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Local Group and Star Cluster Dynamics from HSTPROMO (The Hubble Space Telescope Proper Motion Collaboration)
Roeland P. van der Marel, Jay Anderson, Andrea Bellini +17
The Hubble Space Telescope (HST) has proven to be uniquely suited for the measurement of proper motions (PMs) of stars and galaxies in the nearby Universe. Here we summarize the ma…
A "Light," Centrally-Concentrated Milky Way Halo?
Valery Rashkov, Annalisa Pillepich, Alis J. Deason +4
We discuss a novel approach to "weighing" the Milky Way dark matter halo, one that combines the latest samples of halo stars selected from the Sloan Digital Sky Survey (SDSS) with…
The dark matter halo concentration and stellar initial mass function of a CASSOWARY group
A. J. Deason, M. W. Auger, V. Belokurov +1
We exploit the group environment of the CAmbridge Sloan Survey Of Wide ARcs in the skY (CASSOWARY) z=0.3 lens J2158+0257 to measure the group dynamical mass as a complement to the…
Stellar mass-gap as a probe of halo assembly history and concentration: youth hidden among old fossils
Alis J. Deason, Charlie Conroy, Andrew R. Wetzel +1
We investigate the use of the halo mass-gap statistic --- defined as the logarithmic difference in mass between the host halo and its most massive satellite subhalo --- as a probe…
The Velocity Anisotropy of Distant Milky Way Halo Stars from Hubble Space Telescope Proper Motions
A. J. Deason, R. P. Van der Marel, P. Guhathakurta +2
Based on long baseline (5-7 years) multi-epoch HST/ACS photometry, used previously to measure the proper motion of M31, we present the proper motions (PMs) of 13 main-sequence Milk…