Publications (7)
H-delta in the Integrated Light of Galaxies: What Are We Actually Measuring?
L. C. Prochaska, J. A. Rose, N. Caldwell +5
We present a cautionary study exploring the reliability of the H-delta line in the integrated spectra of galaxies for determining galaxy ages. Our database consists of the observed…
Mapping the Galactic Halo. V. Sgr dSph Tidal Debris 60 degrees from the Main Body
R. C. Dohm-Palmer, A. Helmi, H. Morrison +6
As part of the Spaghetti Project Survey (SPS) we have detected a concentration of giant stars well above expectations for a smooth halo model. The position (l~350, b~50) and distan…
A Star in the M31 Giant Stream: the Highest Negative Stellar Velocity Known
N. Caldwell, H. Morrison, S. J. Kenyon +3
We report on a single star, B030D, observed as part of a large survey of objects in M31, which has the unusual radial velocity of -780 km/s. Based on details of its spectrum, we fi…
Star Clusters in M31: Old Clusters with Bar Kinematics
H. Morrison, N. Caldwell, R. Schiavon +3
We analyze our accurate kinematical data for the old clusters in the inner regions of M31. These velocities are based on high S/N Hectospec data (Caldwell et al 2010). The data are…
Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. I: Method and a Preliminary Measurement for Fornax
S. Piatek, C. Pryor, E. W. Olszewski +6
This article presents and discusses a method for measuring the proper motions of the Galactic dwarf spheroidal galaxies using images taken with the Hubble Space Telescope. The meth…
Mapping the Galactic Halo II: Photometric Survey
R. C. Dohm-Palmer, Mario Mateo, E. Olszewski +4
We present imaging results from a high Galactic latitude survey designed to examine the structure of the Galactic halo. The objective of the survey is to identify candidate halo st…
The radial velocity dispersion profile of the Galactic halo: Constraining the density profile of the dark halo of the Milky Way
G. Battaglia, A. Helmi, H. Morrison +6
We have compiled a new sample of 240 halo objects with accurate distance and radial velocity measurements, including globular clusters, satellite galaxies, field blue horizontal br…