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Evidence of Fanning in the Ophiuchus Stream
B. Sesar, A. M. Price-Whelan, J. G. Cohen +11
The Ophiuchus stellar stream presents a dynamical puzzle: its old stellar populations ( Gyr) cannot be reconciled with (1) its orbit in a simple model for the Milky Way po…
Triangulum II: Possibly a Very Dense Ultra-Faint Dwarf Galaxy
Evan N. Kirby, Judith G. Cohen, Joshua D. Simon +1
Laevens et al. recently discovered Triangulum II, a satellite of the Milky Way. Its Galactocentric distance is 36 kpc, and its luminosity is only 450 L_sun. Using Keck/DEIMOS, we m…
The Outer Galactic Halo As Probed By RR Lyr Stars From the Palomar Transient Facility + Keck
Judith G. Cohen, Branimir Sesar, Sophianna Banholzer +1
We present initial results from our study of the outer halo of the Milky Way using a large sample of RR Lyr(ab) variables datamined from the archives of the Palomar Transient Facil…
Spectroscopic Confirmation of the Dwarf Galaxies Hydra II and Pisces II and the Globular Cluster Laevens 1
Evan N. Kirby, Joshua D. Simon, Judith G. Cohen
We present Keck/DEIMOS spectroscopy of stars in the recently discovered Milky Way satellites Hydra II, Pisces II, and Laevens 1. We measured a velocity dispersion of 5.4 (+3.6 -2.4…
Carbon in Red Giants in Globular Clusters and Dwarf Spheroidal Galaxies
Evan N. Kirby, Michelle Guo, Andrew J. Zhang +6
We present carbon abundances of red giants in Milky Way globular clusters and dwarf spheroidal galaxies (dSphs). Our sample includes measurements of carbon abundances for 154 giant…
The Nature and Orbit of the Ophiuchus Stream
B. Sesar, J. Bovy, E. J. Bernard +20
The Ophiuchus stream is a recently discovered stellar tidal stream in the Milky Way. We present high-quality spectroscopic data for 14 stream member stars obtained using the Keck a…