Feedback in Milky Way satellites

Details Feedback in Milky Way satellites Feedback in Milky Way satellites

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21742403g&link_type=abstract

American Astronomical Society, AAS Meeting #217, #424.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We use the "Nut" suite of sub-parsec cosmological hydrodynamic resimulations of a Milky Way (MW) like galaxy at high redshift to investigate the formation of MW satellite galaxies, and determine the effect of supernovae feedback on the dwarf progenitors of these satellites and the efficiency of a simple instantaneous reionisation model in suppressing star formation at the low-mass end of this dwarf distribution. By locating galaxies in our high redshift simulation and tracking them to z=0 using a halo merger tree, we can compare our results to present-day observations and comment on whether satellite galaxy formation is complete at high redshift. We find that only the low-mass end of the population of luminous subhalos of the Milky-Way like galaxy is not complete before redshift 8.5, and that although supernovae feedback reduces the stellar mass of the low-mass subhalos (M≤ 109Msun), the number of surviving satellites around the Milky-Way like galaxy at z = 0 is the same in the run with or without supernova feedback. If a luminous halo is able to avoid accretion by the Milky-Way progenitor before redshift 3, then it is likely to survive as a MW satellite to redshift 0. Finally, we consider a new model for supernova feedback incorporating stellar winds and radiative transfer.

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