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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)=…
Constraining the Distribution of L- & T-Dwarfs in the Galaxy
Russell E. Ryan, Nimish P. Hathi, Seth H. Cohen +1
We estimate the thin disk scale height of the Galactic population of L- & T-dwarfs based on star counts from 15 deep parallel fields from the Hubble Space Telescope. From these obs…
How JWST can measure First Light, Reionization and Galaxy Assembly
R. A. Windhorst, S. H. Cohen, R. A. Jansen +2
We summarize the design and performance of the James Webb Space Telescope that is to be launched to an L2 orbit in 2011, and how it is designed, in particular, to study the epochs…
Hubble Space Telescope Imaging of the Ultracompact Blue Dwarf Galaxy HS 0822+3542: An Assembling Galaxy in a Local Void?
Michael R. Corbin, William D. Vacca, John E. Hibbard +2
We present deep U, narrow-V, and I-band images of the ultracompact blue dwarf galaxy HS 0822+3542, obtained with the Advanced Camera for Surveys / High Resolution Channel of the Hu…
UBVR and HST mid-UV and near-IR surface photometry and radial color gradients of late-type, irregular, and peculiar galaxies
Violet A. Taylor, Rolf A. Jansen, Rogier A. Windhorst +2
We introduce a dataset of 142 mostly late-type spiral, irregular, and peculiar (interacting or merging) nearby galaxies observed in UBVR at the Vatican Advanced Technology Telescop…
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…