Search Publications
A Spitzer-selected Galaxy Cluster at z = 1.62
Finkelstein, S. L.; Papovich, C.; McLure, R. J. +15 more
We report the discovery of a galaxy cluster at z = 1.62 located in the Spitzer Wide-Area Infrared Extragalactic survey XMM-LSS field. This structure was selected solely as an overdensity of galaxies with red Spitzer/Infrared Array Camera colors, satisfying ([3.6] - [4.5])AB> - 0.1 mag. Photometric redshifts derived from the Subaru XM…
Precise Black Hole Masses from Megamaser Disks: Black Hole-Bulge Relations at Low Mass
Greene, Jenny E.; Kim, Minjin; Peng, Chien Y. +7 more
The black hole (BH)-bulge correlations have greatly influenced the last decade of efforts to understand galaxy evolution. Current knowledge of these correlations is limited predominantly to high BH masses (M BHgsim108 M sun) that can be measured using direct stellar, gas, and maser kinematics. These objects, howeve…
Very Blue UV-Continuum Slope β of Low Luminosity z ~ 7 Galaxies from WFC3/IR: Evidence for Extremely Low Metallicities?
Trenti, M.; Oesch, P. A.; Carollo, C. M. +7 more
We use the ultra-deep WFC3/IR data over the Hubble Ultra Deep Field and the Early Release Science WFC3/IR data over the CDF-South GOODS field to quantify the broadband spectral properties of candidate star-forming galaxies at z ~ 7. We determine the UV-continuum slope β in these galaxies, and compare the slopes with galaxies at later times to meas…
Structure and Morphologies of z ~ 7-8 Galaxies from Ultra-deep WFC3/IR Imaging of the Hubble Ultra-deep Field
Trenti, M.; Oesch, P. A.; Carollo, C. M. +6 more
We present a first morphological study of z ~ 7-8 Lyman break galaxies (LBGs) from Oesch et al. and Bouwens et al. detected in ultra-deep near-infrared imaging of the Hubble Ultra-Deep Field (HUDF) by the HUDF09 program. With an average intrinsic size of 0.7 ± 0.3 kpc, these galaxies are found to be extremely compact, having an average observed su…
Hubble Space Telescope Observations of Short Gamma-Ray Burst Host Galaxies: Morphologies, Offsets, and Local Environments
Berger, E.; Fong, W.; Fox, D. B.
We present the first comprehensive analysis of Hubble Space Telescope (HST) observations of short-duration gamma-ray burst (GRB) host galaxies. These observations allow us to characterize the galactic and local environments of short GRBs as a powerful constraint on the nature of their progenitors. Using the HST data for 10 short GRB hosts, we dete…
The Constant Inner-disk Radius of LMC X-3: A Basis for Measuring Black Hole Spin
Steiner, James F.; Remillard, Ronald A.; McClintock, Jeffrey E. +3 more
The black hole binary system LMC X-3 has been observed by virtually every X-ray mission since the inception of X-ray astronomy. Among the persistent sources, LMC X-3 is uniquely both habitually soft and highly variable. Using a fully relativistic accretion disk model, we analyze hundreds of spectra collected during eight X-ray missions that span 2…
New Limits on an Intermediate-Mass Black Hole in Omega Centauri. I. Hubble Space Telescope Photometry and Proper Motions
Anderson, Jay; van der Marel, Roeland P.
We analyze data from the Hubble Space Telescope's (HST) Advanced Camera for Surveys of the globular cluster (GC) Omega Cen. We construct a photometric catalog of 1.2 × 106 stars over a 10' × 10' central field down to below B F435W = 25 (M ~ 0.35 M sun). The 2.5 to 4 year baseline between observations yields a catal…
The Milky Way Tomography with SDSS. III. Stellar Kinematics
Brewington, Howard; Schneider, Donald P.; Majewski, Steven R. +54 more
We study Milky Way kinematics using a sample of 18.8 million main-sequence stars with r < 20 and proper-motion measurements derived from Sloan Digital Sky Survey (SDSS) and POSS astrometry, including ~170,000 stars with radial-velocity measurements from the SDSS spectroscopic survey. Distances to stars are determined using a photometric-paralla…
New Limits on an Intermediate-Mass Black Hole in Omega Centauri. II. Dynamical Models
Anderson, Jay; van der Marel, Roeland P.
We present a detailed dynamical analysis of the projected density and kinematical data available for the globular cluster ω Centauri. We solve the spherical anisotropic Jeans equation for a given density profile to predict the projected profiles of the rms velocity {\bar{σ}}(R), in each of the three orthogonal coordinate directions (line of sight,…
Three-Dimensional Integral Field Observations of 10 Galactic Winds. I. Extended Phase (gsim10 Myr) of Mass/Energy Injection Before the Wind Blows
Sharp, R. G.; Bland-Hawthorn, J.
In recent years, we have come to recognize the widespread importance of large-scale winds in the life cycle of galaxies. The onset and evolution of a galactic wind is a highly complex process which must be understood if we are to understand how energy and metals are recycled throughout the galaxy and beyond. Here we present three-dimensional spect…