794 citations · 10k across the 110 of their papers we have counts for
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[/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…
The Quenching of the Ultra-Faint Dwarf Galaxies in the Reionization Era
Thomas M. Brown, Jason Tumlinson, Marla Geha +11
We present new constraints on the star formation histories of six ultra-faint dwarf galaxies: Bootes I, Canes Venatici II, Coma Berenices, Hercules, Leo IV, and Ursa Major I. Our a…
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…
Too Big to Fail in the Local Group
Shea Garrison-Kimmel, Michael Boylan-Kolchin, James S. Bullock +1
We compare the dynamical masses of dwarf galaxies in the Local Group (LG) to the predicted masses of halos in the ELVIS suite of CDM simulations, a sample of 48 Galaxy-size host…
Segue 1: An Unevolved Fossil Galaxy from the Early Universe
Anna Frebel, Joshua D. Simon, Evan N. Kirby
We present Magellan/MIKE and Keck/HIRES high-resolution spectra of six red giant stars in the dwarf galaxy Segue 1. Including one additional Segue 1 star observed by Norris et al.…
Detailed Abundance Analysis of the Brightest Star in Segue 2, the Least Massive Galaxy
Ian U. Roederer, Evan N. Kirby
We present the first high resolution spectroscopic observations of one red giant star in the ultra-faint dwarf galaxy Segue 2, which has the lowest total mass (including dark matte…