Search Publications
A Spectroscopic Catalog of 10 Distant Rich Clusters of Galaxies
Smail, Ian; Ellis, Richard S.; Dressler, Alan +4 more
We present spectroscopic observations of galaxies in the fields of 10 distant clusters for which we have previously presented deep imaging with WFPC2 on board the Hubble Space Telescope. The clusters span the redshift range z=0.37-0.56 and are the subject of a detailed ground- and space-based study to investigate the evolution of galaxies as a fun…
A Comprehensive Spectral and Variability Study of Narrow-Line Seyfert 1 Galaxies Observed by ASCA. II. Spectral Analysis and Correlations
Leighly, Karen M.
I present a comprehensive and uniform analysis of 25 ASCA observations from 23 narrow-line Seyfert 1 galaxies (NLS1s). The spectral analysis and correlations are presented in this paper; the reduction and time series analysis are presented in the companion paper. A maximum likelihood analysis confirms that the hard X-ray photon index is significan…
Hubble Space Telescope Snapshot Survey of 3CR Radio Source Counterparts. III. Radio Galaxies with z<0.1
Baum, Stefi A.; McCarthy, Patrick J.; Sparks, William B. +7 more
We present and describe optical counterparts to 46 3CR radio galaxies of redshifts less than 0.1 that were imaged with the Hubble Space Telescope's (HST) WFPC2 camera through the broadband F702W filter as part of the 3CR Snapshot Survey. This is the fifth and last such paper describing the 252 radio galaxies of this R-band survey. At the 0.1" reso…
The Diffuse Interstellar Clouds toward 23 Orionis
York, Donald G.; Lauroesch, James T.; Welty, Daniel E. +3 more
Spectra obtained with the Hubble Space Telescope Goddard High Resolution Spectrograph are combined with high-resolution optical spectra and UV spectra from Copernicus to study the abundances and physical conditions in the diffuse interstellar clouds seen along the line of sight to the star 23 Ori. Multiple absorption components are present for eac…
The Population of Weak Mg II Absorbers. I. A Survey of 26 QSO HIRES/Keck Spectra
Vogt, Steven S.; Charlton, Jane C.; Churchill, Christopher W. +1 more
We present a search for ``weak'' Mg II absorbers [those with Wr(2796)<0.3 Å] in the HIRES/Keck spectra of 26 QSOs. We found 30, of which 23 are newly discovered. The spectra are 80% complete to Wr(2796)=0.02 Å and have a cumulative redshift path of ~17.2 for the redshift range 0.4<=z<=1.4. The number of absorbers per…
The NICMOS Snapshot Survey of Nearby Galaxies
Colina, L.; Nota, A.; Calzetti, D. +19 more
We present ``snapshot'' observations with the Near-Infrared Camera and Multi-Object Spectrometer (NICMOS) on board the Hubble Space Telescope (HST) of 94 nearby galaxies from the Revised Shapley Ames Catalog. Images with 0.2" resolution were obtained in two filters, a broadband continuum filter (F160W, roughly equivalent to the H band) and a narro…
Star Clusters in M33. I. Detection, Morphology, and Photometry
Chandar, Rupali; Bianchi, Luciana; Ford, Holland C.
In this paper we present the discovery of 60 star clusters in 20 multiband Hubble Space Telescope (HST) WFPC2 fields in M33. The fields sample a variety of environments, from outer regions to spiral arms and central regions, as well as a range of galactocentric distances. The HST spatial resolution allowed us to penetrate the crowded, spiral arm r…
Galaxy Structural Parameters: Star Formation Rate and Evolution with Redshift
Takamiya, M.
The evolution of the structure of galaxies as a function of redshift is investigated using two parameters: the metric radius of the galaxy (Rη) and the power at high spatial frequencies in the disk of the galaxy (χ). A direct comparison is made between nearby (z~0) and distant (0.2<~z<~1) galaxies by following a fixed range in res…
The ULYSSES Supplement to the BATSE 3B Catalog of Cosmic Gamma-Ray Bursts
Cline, T.; Hurley, K.; Kouveliotou, C. +5 more
We present interplanetary network localization information for 218 gamma-ray bursts in the third BATSE catalog obtained by analyzing the arrival times of these bursts with the Ulysses and Compton Gamma Ray Observatory spacecraft. For any given burst observed by these two spacecraft, arrival time analysis (or ``triangulation'') results in an annulu…
HUBBLE SPACE TELESCOPE Snapshot Survey of 3CR Quasars: The Data
Baum, Stefi A.; McCarthy, Patrick J.; Lehnert, Matthew D. +6 more
We present images taken with the Wide Field Planetary Camera (WFPC-2) on the Hubble Space Telescope (HST) of 43 quasars selected from the 3CR radio catalog. The redshift range of the targets is large--0.3<~z<~2--and allows us to probe the nature of quasar hosts from about 20% to 80% of the age of the universe. These data were taken in the co…