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Resolving the Stellar Population of the Standard Elliptical Galaxy NGC3379
Michael D. Gregg, Henry C. Ferguson, Dante Minniti +2
Using the Near Infrared Camera and Multi-Object Spectrometer (NICMOS) on board the Hubble Space Telescope, we have obtained F110W (J-band) and F160W (H-band) images of three fields…
Intergalactic HII Regions Discovered in SINGG
E. V. Ryan-Weber, G. R. Meurer, K. C. Freeman +3
A number of very small isolated HII regions have been discovered at projected distances up to 30 kpc from their nearest galaxy. These HII regions appear as tiny emission line objec…
Evolution in the Colors of Lyman-Break Galaxies from Z~4 to Z~3
Casey Papovich, Mark Dickinson, Henry C. Ferguson +11
The integrated colors of distant galaxies provide a means for interpreting the properties of their stellar content. Here, we use rest-frame UV-to-optical colors to constrain the sp…
The Evolution of Early-type Field Galaxies Selected from a NICMOS Map of the Hubble Deep Field North
S. A. Stanford, M. Dickinson, M. Postman +5
The redshift distribution of well-defined samples of distant early-type galaxies offers a means to test the predictions of monolithic and hierarchical galaxy formation scenarios. N…
Intergalactic Globular Clusters
Michael J. West, Patrick Cote, Henry C. Ferguson +5
We confirm and extend our previous detection of a population of intergalactic globular clusters in Abell 1185, and report the first discovery of an intergalactic globular cluster i…
Optimal Galaxy Shape Measurements for Weak Lensing Applications Using the Hubble Space Telescope Advanced Camera for Surveys
Yousin Park, Stefano Casertano, Henry C. Ferguson
We present three-epoch multiband (, , ) measurements of galaxy shapes using the ``polar shapelet'' or Laguerre-expansions method with the Hubble Space Te…
Cosmic Variance in the Great Observatories Origins Deep Survey
Rachel S. Somerville, Kyoungsoo Lee, Henry C. Ferguson +3
Cosmic variance is the uncertainty in observational estimates of the volume density of extragalactic objects such as galaxies or quasars arising from the underlying large-scale den…
Color-selected galaxies at z~6 in the Great Observatories Origins Deep Survey
M. Dickinson, D. Stern, M. Giavalisco +15
We report early results on galaxies at z~6, selected from Hubble Space Telescope imaging for the Great Observatories Origins Deep Survey. Spectroscopy of one object with the Advanc…
The z ~ 4 Lyman Break Galaxies: Colors and Theoretical Predictions
Rafal Idzi, Rachel Somerville, Casey Papovich +4
We investigate several fundamental properties of z ~ 4 Lyman-break galaxies by comparing observations with the predictions of a semi-analytic model based on the Cold Dark Matter th…
Identification of Type Ia Supernovae at Redshift 1.3 and Beyond with the Advanced Camera for Surveys on HST
Adam G. Riess, Louis-Gregory Strolger, John Tonry +15
We present discoveries of SNe Ia at z > 1 and the photometric diagnostic used to discriminate them from other types of SNe detected during the GOODS Hubble Space Telescope Treasury…
The Star-Forming Dwarf Galaxy Populations of two z ~ 0.4 Clusters: MS1512.4+3647 and Abell 851
J. M. Lotz, C. L. Martin, H. C. Ferguson
We present the results of a deep narrow-band [OII] 3727 Åemission-line search for faint ( 27), star-forming galaxies in the field of the MS1512.4+3647 cluster. We fin…
Gravitational Lensing by Burkert Halos
Yousin Park, Henry C. Ferguson
We investigate the gravitational lensing properties of dark matter halos with Burkert profiles. We derive an analytic expression for the lens equation and use it to compute the mag…
Galaxy Threshing and Ultra-Compact Dwarfs in the Fornax Cluster
Michael D. Gregg, Michael J. Drinkwater, Michael J. Hilker +3
We have discovered a new type of galaxy in the Fornax Cluster: ``ultra-compact'' dwarfs (UCDs). The UCDs are unresolved in ground-based imaging and have spectra typical of old stel…
Far-Ultraviolet Emission from Elliptical Galaxies at z=0.33
Thomas M. Brown, Henry C. Ferguson, Ed Smith +4
We present far-ultraviolet (far-UV) images of the rich galaxy cluster ZwCl1358.1+6245, taken with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope (HST)…