Kavli Affiliate: Masahiro Kawasaki
| First 5 Authors: Masataka Fukugita, Masahiro Kawasaki, , ,
| Summary:
We show that the star formation history, the reionization history and the
luminosity function of galaxies are successfully predicted in a simple
gravitational collapse model within the $Lambda$CDM regime to almost a
quantitative accuracy, when the physical conditions, the Jeans criterion and
the cooling process, are taken into account: it predicts that the reionisation
takes place sharply at around redshift $1+zsimeq 7.5$, and the resulting
luminisity function turns off at $L_Bsimeq 10^{10.7}L_odot$, showing the
consistency between the star formation history and reionisation of the
Universe. The total amount of stars is predicted to be
$Omega_mathrm{star}=0.004$ in units of the critical density compared to the
observation $0.0044$ with the recycling factor $1.6$ included. The additional
assumption needed for successful prediction is that the star formation
efficiency is not halo mass independent but becomes maximum at the halo mass
$simeq 10^{12}M_odot$ and is suppressed for both smaller and larger mass
haloes. It is underlied that there are no adjustable parameters other than the
suppression of the star formation rate in the model.
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