5 papers
GHOSTS: The Resolved Stellar Outskirts of Massive Disk Galaxies
Roelof S. de Jong, A. C. Seth, E. F. Bell +10
We show initial results from our ongoing HST GHOSTS survey of the resolved stellar envelopes of 14 nearby, massive disk galaxies. In hierarchical galaxy formation the stellar halos…
Halos of Spiral Galaxies. III. Metallicity Distributions
M. Mouhcine, R. M. Rich, H. C. Ferguson +2
(Abriged) We report results of a campaign to image the stellar populations in the halos of highly inclined spiral galaxies, with the fields roughly 10 kpc (projected) from the nucl…
Halos of Spiral Galaxies. I. The Tip of the Red Giant Branch as a Distance Indicator
M. Mouhcine, H. C. Ferguson, R. M. Rich +2
We have imaged the halo populations of a sample of nearby spiral galaxies using the Wide Field Planetary Camera 2 on broad the Hubble Space Telescope with the aim of studying the s…
Evidence for a Significant Intermediate-Age Population in the M31 Halo from Main Sequence Photometry
Thomas M. Brown, Henry C. Ferguson, Ed Smith +5
We present a color-magnitude diagram (CMD) for a minor-axis field in the halo of the Andromeda galaxy (M31), 51 arcmin (11 kpc) from the nucleus. These observations, taken with the…
Hubble Space Telescope and Ground-Based Optical and Ultraviolet Observations of GRB010222
T. J. Galama, D. Reichart, T. M. Brown +12
We report on Hubble Space Telescope WFPC2 optical and STIS near ultraviolet MAMA observations, and ground-based optical observations of GRB010222, spanning 15 hrs to 71 days. The o…