Search Publications
Missions
Journals
Publication Years
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…
The Saturnian satellite Rhea as seen by Cassini VIMS
Baines, Kevin H.; Buratti, Bonnie J.; Clark, Roger N. +16 more
Since the arrival of the Cassini spacecraft at Saturn in June 2004, the Visual and Infrared Mapping Spectrometer has obtained new spectral data of the icy satellites of Saturn in the spectral range from 0.35 to 5.2 µm. Numerous flybys were performed at Saturn’s second largest satellite Rhea, providing a nearly complete coverage with pixel-gr…
Magnetic Fields of an Active Region Filament from Full Stokes Analysis of Si I 1082.7 nm and He I 1083.0 nm
Liu, Y.; Lagg, A.; Solanki, S. +1 more
Vector magnetic fields of an active region filament in the photosphere and upper chromosphere are obtained from spectro-polarimetric observations recorded with the Tenerife Infrared Polarimeter (TIP II) at the German Vacuum Tower Telescope. We apply Milne-Eddington inversions on full Stokes vectors of the photospheric Si I 1082.7 nm and the upper …
The nature of the unresolved extragalactic cosmic soft X-ray background
Finoguenov, A.; Vignali, C.; Gilli, R. +12 more
In this paper we investigate the power spectrum of the unresolved 0.5-2 keV cosmic X-ray background (CXB) with deep Chandra 4-Msec (Ms) observations in the Chandra Deep Field South (CDFS). We measured a signal that, on scales >30 arcsec, is significantly higher than the shot noise and is increasing with angular scale. We interpreted this signal…
Charge-exchange X-ray emission of nearby star-forming galaxies
Wang, Q. Daniel; Liu, Jiren; Mao, Shude
Properties of hot gas outflows from galaxies are generally measured from associated X-ray line emission assuming that it represents atomic transitions in thermally excited hot gas. X-ray line emission, however, can also arise from the charge exchange between highly ionized ions and neutral species. The Kα triplet of He-like ions can be used as a p…
Measuring Microlensing Using Spectra of Multiply Lensed Quasars
Muñoz, J. A.; Mediavilla, E.; Motta, V. +1 more
We report on a program of spectroscopic observations of gravitationally lensed QSOs with multiple images. We seek to establish whether microlensing is occurring in each QSO image using only single-epoch observations. We calculate flux ratios for the cores of emission lines in image pairs to set a baseline for no microlensing. The offset of the con…