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INTEGRAL observations of the black hole candidate H 1743-322 in outburst
Parmar, A. N.; Kuulkers, E.; Oosterbroek, T. +5 more
INTEGRAL made 3 observations in 2003 April of the black hole candidate H 1743-322 during the rising part, and close to the maximum, of an outburst. H 1743-322 was previously observed in outburst in 1977-1978. The source is located in a crowded region of the sky (l = 357o, b = -2o) and at least 18 sources are clearly detected …
The X-ray spectra of the flaring and quiescent states of AT Microscopii observed by XMM-Newton
Raassen, A. J. J.; Mewe, R.; Audard, M. +1 more
The X-ray spectrum of the late-type M-dwarf binary AT Mic (dM4.5e+dM4.5e) is observed in the wavelength range 1-40 Å by means of RGS and EPIC-MOS on board XMM-Newton. During the exposure a flare occured. We have performed a 3-temperature fit and a DEM-modeling to the flaring and quiescent part of the spectrum. We report the coronal temperature dis…
Variable Na I Absorption toward ρ Leonis: Biased Neutral Formation in the Diffuse Interstellar Medium?
Meyer, David M.; Lauroesch, J. T.
We present multiepoch KPNO coudé feed telescope observations of interstellar Na I and Ca II absorption toward the bright star ρ Leo. Comparisons of the Na I profiles observed over a period of 8 yr reveal significant temporal variations in the Na I column in at least one component, implying that there is ``structure'' at scales on the order of the …
The Collimated Wind in NGC 253
Sugai, H.; Davies, R. I.; Ward, M. J.
Near-infrared Fabry-Perot imaging has revealed H2 emission extended to about 130 pc from the disk of NGC 253. It is closely related to the hot plasma observed in soft X-rays: filamentary H2 features are found at the edges of the hot plasma. These are the places of direct interaction between a superwind and its surrounding mol…
Variation of coronal line widths on and off the disk
Poedts, S.; Banerjee, D.; O'Shea, E.
We present observations of a Mg X 625 Å coronal line, obtained with the CDS instrument on SoHO, extending from the disk part of the coronal hole to ~ 90 000 km above the limb in the north polar coronal hole. Observations were performed in polar plumes and inter-plume lanes. To obtain a sufficiently high signal-to-noise ratio the observations were …
Cassini RADAR: prospects for Titan surface investigations using the microwave radiometer
Lorenz, Ralph D.; West, Richard D.; Janssen, Michael A. +3 more
The Radar instrument on the Cassini spacecraft can be used in a passive radiometric mode to map the microwave emission from Titan: these will be the first resolved microwave emission measurements of an icy satellite. Observation plans and the theory for their interpretation is presented: these data should be able to provide crude composition maps …
Constraints on the Cluster Environments and Hot Spot Magnetic Field Strengths of the Radio Sources 3C 280 and 3C 254
Donahue, Megan; Daly, Ruth A.; Horner, Donald J.
We present new Chandra Observatory observations together with archival Hubble Space Telescope (HST) and radio observations of 3C 254, a radio quasar at z=0.734, and 3C 280, a radio galaxy at z=0.996. We report the detection of X-ray and possible HST optical counterparts to the radio hot spots in 3C 280 and the detection of an X-ray counterpart to …
XMM-Newton RGS spectroscopy of LMC X-3
Page, M. J.; Soria, R.; Mason, K. O. +3 more
We present soft X-ray spectroscopy of the black hole binary LMC X-3 from the XMM-Newton Reflection Grating Spectrometer. The observations span the full range of spectral states seen in LMC X-3. The spectra are completely dominated by continuum emission, and the neutral absorbing column measured from the OI edge (NH= 3.8+0.8
XMM-Newton study of hard X-ray sources in IC 443
Bocchino, F.; Bykov, A. M.
We present XMM-Newton observations of hard X-ray emission from the field of IC 443, a supernova remnant interacting with a molecular cloud. The hard emission from the field is dominated by 12 isolated sources having 2-10 keV flux {ga } 10-14 erg cm-2 s-1. Only a fraction of the sources are expected to be extragalac…
Mass Motions and Plasma Properties in the 107 K Flare Solar Corona
Curdt, W.; Innes, D. E.; Landi, E. +1 more
In the present work, we analyze Solar Ultraviolet Measurement of Emitted Radiation (SUMER) observations of a solar limb flare that occurred on 1999 May 9. The analyzed data cover a time span of around 6.4 hr, during which an M-7.6 flare erupted and decayed in the field of view. Two selected regions along the SUMER slit have been considered for qua…