Search Publications
The Collimation and Energetics of the Brightest Swift Gamma-ray Bursts
Butler, N. R.; Cenko, S. B.; Price, P. A. +23 more
Long-duration gamma-ray bursts (GRBs) are widely believed to be highly collimated explosions (bipolar conical outflows with half-opening angle θ≈ 1°-10°). As a result of this beaming factor, the true energy release from a GRB is usually several orders of magnitude smaller than the observed isotropic value. Measuring this opening angle, typically i…
The WFC3 Infrared Spectroscopic Parallel (WISP) Survey
Scarlata, C.; Shim, H.; Malkan, M. +12 more
We present the WFC3 Infrared Spectroscopic Parallel (WISP) Survey. WISP is obtaining slitless, near-infrared grism spectroscopy of ~90 independent, high-latitude fields by observing in the pure-parallel mode with the Wide Field Camera Three on the Hubble Space Telescope for a total of ~250 orbits. Spectra are obtained with the G 102 (λ …
Very Large Telescope Kinematics for Omega Centauri: Further Support for a Central Black Hole
Lützgendorf, Nora; Gebhardt, Karl; Kissler-Patig, Markus +4 more
The Galactic globular cluster ω Centauri is a prime candidate for hosting an intermediate-mass black hole. Recent measurements lead to contradictory conclusions on this issue. We use VLT-FLAMES to obtain new integrated spectra for the central region of ω Centauri. We combine these data with existing measurements of the radial velocity dispersion p…
A Runaway Black Hole in COSMOS: Gravitational Wave or Slingshot Recoil?
Finoguenov, A.; Aussel, H.; Sanders, D. B. +38 more
We present a detailed study of a peculiar source detected in the COSMOS survey at z = 0.359. Source CXOC J100043.1+020637, also known as CID-42, has two compact optical sources embedded in the same galaxy. The distance between the two, measured in the HST/ACS image, is 0.495" ± 0.005" that, at the redshift of the source, corresponds to a projected…
NGC 839: Shocks in an M82-like Superwind
Rupke, D. S. N.; Kewley, L. J.; Dopita, M. A. +1 more
We present observations of NGC 839 made with the Wide Field Spectrograph on the ANU 2.3 m telescope. Our data cover a region 25'' × 60'' at a spatial resolution of ~1farcs5. The long axis of the field is aligned with the superwind we have discovered in this starburst galaxy. The data cover the range of 3700-7000 Å, with a spectral resolution R ~70…
Suzaku Observation of A1689: Anisotropic Temperature and Entropy Distributions Associated with the Large-scale Structure
Fukazawa, Yasushi; Nakazawa, Kazuhiro; Ohashi, Takaya +7 more
We present results of new, deep Suzaku X-ray observations (160 ks) of the intracluster medium (ICM) in A1689 out to its virial radius, combined with complementary data sets of the projected galaxy distribution obtained from the SDSS catalog and the projected mass distribution from our recent comprehensive weak and strong lensing analysis of Subaru…
Fading Hard X-ray Emission from the Galactic Center Molecular Cloud Sgr B2
Ponti, G.; Decourchelle, A.; Morris, M. R. +6 more
The center of our Galaxy harbors a four million solar mass black hole that is unusually quiet: its present X-ray luminosity is more than 10 orders of magnitude less than its Eddington luminosity. The observation of iron fluorescence and hard X-ray emission from some of the massive molecular clouds surrounding the Galactic center has been interpret…
Exoplanet Albedo Spectra and Colors as a Function of Planet Phase, Separation, and Metallicity
Fortney, Jonathan J.; Marley, Mark S.; Cahoy, Kerri L.
First generation space-based optical coronagraphic telescopes will obtain images of cool gas- and ice-giant exoplanets around nearby stars. Exoplanets lying at planet-star separations larger than about 1 AU—where an exoplanet can be resolved from its parent star—have spectra that are dominated by reflected light to beyond 1 µm and punctuated…
Formation Epochs, Star Formation Histories, and Sizes of Massive Early-Type Galaxies in Cluster and Field Environments at z = 1.2: Insights from the Rest-Frame Ultraviolet
Ford, H. C.; Demarco, R.; Rosati, P. +7 more
We derive stellar masses, ages, and star formation histories (SFHs) of massive early-type galaxies in the z = 1.237 RDCS1252.9-2927 cluster and compare them with those measured in a similarly mass-selected sample of field contemporaries drawn from the Great Observatories Origin Deep Survey South Field. Robust estimates of these parameters are obta…
The Evolution of the Ultraviolet Luminosity Function from z ~ 0.75 to z ~ 2.5 Using HST ERS WFC3/UVIS Observations
Trenti, M.; Oesch, P. A.; Carollo, C. M. +7 more
We present UV luminosity functions (LFs) at 1500 Å derived from the Hubble Space Telescope Early Release Science WFC3/UVIS data acquired over ~50 arcmin2 of the GOODS-South field. The LFs are determined over the entire redshift range z = 0.75-2.5 using two methods, similar to those used at higher redshifts for Lyman break galaxies (LBGs…