Search Publications
Filamentary structures and compact objects in the Aquila and Polaris clouds observed by Herschel
Olofsson, G.; Miville-Deschênes, M. -A.; Abergel, A. +36 more
Our PACS and SPIRE images of the Aquila Rift and part of the Polaris Flare regions, taken during the science demonstration phase of Herschel discovered fascinating, omnipresent filamentary structures that appear to be physically related to compact cores. We briefly describe a new multi-scale, multi-wavelength source extraction method used to detec…
The contribution of high-redshift galaxies to cosmic reionization: new results from deep WFC3 imaging of the Hubble Ultra Deep Field
Bunker, Andrew J.; Stark, Daniel P.; Ellis, Richard S. +6 more
We have searched for star-forming galaxies at z ~ 7-10 by applying the Lyman-break technique to newly released Y-, J- and H-band images (1.1, 1.25 and 1.6µm) from Wide Field Camera 3 (WFC3) on the Hubble Space Telescope. By comparing these images of the Hubble Ultra Deep Field with the Advanced Camera for Surveys (ACS) z'-band (0.85µm)…
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…
Determining global parameters of the oscillations of solar-like stars
García, R. A.; Chaplin, W. J.; Kjeldsen, H. +7 more
Context. Helioseismology has enabled us to better understand the solar interior, while also allowing us to better constrain solar models. But now is a tremendous epoch for asteroseismology as space missions dedicated to studying stellar oscillations have been launched within the last years (MOST and CoRoT). CoRoT has already proved valuable result…
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…
HerMES: SPIRE galaxy number counts at 250, 350, and 500 µm
Altieri, B.; Aussel, H.; Elbaz, D. +75 more
Emission at far-infrared wavelengths makes up a significant fraction of the total light detected from galaxies over the age of Universe. Herschel provides an opportunity for studying galaxies at the peak wavelength of their emission. Our aim is to provide a benchmark for models of galaxy population evolution and to test pre-existing models of gala…
An Empirical Pixel-Based Correction for Imperfect CTE. I. HST’s Advanced Camera for Surveys
Anderson, Jay; Bedin, Luigi R.
We use an empirical approach to characterize the effect of charge-transfer efficiency (CTE) losses in images taken with the Wide-Field Channel of the Advanced Camera for Surveys (ACS). The study is based on profiles of warm pixels in 168 dark exposures taken between 2009 September and October. The dark exposures allow us to explore charge traps th…
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…
Recent Hotspot Volcanism on Venus from VIRTIS Emissivity Data
Drossart, Pierre; Piccioni, Giuseppe; Helbert, Joern +5 more
The questions of whether Venus is geologically active and how the planet has resurfaced over the past billion years have major implications for interior dynamics and climate change. Nine “hotspots”—areas analogous to Hawaii, with volcanism, broad topographic rises, and large positive gravity anomalies suggesting mantle plumes at depth—have been id…