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INTEGRAL IGR J18135-1751 = HESS J1813-178: A New Cosmic High-Energy Accelerator from keV to TeV Energies
Walter, R.; Bird, A. J.; Ubertini, P. +10 more
We report the discovery of a soft gamma-ray source, namely, IGR J18135-1751, detected with IBIS, the Imager on Board the INTEGRAL Satellite. The source is persistent and has a 20-100 keV luminosity of ~5.7× 1034 ergs s-1 (assuming a distance of 4 kpc). This source is coincident with one of the eight unidentified objects recen…
System Parameters of the Transiting Extrasolar Planet HD 209458b
Henry, Gregory W.; Butler, R. P.; Wittenmyer, Robert A. +10 more
We derive improved system parameters for the HD 209458 system using a model that simultaneously fits both photometric transit and radial velocity observations. The photometry consists of previous Hubble Space Telescope STIS and FGS observations, 12 I-band transits observed between 2001 and 2003 with the Mount Laguna Observatory 1 m telescope, and …
A New Variety of Coronal Mass Ejection: Streamer Puffs from Compact Ejective Flares
Bemporad, A.; Poletto, G.; Moore, Ronald L. +1 more
We report on SOHO UVCS, LASCO, EIT, and MDI observations of a series of narrow ejections that occurred at the solar limb. These ejections originated from homologous compact flares whose source was an island of included polarity located just inside the base of a coronal streamer. Some of these ejections result in narrow CMEs (``streamer puffs'') th…
FUSE Measurements of Far-Ultraviolet Extinction. II. Magellanic Cloud Sight Lines
Martin, P. G.; Gordon, Karl D.; Sofia, Ulysses J. +8 more
We present an extinction analysis of nine reddened/comparison star pairs in the Large and Small Magellanic Clouds (LMC and SMC) based on Far-Ultraviolet Spectroscopic Explorer (FUSE) FUV observations. To date, just two LMC sight lines have probed dust grain composition and size distributions in the Magellanic Clouds using spectral data for wavelen…
X-Ray Observations of the Black Hole Transient 4U 1630-47 during 2 Years of X-Ray Activity
Kaaret, Philip; Goldwurm, Andrea; Tomsick, John A. +1 more
The black hole candidate (BHC) X-ray transient 4U 1630-47 continuously produced strong X-ray emission for more than 2 years during its 2002-2004 outburst, which is one of the brightest and longest outbursts ever seen from this source. We use more than 300 observations made with the Rossi X-Ray Timing Explorer (RXTE) to study the source throughout …
Far-Infrared Observations of Radio Quasars and FR II Radio Galaxies
Egami, E.; Gordon, K. D.; Rieke, G. H. +6 more
We report MIPS photometry of 20 radio-loud quasars and galaxies at 24 and 70 µm (and of five at 160 µm). We combine this sample with additional sources detected in the far-infrared by IRAS and ISO for a total of 47 objects, including 23 steep-spectrum type I AGNs: radio-loud quasars and broad-line radio galaxies; and 24 type II AGNs: n…
Coronagraphic Imaging of Pre-Main-Sequence Stars with the Hubble Space Telescope Space Telescope Imaging Spectrograph. I. The Herbig Ae Stars
Roberge, A.; Gull, T. R.; Sitko, M. L. +10 more
STIS white-light coronagraphic imaging has been carried out for 14 nearby, lightly reddened Herbig Ae stars, providing data on the environments and disks associated with these stars. No disks are detected in our data when the Herbig Ae star is accompanied by a stellar companion at r<=2''. We find that the optical visibility of protop…
SDSS J042348.57-041403.5AB: A Brown Dwarf Binary Straddling the L/T Transition
Burrows, Adam; Kirkpatrick, J. Davy; Burgasser, Adam J. +3 more
We present the discovery of SDSS J042348.57-041403.5 as a closely separated (0.16") brown dwarf binary, resolved by the Hubble Space Telescope Near-Infrared Camera and Multi-Object Spectrometer. Physical association is deduced from the angular proximity of the components and constraints on their common proper motion. SDSS 0423-0414AB appears to be…
An Ultracompact X-Ray Binary in the Globular Cluster M15 (NGC 7078)
Knigge, C.; Charles, P. A.; Long, K. S. +5 more
We have used the Advanced Camera for Surveys on board the Hubble Space Telescope to image the core of the globular cluster M15 in the far-ultraviolet (FUV) wave band. Based on these observations, we identify the FUV counterpart of the recently discovered low-mass X-ray binary M15 X-2. Our time-resolved FUV photometry shows a modulation with 0.062+…
Rotationally Resolved 8-35 Micron Spitzer Space Telescope Observations of the Nucleus of Comet 9P/Tempel 1
A'Hearn, M. F.; Groussin, O.; Charmandaris, V. +6 more
We have utilized the Spitzer Space Telescope (SST) Infrared Spectrograph (IRS) to directly observe thermal emission from the nucleus of comet 9P/Tempel 1 on UT 2004 March 25-27. We obtained 8-35 µm low-resolution (R~100) spectra and contemporaneous 16 and 22 µm photometric imaging over a 39 hr period. The comet was 3.7 AU from the Sun …