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Two Local Volume Dwarf Galaxies Discovered in 21 cm Emission: Pisces A and B
Erik J. Tollerud, Marla C. Geha, Jana Grcevich +2
We report the discovery of two dwarf galaxies, Pisces A and B, from a blind 21 cm HI search. These were the only two galaxies found via optical imaging and spectroscopy of 22 HI cl…
[/Fe] Abundances of Four Outer M 31 Halo Stars
Luis C. Vargas, Karoline M. Gilbert, Marla C. Geha +3
We present alpha element to iron abundance ratios, [/Fe], for four stars in the outer stellar halo of the Andromeda Galaxy (M 31). The stars were identified as high-likelihood f…
Global Properties of M31's Stellar Halo from the SPLASH Survey: II. Metallicity Profile
Karoline M. Gilbert, Jason S. Kalirai, Puragra Guhathakurta +9
We present the metallicity distribution of red giant branch (RGB) stars in M31's stellar halo, derived from photometric metallicity estimates for over 1500 spectroscopically confir…
The Mass Dependance of Satellite Quenching in Milky Way-like Halos
John I. Phillips, Coral Wheeler, Michael C. Cooper +3
Using the Sloan Digital Sky Survey, we examine the quenching of satellite galaxies around isolated Milky Way-like hosts in the local Universe. We find that the efficiency of satell…
The Distribution of Alpha Elements in Andromeda Dwarf Galaxies
Luis C. Vargas, Marla C. Geha, Erik J. Tollerud
We present alpha to iron abundance ratios for 226 individual red giant branch stars in nine dwarf galaxies of the Andromeda (M 31) satellite system. The abundances are measured fro…
Metallicity Evolution of the Six Most Luminous M31 Dwarf Satellites
N. Ho, M. Geha, E. Tollerud +3
We present global metallicity properties, metallicity distribution functions (MDFs) and radial metallicity profiles for the six most luminous M31 dwarf galaxy satellites: M32, NGC…