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13 papers · 2 filters
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…
GALEX Observations of an Energetic Ultraviolet Flare on the dM4e Star GJ 3685A
Richard D. Robinson, Jonathan M. Wheatley, Barry Y. Welsh +23
The Galaxy Evolution Explorer (GALEX) satellite has obtained high time resolution ultraviolet photometry during a large flare on the M4 dwarf star GJ 3685A. Simultaneous NUV (1750…
Stellar Cluster Fiducial Sequences with the Advanced Camera for Surveys
Thomas M. Brown, Henry C. Ferguson, Ed Smith +6
We present color-magnitude diagrams of five Galactic globular clusters and one Galactic open cluster spanning a wide range of metallicity (-2.1 < [Fe/H] < +0.3), as observed in the…
The First Detailed Abundances for M giants in Baade's Window from Infrared Spectroscopy
R. Michael Rich, Livia Origlia
We report the first abundance analysis of 14 M giant stars in the Galactic bulge, based on R=25,000 infrared spectroscopy (1.5-1.8um) using NIRSPEC at the Keck II telescope. Becaus…
The Galex Ultraviolet Variability (GUVV) Catalog
Barry Y. Welsh, Jonathan M. Wheatley, Kenneth Heafield +24
We present Version 1.0 of the NASA Galaxy Evolution Explorer (GALEX) ultraviolet variability catalog (GUVV) that contains information on 84 time-variable and transient sources gain…
HST/WFPC2 Color-Magnitude Diagrams for Globular Clusters in M31
R. M. Rich, C. E. Corsi, C. Cacciari +3
We report new HST/WFPC2 photometry for 10 globular clusters (GC) in M31 observed in F5555W(V) and F814W(I). Additionally we have reanalyzed HST archival data of comparable quality…
The GALEX UV luminosity function of the cluster of galaxies Abell 1367
L. Cortese, A. Boselli, G. Gavazzi +24
We present the GALEX NUV (2310 A) and FUV (1530 A) galaxy luminosity functions of the nearby cluster of galaxies A1367 in the magnitude range -20.3< M_AB < -13.3. The luminosity fu…
Discovery of an extended halo of metal-poor stars in the Andromeda spiral galaxy
Puragra Guhathakurta, James C. Ostheimer, Karoline M. Gilbert +5
Understanding galaxy formation involves look-back and fossil-record studies of distant and nearby galaxies, respectively. Debris trails in our Galaxy's spheroidal halo of old stars…