1.2k citations · 10.5k across the 105 of their papers we have counts for
5 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'' (…
Stellar Velocities in the Carina, Fornax, Sculptor and Sextans dSph Galaxies: Data from the Magellan/MMFS Survey
Matthew G. Walker, Mario Mateo, Edward Olszewski
We present spectroscopic data for individual stars observed from 2004 March through 2008 August as part of our Michigan/MIKE Fiber System (MMFS) survey of four dwarf spheroidal (dS…
Systemic Proper Motions of Milky Way Satellites from Stellar Redshifts: the Carina, Fornax, Sculptor and Sextans Dwarf Spheroidals
Matthew G. Walker, Mario Mateo, Edward W. Olszewski
The transverse motions of nearby dwarf spheroidal (dSph) galaxies contribute line-of-sight components that increase with angular distance from the dSph centers, inducing detectable…
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…
The structural properties and star formation history of Leo T from deep LBT photometry
J. T. A. de Jong, J. Harris, M. G. Coleman +15
We present deep, wide-field g and r photometry of the transition type dwarf galaxy Leo T, obtained with the blue arm of the Large Binocular Telescope. The data confirm the presence…