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GEMS: Galaxy Evolution from Morphologies and SEDs
Bell, Eric F.; Somerville, Rachel S.; Wisotzki, Lutz +13 more
GEMS (Galaxy Evolution from Morphologies and SEDs) is a large-area (800 arcmin2) two-color (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on the Hubble Space Telescope. Centered on the Chandra Deep Field-South, it covers an area of ~28'×28', or about 120 Hubble Deep Field areas, to a depth o…
The ACS Virgo Cluster Survey. I. Introduction to the Survey
Jordán, Andrés; Tonry, John L.; Côté, Patrick +7 more
The Virgo Cluster is the dominant mass concentration in the Local Supercluster and the largest collection of elliptical and lenticular galaxies in the nearby universe. In this paper, we present an introduction to the ACS Virgo Cluster Survey: a program to image, in the F475W and F850LP bandpasses (~Sloan g and z), 100 early-type galaxies in the Vi…
Faint Galaxies in Deep Advanced Camera for Surveys Observations
Infante, L.; Zheng, W.; Feldman, P. D. +33 more
We present the analysis of the faint galaxy population in the Advanced Camera for Surveys (ACS) Early Release Observation fields VV 29 (UGC 10214) and NGC 4676. These observations cover a total area of 26.3 arcmin2 and have depths close to that of the Hubble Deep Fields in the deepest part of the VV 29 image, with 10 σ detection limits …
The Local Lyα Forest. IV. Space Telescope Imaging Spectrograph G140M Spectra and Results on the Distribution and Baryon Content of H I Absorbers
Shull, J. Michael; Stocke, John T.; Penton, Steven V.
We present Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) G140M spectra of 15 extragalactic targets, which we combine with GHRS/G160M data to examine the statistical properties of the low-z Lyα forest. With STIS, we detect 109 Lyα absorbers at significance level (SL) of >=4 σ over 0.002<z<0.069, with a total reds…
Hubble Space Telescope Observations of the White Dwarf Cooling Sequence of M4
Currie, Thayne; Rich, R. Michael; Gibson, Brad K. +7 more
We investigate in detail the white dwarf cooling sequence of the globular cluster Messier 4. In particular, we study the influence of various systematic uncertainties, both observational and theoretical, on the determination of the cluster age from the white dwarf cooling sequence. These include uncertainties in the distance to the cluster and the…
Physical Properties and Baryonic Content of Low-Redshift Intergalactic Lyα and O VI Absorption Line Systems: The PG 1116+215 Sight Line
Richter, Philipp; Tripp, Todd M.; Sembach, Kenneth R. +1 more
We present Hubble Space Telescope and Far Ultraviolet Spectroscopic Explorer observations of the intergalactic absorption toward QSO PG 1116+215 in the 900-3000 Å spectral region. We detect 25 Lyα absorbers along the sight line at rest-frame equivalent widths Wr>30 mÅ, yielding (dN/dz)Lyα=166+/-20 over an unblocked redshif…
GRAPES, Grism Spectroscopy of the Hubble Ultra Deep Field: Description and Data Reduction
Cimatti, A.; Daddi, E.; Panagia, N. +19 more
We present deep unbiased spectroscopy of the Hubble Ultra Deep Field (UDF) carried out using the slitless grism spectroscopy mode of the Advanced Camera for Surveys on the Hubble Space Telescope (HST). The Grism ACS Program for Extragalactic Science (GRAPES) achieves continuum detection as faint as zAB=27.2 using 40 orbits (9.2×104…
Photometric Redshift of X-Ray Sources in the Chandra Deep Field-South
Wolf, C.; Zheng, W.; Gilli, R. +10 more
Based on the photometry of 10 near-ultraviolet, optical, and near-infrared bands of the Chandra Deep Field-South, we estimate the photometric redshifts for 342 X-ray sources, which constitute ~99% of all the detected X-ray sources in the field. The models of spectral energy distribution are based on galaxies and a combination of power-law continuu…
FUSE and STIS Observations of the Warm-hot Intergalactic Medium toward PG 1259+593
Richter, Philipp; Tripp, Todd M.; Sembach, Kenneth R. +1 more
We use Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph (STIS) spectra to study intergalactic absorption toward the quasar PG 1259+593 (zem=0.478), with a particular emphasis on the warm-hot intergalactic medium (WHIM). The combined FUSE and STIS spectrum of PG 1259+593 covers the full wavelength ra…
The ACS Virgo Cluster Survey. II. Data Reduction Procedures
Jordán, Andrés; Tonry, John L.; Côté, Patrick +7 more
The ACS Virgo Cluster Survey is a large program to carry out multicolor imaging of 100 early-type members of the Virgo Cluster using the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. Deep F475W and F850LP images (~SDSS g and z) are being used to study the central regions of the program galaxies, their globular cluster systems, a…