%0 Generic %1 wetzel2015rapid %A Wetzel, Andrew R. %A Tollerud, Erik J. %A Weisz, Daniel R. %D 2015 %K environment quenching satellites %T Rapid Environmental Quenching of Satellite Dwarf Galaxies in the Local Group %U http://arxiv.org/abs/1503.06799 %X In the Local Group, nearly all of the dwarf galaxies (M_star < 10^9 M_sun) that are satellites within 300 kpc (the virial radius) of the Milky Way (MW) and Andromeda (M31) have quiescent star formation and little-to-no cold gas. This contrasts strongly with comparatively isolated dwarf galaxies, which are almost all actively star-forming and gas-rich. This near dichotomy implies a rapid transformation after falling into the halos of the MW or M31. We combine the observed quiescent fractions for satellites of the MW and M31 with the infall times of satellites from the ELVIS suite of cosmological simulations to determine the typical timescales over which environmental processes within the MW/M31 halos remove gas and quench star formation in low-mass satellite galaxies. The quenching timescales for satellites with M_star < 10^8 M_sun are short, < 2 Gyr, and quenching is more rapid at lower M_star. These quenching timescales can be 1 - 2 Gyr longer if environmental preprocessing in lower-mass groups prior to MW/M31 infall is important. We compare with quenching timescales for more massive satellites from previous works and synthesize the nature of satellite quenching across the observable range of M_star = 10^3-11 M_sun. The environmental quenching timescale increases rapidly with satellite M_star, peaking at ~9.5 Gyr for M_star ~ 10^9 M_sun, and rapidly decreases at higher M_star to < 5 Gyr at M_star > 5x10^9 M_sun. Overall, galaxies with M_star ~ 10^9 M_sun, similar to the Magellanic Clouds, exhibit the longest quenching timescales, regardless of environmental or internal mechanisms.

@misc{wetzel2015rapid, abstract = {In the Local Group, nearly all of the dwarf galaxies (M_star < 10^9 M_sun) that are satellites within 300 kpc (the virial radius) of the Milky Way (MW) and Andromeda (M31) have quiescent star formation and little-to-no cold gas. This contrasts strongly with comparatively isolated dwarf galaxies, which are almost all actively star-forming and gas-rich. This near dichotomy implies a rapid transformation after falling into the halos of the MW or M31. We combine the observed quiescent fractions for satellites of the MW and M31 with the infall times of satellites from the ELVIS suite of cosmological simulations to determine the typical timescales over which environmental processes within the MW/M31 halos remove gas and quench star formation in low-mass satellite galaxies. The quenching timescales for satellites with M_star < 10^8 M_sun are short, < 2 Gyr, and quenching is more rapid at lower M_star. These quenching timescales can be 1 - 2 Gyr longer if environmental preprocessing in lower-mass groups prior to MW/M31 infall is important. We compare with quenching timescales for more massive satellites from previous works and synthesize the nature of satellite quenching across the observable range of M_star = 10^{3-11} M_sun. The environmental quenching timescale increases rapidly with satellite M_star, peaking at ~9.5 Gyr for M_star ~ 10^9 M_sun, and rapidly decreases at higher M_star to < 5 Gyr at M_star > 5x10^9 M_sun. Overall, galaxies with M_star ~ 10^9 M_sun, similar to the Magellanic Clouds, exhibit the longest quenching timescales, regardless of environmental or internal mechanisms.}, added-at = {2015-03-25T09:35:25.000+0100}, author = {Wetzel, Andrew R. and Tollerud, Erik J. and Weisz, Daniel R.}, biburl = {https://www.bibsonomy.org/bibtex/2f97d45225fc53c8abc6666b560b441b5/miki}, description = {[1503.06799] Rapid Environmental Quenching of Satellite Dwarf Galaxies in the Local Group}, interhash = {7788712babb65a949e227411c1b59d88}, intrahash = {f97d45225fc53c8abc6666b560b441b5}, keywords = {environment quenching satellites}, note = {cite arxiv:1503.06799Comment: 5 pages, 3 figures. Submitted to ApJ Letters}, timestamp = {2015-03-25T09:35:25.000+0100}, title = {Rapid Environmental Quenching of Satellite Dwarf Galaxies in the Local Group}, url = {http://arxiv.org/abs/1503.06799}, year = 2015 }