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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. II. halo metallicity-luminosity relation
M. Mouhcine, H. C. Ferguson, R. M. Rich +2
Using the Hubble Space Telescope, we have resolved individual red-giant branch stars in the halos of eight nearby spiral galaxies. The fields lie at projected distances between 2 a…
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…
Local Group Dwarf Elliptical Galaxies: I. Mapping the Dynamics of NGC 205 Beyond the Tidal Radius
M. Geha, P. Guhathakurta, R. M. Rich +1
NGC 205 is the nearest example of a dwarf elliptical (dE) galaxy and the prototype of this enigmatic galaxy class. Photometric evidence suggests that NGC 205, a close satellite of…
An Intermediate-Mass Black Hole in the Globular Cluster G1: Improved Significance from New Keck and Hubble Space Telescope Observations
Karl Gebhardt, R. Michael Rich, Luis C. Ho
We present dynamical models for the massive globular cluster G1. The goal is to measure or place a significant upper limit on the mass of any central black hole. Whether or not glo…
Near-Infrared photometry and spectroscopy of NGC 6539 and UKS 1: two intermediate metallicity Bulge Globular Clusters
L. Origlia, E. Valenti, R. M. Rich +1
Using the SofI imager at ESO/NTT and NIRSPEC spectrograph at KeckII, we have obtained J,K images and echelle spectra covering the range 1.5 - 1.8 micron for the intermediate metall…