
Users
Please
log in to take part in the discussion (add own reviews or comments).