Search Publications
Distance to M31 with the Hubble Space Telescope and HIPPARCOS Red Clump Stars
Garnavich, P. M.; Stanek, K. Z.
Following the approach by Paczyński & Stanek, we compare the red clump stars with parallaxes known to better than 10% in the Hipparcos catalog with the red clump stars observed in three fields in M31 using the Hubble Space Telescope. There are ~600 and ~6300 such stars in the two data sets, respectively. The local red clump luminosity function…
The Definitive Abundance of Interstellar Oxygen
Meyer, David M.; Jura, M.; Cardelli, Jason A.
Using the Goddard High Resolution Spectrograph (GHRS) onboard the Hubble Space Telescope, we have obtained high signal-to-noise (S/N) ratio echelle observations of the weak interstellar O I λ1356 absorption toward the stars γ Cas, ɛ Per, δ Ori, ɛ Ori, 15 Mon, τ CMa, and γ Ara. In combination with previous GHRS measurements in six other sight lines…
Infrared Observations of Nebular Emission Lines from Galaxies at Z ~= 3
Dickinson, Mark; Giavalisco, Mauro; Pettini, Max +3 more
We present the first results from a program of near-infrared spectroscopy aimed at studying the familiar rest-frame optical emission lines from the H II regions of Lyman break galaxies at z ~= 3. By targeting redshifts that bring the lines of interest into gaps between the strong OH sky emission, we have been successful in detecting Balmer and [O …
Detailed Mass Map of CL 0024+1654 from Strong Lensing
Tyson, J. Anthony; Kochanski, Greg P.; Dell'Antonio, Ian P.
We construct a high-resolution mass map of the z=0.39 cluster 0024+1654, based on a parametric inversion of the associated gravitational lens. The lens creates eight well-resolved subimages of a background galaxy, seen in deep imaging with the Hubble Space Telescope.1 Excluding mass concentrations centered on visible galaxies, more than 98% of the…
The Age of Globular Clusters in Light of Hipparcos: Resolving the Age Problem?
Chaboyer, Brian; Demarque, P.; Kernan, Peter J. +1 more
We review five independent techniques that are used to set the distance scale to globular clusters, including subdwarf main-sequence fitting utilizing the recent Hipparcos parallax catalog. These data together all indicate that globular clusters are farther away than previously believed, implying a reduction in age estimates. We now adopt a best-f…
The Nature and Evolution of Ultraluminous Infrared Galaxies:A Mid-Infrared Spectroscopic Survey
Lutz, D.; Genzel, R.; Rigopoulou, D. +2 more
We report the first results of a low-resolution mid-infrared spectroscopic survey of an unbiased, far-infrared-selected sample of 60 ultraluminous infrared galaxies (ULIRGs) (LIR>1012 Lsolar) using ISOPHOT-S on board the Infrared Space Observatory (ISO). We use the ratio of the 7.7 µm ``polycyclic aromatic…
The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XIII. The Metallicity Dependence of the Cepheid Distance Scale
Illingworth, Garth D.; Huchra, John P.; Madore, Barry F. +22 more
Uncertainty in the metal-abundance dependence of the Cepheid variable period-luminosity (PL) relation remains one of the outstanding sources of systematic error in the extragalactic distance scale and in the Hubble constant. To test for such a metallicity dependence, we have used the Wide Field Planetary Camera 2 (WFPC2) on the Hubble Space Telesc…
Weak Lensing Analysis of CL 1358+62 Using Hubble Space Telescope Observations
Franx, Marijn; Hoekstra, Henk; Kuijken, Konrad +1 more
We report on the detection of weak gravitational lensing of faint, distant background objects by Cl 1358+62, a rich cluster of galaxies at a redshift of z = 0.33. The observations consist of a large, multicolor mosaic of Hubble Space Telescope WFPC2 images. The number density of approximately 50 background objects arcmin-2 allows us to …
Morphological Studies of the Galaxy Populations in Distant ``Butcher-Oemler'' Clusters with the Hubble Space Telescope. II. AC 103, AC 118, and AC 114 at Z = 0.31
Smail, Ian; Ellis, Richard S.; Barger, Amy J. +2 more
We present new results of a program to study the detailed morphologies of galaxies in intermediate-redshift clusters and hence understand the physical origin of the enhanced star formation seen in these environments at earlier epochs. Deep, high-resolution imagery has been obtained of three rich clusters, AC 103, AC 118, and AC 114 at z = 0.31, th…
Hubble Space Telescope Imaging of the CFRS and LDSS Redshift Surveys. II. Structural Parameters and the Evolution of disk Galaxies to z ~ 11
Tresse, Laurence; Brinchmann, Jarle; Ellis, Richard +10 more
Several aspects of the evolution of star-forming galaxies are studied using measures of the two-dimensional surface brightness profiles extracted from Hubble Space Telescope images of a sample of 341 faint objects selected from the CFRS and LDSS redshift surveys. The galaxies have 0 < z < 1.3. The size function of disk scale lengths in disk-…