2013

Dwarf Galaxy Formation with H2-Regulated Star Formation: II. Gas-Rich Dark Galaxies at Redshift 2.5

Kuhlen, Michael, Madau, Piero, Krumholz, Mark

Understand

We present a cosmological hydrodynamic simulation of the formation of dwarf galaxies at redshifts z>~2.5 using a physically-motivated model for H2-regulated star formation.

Our simulation, performed using the Enzo code and reaching a peak resolution of 109 proper parsecs at z=2.5, extends the results of Kuhlen et al.
(2012) to significantly lower redshifts.
We show that a star formation prescription regulated by the local H2 abundance leads to the suppression of star formation in dwarf galaxy halos with M_h <~ 10^10 Msun and to a large population of gas-rich "dark galaxies" at z=2.5 with low star formation efficiencies and gas depletion timescales >20 Gyr.

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