2009

The Impact of Inhomogeneous Reionization on the Satellite Galaxy Population of the Milky Way

Busha, Michael T., Alvarez, Marcelo A., Wechsler, Risa H. et al.

Understand

We use the publicly available subhalo catalogs from the Via Lactea simulation along with a Gpc-scale N-body simulation to understand the impact of inhomogeneous reionization on the satellite galaxy population of the Milky Way.

The large-volume simulation is combined with a model for reionization that allows us to predict the distribution of reionization times for Milky Way mass halos.
Motivated by this distribution, we identify candidate satellite galaxies in the simulation by requiring that any subhalo must grow above a specified mass threshold before it is reionized; after this time the photoionizing background will suppress both the formation of stars and the accretion of gas.
We show that varying the reionization time over the range expected for Milky Way mass halos can change the number of satellite galaxies by roughly two orders of magnitude.

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