794 citations · 10k across the 110 of their papers we have counts for
4 papers · 2 filters
The Formation History of the Ultra-Faint Dwarf Galaxies
Thomas M. Brown, Jason Tumlinson, Marla Geha +11
We present early results from a Hubble Space Telescope survey of the ultra-faint dwarf galaxies. These Milky Way satellites were discovered in the Sloan Digital Sky Survey, and app…
Segue 2: The Least Massive Galaxy
Evan N. Kirby, Michael Boylan-Kolchin, Judith G. Cohen +3
Segue 2, discovered by Belokurov et al. (2009), is a galaxy with a luminosity of only 900 L_sun. We present Keck/DEIMOS spectroscopy of 25 members of Segue 2--a threefold increase…
The Stellar Initial Mass Function of Ultra-Faint Dwarf Galaxies: Evidence for IMF Variations with Galactic Environment
M. Geha, T. M. Brown, J. Tumlinson +8
We present constraints on the stellar initial mass function (IMF) in two ultra-faint dwarf (UFD) galaxies, Hercules and Leo IV, based on deep HST/ACS imaging. The Hercules and Leo…
The Distribution of Alpha Elements in Ultra-Faint Dwarf Galaxies
Luis C. Vargas, Marla Geha, Evan N. Kirby +1
The Milky Way ultra-faint dwarf galaxies (UFDs) contain some of the oldest, most metal-poor stars in the Universe. We present [Mg/Fe], [Si/Fe], [Ca/Fe], [Ti/Fe], and mean [alpha/Fe…