232 citations · 956 across the 14 of their papers we have counts for
6 papers · 1 filter
Clean Kinematic Samples in Dwarf Spheroidals: An Algorithm for Evaluating Membership and Estimating Distribution Parameters When Contamination is Present
Matthew G. Walker, Mario Mateo, Edward W. Olszewski +2
(abridged) We develop an algorithm for estimating parameters of a distribution sampled with contamination, employing a statistical technique known as ``expectation maximization'' (…
On the genealogy of the Orphan Stream
L. V. Sales, A. Helmi, E. Starkenburg +6
We use N-body simulations to explore the origin and a plausible orbit for the Orphan Stream, one of the faintest substructures discovered so far in the outer halo of our Galaxy. We…
Internal Kinematics of the Fornax Dwarf Spheroidal Galaxy
Matthew G. Walker, Mario Mateo, Edward W. Olszewski +3
We present new radial velocity results for 176 stars in the Fornax dwarf spheroidal galaxy, of which at least 156 are probable Fornax members. We combine with previously published…
Estimating Dark Matter Distributions
Xiao Wang, Michael Woodroofe, Matthew G. Walker +2
Thanks to instrumental advances, new, very large kinematic datasets for nearby dwarf spheroidal (dSph) galaxies are on the horizon. A key aim of these datasets is to help determine…
Radial Velocity of the Phoenix Dwarf Galaxy: Linking Gas and Hi Gas
C. Gallart, D. Martinez-Delgado, M. A. Gomez-Flechoso +1
We present the first radial velocity measurement of the stellar component of the Local Group dwarf galaxy Phoenix, using FORS1 at the VLT UT1 (ANTU) telescope. From the spectra of…
A WFPC2 Study of the Resolved Stellar Population of the Pegasus Dwarf Irregular Galaxy (DDO 216)
J. S. Gallagher, Eline Tolstoy, Robbie C. Dohm-Palmer +5
The stellar population of the Pegasus dwarf irregular galaxy is investigated in images taken in the F439W (B), F555W (V), and F814W (I) bands with WFPC2. These and ground-based dat…