145 citations · 794 across the 15 of their papers we have counts for
7 papers · 1 filter
The Volume Fraction of Ionized Intergalactic Gas at Redshift z=6.5
Sangeeta Malhotra, James Rhoads
The observed number density of Lyman-alpha sources implies a minimum volume of the inter-galactic medium that must be ionized, in order to allow the Lyman-alpha photons to escape a…
Clues to AGN Growth from Optically Variable Objects in the Hubble Ultra Deep Field
S. H. Cohen, R. E. Ryan, A. N. Straughn +9
We present a photometric search for objects with point-source components that are optically variable on timescales of weeks--months in the Hubble Ultra Deep Field (HUDF) to i'(AB)=…
Morphology and evolution of emission line galaxies in the Hubble Ultra Deep Field
N. Pirzkal, C. Xu, I. Ferreras +8
We investigate the properties and evolution of a sample of galaxies selected to have prominent emission lines in low-resolution grism spectra of the Hubble Ultra Deep Field (HUDF).…
The Structure and Star Formation History of Early-Type Galaxies in the UDF/GRAPES Survey
A. Pasquali, I. Ferreras, N. Panagia +9
We present a two-pronged approach to the formation of early-type galaxies, using a sample of 18 galaxies at 0.5 < z < 1 from the HST/ACS Ultra Deep Field and GRAPES surveys: 1) We…
Passively Evolving Early-type Galaxies at 1.4<z<2.5 in the Hubble Ultra Deep Field
E. Daddi, A. Renzini, N. Pirzkal +13
We report on a complete sample of 7 luminous early-type galaxies in the Hubble Ultra Deep Field (UDF) with spectroscopic redshifts between 1.39 and 2.47 and to K<23 AB. Using the B…
An overdensity of galaxies at z=5.9 +/-0.2 in the Ultra Deep Field confirmed using the ACS grism
S. Malhotra, J. E. Rhoads, N. Pirzkal +17
We present grism spectra taken with the Advanced Camera for Surveys to identify 29 red sources with (i'-z') > 0.9 in the Hubble Ultra Deep Field (HUDF). Of these 23 are found to be…