Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545709r&link_type=abstract
American Astronomical Society, AAS Meeting #215, #457.09; Bulletin of the American Astronomical Society, Vol. 42, p.481
Other
Scientific paper
In this poster I revisit the problem of gas accretion onto small mass halos after reionization. Using analytical calculations I confirm the well-known result that small mass halos with maximum circular velocity vmax<20 km/s stop accreting gas from the intergalactic medium soon after reionization. However, I find that the suppression due to reionization is only temporary. Some small mass halos may start accreting gas and possibly form stars at redshift z<1 or 2. This late phase of gas accretion is due to the increasing concentration of dark halos and the decreasing temperature of the intergalactic medium at redshift z<3.
A prediction of this model is that the fossils of the first dwarf galaxies (formed before reionization) have either a single old stellar population or a bimodal star formation history. The dwarf spheroidal galaxy LeoT fits with this scenario. Another prediction of this model is the existence of a population of gas rich minihalos that have never formed stars (i.e., dark galaxies). A subset of compact high-velocity clouds may be identified as such objects but the bulk of them may still be undiscovered.
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