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An XMM-Newton Survey of the Soft X-Ray Background. II. An All-Sky Catalog of Diffuse O VII and O VIII Emission Intensities
Henley, David B.; Shelton, Robin L.
We present an all-sky catalog of diffuse O VII and O VIII line intensities, extracted from archival XMM-Newton observations. This catalog supersedes our previous catalog, which covered the sky between l = 120° and l = 240°. We attempted to reduce the contamination from near-Earth solar wind charge exchange (SWCX) emission by excluding times of hig…
Transmission Spectroscopy of Exoplanet XO-2b Observed with Hubble Space Telescope NICMOS
Crouzet, N.; Burke, C.; Long, D. +1 more
Spectroscopy during planetary transits is a powerful tool to probe exoplanet atmospheres. We present the near-infrared transit spectroscopy of XO-2b obtained with Hubble Space Telescope NICMOS. Uniquely for NICMOS transit spectroscopy, a companion star of similar properties to XO-2 is present in the field of view. We derive improved star and plane…
High-resolution Reddening Map in the Direction of the Stellar System Terzan 5
Dalessandro, Emanuele; Mucciarelli, Alessio; Ferraro, Francesco R. +7 more
We have used optical images acquired with the Hubble Space Telescope to construct the first high-resolution extinction map in the direction of Terzan 5, a peculiar stellar system in the inner bulge of our Galaxy. The map has a spatial resolution of 8'' × 8'', over a total field of view of 200'' × 200''. The absorption clouds show a patchy structur…
On the Weak-wind Problem in Massive Stars: X-Ray Spectra Reveal a Massive Hot Wind in µ Columbae
Hamaguchi, Kenji; Huenemoerder, David P.; Ignace, Richard +4 more
µ Columbae is a prototypical weak-wind O star for which we have obtained a high-resolution X-ray spectrum with the Chandra LETG/ACIS instrument and a low-resolution spectrum with Suzaku. This allows us, for the first time, to investigate the role of X-rays on the wind structure in a bona fide weak-wind system and to determine whether there a…
The Size Evolution of Passive Galaxies: Observations from the Wide-Field Camera 3 Early Release Science Program
Holtzman, J. A.; O'Connell, R. W.; Walker, A. R. +28 more
We present the size evolution of passively evolving galaxies at z ~ 2 identified in Wide-Field Camera 3 imaging from the Early Release Science program. Our sample was constructed using an analog to the passive BzK galaxy selection criterion, which isolates galaxies with little or no ongoing star formation at z >~ 1.5. We identify 30 galaxies in…
Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project
de Bruijne, J. H. J.; Eilers, A. -C.
Context. The Hundred-Thousand-Proper-Motion (HTPM) project will determine the proper motions of ~113 500 stars using a ~23-year baseline. The proper motions will be based on space-based measurements exclusively, with the Hipparcos data, with epoch 1991.25, as first epoch and with the first intermediate-release Gaia astrometry, with epoch ~2014.5, …
The nature of the jet-driven outflow in the radio galaxy 3C 305
Bianchi, S.; Hardcastle, M. J.; Siemiginowska, A. +6 more
We present Chandra X-ray and Very Large Array radio observations of the radio galaxy 3C 305. The X-ray observations reveal the details of the previously known extended X-ray halo around the radio galaxy. We show using X-ray spectroscopy that the X-ray emission is consistent with being shock-heated material and can be modelled with standard collisi…
Influence of temperature, composition, and grain size on the tensile failure of water ice: Implications for erosion on Titan
Litwin, Kimberly L.; Zygielbaum, Beth R.; Polito, Peter J. +2 more
Ice resistance to tensile fracture influences surface morphodynamics on outer planetary satellites such as Titan, yet measurements of tensile strength and fracture toughness of polycrystalline water ice at temperatures below terrestrial conditions (<220 K) have not been previously reported. We investigated these parameters from 260 K to 110 K u…
Herschel Observations of Interstellar Chloronium
Menten, Karl M.; Nagy, Zsófia; Neufeld, David A. +21 more
Using the Herschel Space Observatory's Heterodyne Instrument for the Far-Infrared, we have observed para-chloronium (H2Cl+) toward six sources in the Galaxy. We detected interstellar chloronium absorption in foreground molecular clouds along the sight lines to the bright submillimeter continuum sources Sgr A (+50 km s-1<…
Broadband Spectroscopy Using Two Suzaku Observations of the HMXB GX 301-2
Rothschild, Richard E.; Fürst, Felix; Pottschmidt, Katja +5 more
We present the analysis of two Suzaku observations of GX 301-2 at two orbital phases after the periastron passage. Variations in the column density of the line-of-sight absorber are observed, consistent with accretion from a clumpy wind. In addition to a cyclotron resonance scattering feature (CRSF), multiple fluorescence emission lines were detec…