Search Publications
FUSE Measurements of Far-Ultraviolet Extinction. I. Galactic Sight Lines
Gordon, Karl D.; Sofia, Ulysses J.; Snow, Theodore P. +8 more
We present extinction curves that include data down to far-ultraviolet wavelengths (FUV; 1050-1200 Å) for nine Galactic sight lines. The FUV extinction was measured using data from the Far Ultraviolet Spectroscopic Explorer. The sight lines were chosen for their unusual extinction properties in the infrared through the ultraviolet; that they probe…
Metal Abundances in a Damped Lyα System along Two Lines of Sight at z = 0.93
Wisotzki, Lutz; Gregg, Michael D.; Lopez, Sebastian +3 more
We study metal abundances in the z=0.9313 damped Lyα system observed along the two lines of sight, A and B, toward the gravitationally lensed double QSO HE 0512-3329. Spatially resolved Space Telescope Imaging Spectrograph spectra constrain the neutral-gas column density to be N(HI)=1020.5 cm-2 in both A and B. UV-visual Eche…
The dynamic neptunian ring arcs: evidence for a gradual disappearance of Liberté and resonant jump of courage
de Pater, Imke; Macintosh, Bruce; Marchis, Franck +6 more
We present Adaptive Optics observations of Neptune's ring system at 1.6 and 2.2 µm, taken with the 10-m W.M. Keck II telescope in July 2002 and October 2003. We recovered the full Adams and Le Verrier rings for the first time since the Voyager era (1989), and show that the overall appearance of these rings did not change much, except for the…
Computing the reconnection rate at the Earth's magnetopause using two spacecraft observations
RèMe, H.; Owen, C. J.; Fuselier, S. A. +2 more
A new multispacecraft technique is introduced which, under some restrictive assumptions and conditions, provides a snapshot of the reconnection inflow velocity into the magnetosphere and an estimate of the distance from the spacecraft to the reconnection site. The two quantities are not obtained independent of one another and additional, independe…
Using the ROSAT Bright Source Catalogue to find counterparts for IBIS/ISGRI survey sources
Walter, R.; Bird, A. J.; Ubertini, P. +8 more
The IBIS/ISGRI first year galactic plane survey has produced a catalogue containing 123 hard X-ray sources visible down to a flux limit of a few milliCrabs. The point source location accuracy of typically 1-3 arcmin has allowed the counterparts for 95 of these sources to be found at other wavelengths. In order to identify the remaining 28 objects,…
3D continuum radiative transfer in complex dust configurations. II. 3D structure of the dense molecular cloud core ρ Oph D
Henning, Th.; Bacmann, A.; Stickel, M. +2 more
Constraints on the density and thermal 3D structure of the dense molecular cloud core ρ Oph D are derived from a detailed 3D radiative transfer modeling. Two ISOCAM images at 7 and 15 µm are fitted simultaneously by representing the dust distribution in the core with a series of 3D Gaussian density profiles. Size, total density and position …
Mid-IR observations of circumstellar disks. I. Pre-main sequence objects
Sterzik, M. F.; Meeus, G.; Schütz, O.
We present new N-band photometry and spectroscopy for a sample of eight pre-main sequence stars including T Tauri, Herbig Ae/Be stars and FU Ori objects using the ESO TIMMI2 camera at the La Silla observatory (Chile). For some objects this is their first N-band spectroscopic observation ever. The FU Ori stars V 346 Nor, V 883 Ori and Z CMa show a …
The INTEGRAL/IBIS Source AX J1838.0-0655: A Soft X-Ray-to-TeV γ-Ray Broadband Emitter
Walter, R.; Bird, A. J.; Ubertini, P. +8 more
We report on INTEGRAL observations of AX J1838.0-0655, one of the unidentified objects listed in the first IBIS/ISGRI survey catalog and located in the Scutum arm region. This object, detected in the 20-300 keV band at a confidence level of 15.3 σ (9 × 10-11 ergs cm-2 s-1), is the likely counterpart of the still un…
Examination of type II origin with SOHO/LASCO observations
Cho, K. -S.; Kim, Y. -H.; Moon, Y. -J. +5 more
We examine a possibility that metric type II solar radio bursts are all caused by coronal mass ejection (CME) generated shocks. For this we consider 129 type II flare events from February 1997 to October 2000 and examine their associations with SOHO/LASCO CMEs according to their temporal and spatial closeness using SOHO/EIT and GOES data. We then …
The XMM-Newton Detection of Diffuse Inverse Compton X-Rays from Lobes of the FR II Radio Galaxy 3C 98
Isobe, N.; Makishima, K.; Tashiro, M. +1 more
The XMM-Newton observation of the nearby FR II radio galaxy 3C 98 is reported. In two exposures on the target, faint diffuse X-ray emission associated with the radio lobes was significantly detected together with a bright X-ray active nucleus, of which the 2-10 keV intrinsic luminosity is (4-8)×1042 ergs s-1. The EPIC spectra…