Search Publications
Star Formation Rates and Stellar Masses of z = 7-8 Galaxies from IRAC Observations of the WFC3/IR Early Release Science and the HUDF Fields
Trenti, M.; Oesch, P. A.; Carollo, C. M. +9 more
We investigate the Spitzer/IRAC properties of 36 z ~ 7 z 850-dropout galaxies and three z ~ 8 Y 098 galaxies derived from deep/wide-area WFC3/IR data of the Early Release Science, the ultradeep HUDF09, and wide-area NICMOS data. We fit stellar population synthesis models to the spectral energy distributions to derive mean red…
The Persistence of Cool Galactic Winds in High Stellar Mass Galaxies between z ~ 1.4 and ~1
Weiner, Benjamin J.; Martin, Crystal L.; Prochaska, J. Xavier +4 more
We present an analysis of the Mg II λλ2796, 2803 and Fe II λλ2586, 2600 absorption line profiles in co-added spectra of 468 galaxies at 0.7 < z < 1.5. The galaxy sample, drawn from the Team Keck Treasury Redshift Survey of the GOODS-N field, has a range in stellar mass (M *) comparable to that of the sample at z ~ 1.4 analyzed in …
The Nature of Starbursts. I. The Star Formation Histories of Eighteen Nearby Starburst Dwarf Galaxies
McQuinn, Kristen B. W.; Cannon, John M.; Skillman, Evan D. +7 more
We use archival Hubble Space Telescope observations of resolved stellar populations to derive the star formation histories (SFHs) of 18 nearby starburst dwarf galaxies. In this first paper, we present the observations, color-magnitude diagrams (CMDs), and the SFHs of the 18 starburst galaxies, based on a homogeneous approach to the data reduction,…
Spectral Evolution of the Extraordinary Type IIn Supernova 2006gy
Filippenko, Alexei V.; Foley, Ryan J.; Smith, Nathan +2 more
We present a detailed analysis of the extremely luminous and long-lasting Type IIn supernova (SN) 2006gy using spectra obtained between days 36 and 237 after explosion. We derive the temporal evolution of the effective temperature, radius, blast-wave and SN-ejecta expansion speeds, and bolometric luminosity, as well as the progenitor wind density …
The Rise and Fall of Passive Disk Galaxies: Morphological Evolution Along the Red Sequence Revealed by COSMOS
Koekemoer, Anton M.; Scarlata, Claudia; Ma, Chung-Pei +13 more
The increasing abundance of passive "red-sequence" galaxies since z ~ 1-2 is mirrored by a coincident rise in the number of galaxies with spheroidal morphologies. In this paper, however, we show in detail, that, the correspondence between galaxy morphology and color is not perfect, providing insight into the physical origin of this evolution. Usin…
On the Origin of the Extended Hα Filaments in Cooling Flow Clusters
Veilleux, Sylvain; Rupke, David S. N.; Mushotzky, Richard +1 more
We present a high spatial resolution Hα survey of 23 cooling flow clusters using the Maryland Magellan Tunable Filter, covering 1-2 orders of magnitude in cooling rate, dM/dt, temperature, and entropy. We find that 8/23 (35%) of our clusters have complex, filamentary morphologies at Hα, while an additional 7/23 (30%) have marginally extended or nu…
The Galaxy Luminosity Function During the Reionization Epoch
Shull, J. M.; Trenti, M.; Carollo, C. M. +5 more
The new Wide Field Camera 3/IR observations on the Hubble Ultra-Deep Field (HUDF) started investigating the properties of galaxies during the reionization epoch. To interpret these observations, we present a novel approach inspired by the conditional luminosity function method. We calibrate our model to observations at z = 6 and assume a non-evolv…
Lyα-emitting Galaxies at z = 2.1 in ECDF-S: Building Blocks of Typical Present-day Galaxies?
Blanc, Guillermo A.; Gronwall, Caryl; Gawiser, Eric +8 more
We discovered a sample of 250 Lyα emitting (LAE) galaxies at z ~= 2.1 in an ultra-deep 3727 Å narrow-band MUSYC image of the Extended Chandra Deep Field-South. The LAEs were selected to have rest-frame equivalent widths (EWs) >20 Å and emission-line fluxes F Lyα>2.0 × 10-17 erg cm-2 s-1, after care…
Relativistic Lines and Reflection from the Inner Accretion Disks Around Neutron Stars
Miller, Jon M.; Cackett, Edward M.; Wijnands, Rudy +6 more
A number of neutron star low-mass X-ray binaries (LMXBs) have recently been discovered to show broad, asymmetric Fe K emission lines in their X-ray spectra. These lines are generally thought to be the most prominent part of a reflection spectrum, originating in the inner part of the accretion disk where strong relativistic effects can broaden emis…
Bulges of Nearby Galaxies with Spitzer: Scaling Relations in Pseudobulges and Classical Bulges
Drory, Niv; Fisher, David B.
We investigate scaling relations of bulges using bulge-disk decompositions at 3.6 µm and present bulge classifications for 173 E-Sd galaxies within 20 Mpc. Pseudobulges and classical bulges are identified using Sérsic index, Hubble Space Telescope morphology, and star formation activity (traced by 8 µm emission). In the near-IR pseudob…