Search Publications
Missions
Journals
Publication Years
Probing Halos of Galaxies at Very Large Radii Using Background QSOs
Freeman, K. C.; Wyse, R. F. G.; Broadhurst, T. +2 more
Gaseous halos of nine nearby galaxies (with redshifts cz<6000 km s-1) were probed at large galactocentric radii using background quasars observed with the Hubble Space Telescope Goddard High Resolution Spectrograph and the Space Telescope Imaging Spectrograph. The projected quasar-galaxy separations range from 55 to 387 h-1
The Initial Mass Function toward the Low-Mass End in the Large Magellanic Cloud with Hubble Space Telescope WFPC2 Observations
Henning, Th.; Brandner, W.; Gouliermis, D.
We present V- and I-equivalent Hubble Space Telescope (HST) WFPC2 photometry of two areas in the Large Magellanic Cloud: the southern part of the stellar association LH 52, located on the western edge of the supershell LMC 4, and a field between two associations, which is located on the southwestern edge of the shell and accounts for the general b…
The advanced Moon micro-imager experiment (AMIE) on SMART-1: Scientific goals and expected results
Langevin, Y.; Koschny, D.; Barucci, M. A. +16 more
The advanced Moon micro-imager experiment (AMIE) is the imaging system on board ESA mission to the Moon SMART-1; it makes use of a miniaturised detector and micro-processor electronics developed by SPACE X in the frame of the ESA technical programme. The AMIE micro-imager will provide high resolution CCD images of selected lunar areas and it will …
Modeling the Shock Aftermath Source of Energetic Particles in the Solar Corona
Vainio, Rami; Kocharov, Leon; Torsti, Jarmo +2 more
Recent observations on board the Solar and Heliospheric Observatory (SOHO) indicate that acceleration of solar energetic particles (SEPs) at intermediate scales in the solar corona, between flare acceleration and interplanetary CME-driven shock acceleration, significantly contributes to the production of >10 MeV protons. Coronal shocks seem to …
The Discovery of Extended Thermal X-Ray Emission from PKS 2152-699: Evidence for a ``Jet-Cloud'' Interaction
Bechtold, Jill; Ly, Chun; De Young, David S.
A Chandra ACIS-S observation of PKS 2152-699 reveals thermal emission from a diffuse region around the core and a hotspot located 10" northeast from the core. This is the first detection of thermal X-ray radiation on kiloparsec scales from an extragalactic radio source. Two other hotspots located 47" north-northeast and 26" southwest from the core…
X-Rays from Hybrid Stars
Ayres, Thomas R.
The late-type giants and supergiants of the ``hybrid chromosphere'' class display signatures of cool (T<~2×104 K) winds together with hot emission lines from species like C IV (T~105 K). A survey of such stars by Reimers et al. using ROSAT reported numerous X-ray detections (T~106 K), strengthening the (then her…
Galaxy Evolution Explorer Ultraviolet Spectroscopy and Deep Imaging of Luminous Infrared Galaxies in the European Large-Area ISO Survey S1 Field
Buat, Véronique; Burgarella, Denis; Heckman, Timothy M. +23 more
The European Large-Area ISO Survey (ELAIS) S1 field was observed by the Galaxy Evolution Explorer (GALEX) in both its Wide Spectroscopic and Deep Imaging Survey modes. This field was previously observed by the Infrared Space Observatory, and we made use of the catalog of multiwavelength data published by the ELAIS consortium to select galaxies com…
An XMM-Newton view of M101 - II. Global X-ray source properties
Warwick, R. S.; Roberts, T. P.; Ward, M. J. +2 more
We present the global X-ray properties of the point source population in the grand-design spiral galaxy M101, as seen with XMM-Newton. 108 X-ray sources are detected within the D25 ellipse of M101, of which ~24 are estimated to be background galaxies. Multiwavelength cross-correlations show that 20 sources are coincident with HII region…
Blue Stragglers in Low-Luminosity Star Clusters
Sandquist, Eric L.
We examine the blue straggler populations of 13 low-luminosity (MVt>~-6) globular clusters and two old open clusters. These clusters test blue straggler formation in environments intermediate between higher luminosity (and usually higher density) clusters and the Galactic field. The anticorrelation between the relative fre…
Expectations for Cassini observations of ring material with nearby moons
Lewis, Mark C.; Stewart, Glen R.
This paper describes N-body simulations of two regions of the saturnian ring system and examines what we might expect the Cassini orbiter to see in those areas. The first region is the edge of the Encke gap in the A ring that is perturbed by the satellite, Pan. Our previous simulations of this region neglected particle self-gravity [Lewis and Stew…