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10405.0 [No comment] 16.10.2006 14:32 Released

ID: 10405.0, MPI für Astrophysik / High Energy Astrophysics at MPA
Chandra and RXTE spectroscopy of the Galactic microquasar XTE J1550-564 in outburst
Authors:Miller, J. M.; Marshall, H. L.; Wijnands, R.; Di Matteo, T.; Fox, D. W.; Kommers, J.; Pooley, D.; Belloni, T.; Casares, J.; Charles, P. A.; Fabian, A. C.; van der Klis, M.; Lewin, W. H. G.
Date of Publication (YYYY-MM-DD):2002-01-01
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. R. Astr. Soc.
Issue / Number:1
Start Page:7
End Page:13
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:On two occasions, we obtained nearly simultaneous similar or equal to4 ks snapshot observations of the Galactic black hole and microquasar XTE J1550-564 with Chandra and RXTE near the peak of its 2000 May outburst. The low-energy sensitivity of Chandra and the resolution of the High Energy Transmission Grating Spectrometer (HETGS), coupled with the broad energy range and large collecting area of RXTE, have allowed us to place constraints on the outburst accretion flow geometry of this source in the 'intermediate' X-ray state. The 0.65-25.0 keV continuum spectra are well described by a relatively hot (kT similar or equal to 0.8 keV) accretion disc and hard (Gammasimilar or equal to 2.3) coronal power-law components. Broad, relatively strong Fe Kalpha emission line (W (Kalpha) similar or equal to 170 eV) and smeared absorption edge components consistent with Fe xxv are strongly required in joint spectral fits. The resolution of the Chandra/HETGS reveals that the broad Fe Kalpha emission lines seen clearly in the individual RXTE spectra are not the result of an intrinsically narrow line.
Free Keywords:accretion; accretion discs; black hole physics; line : profiles; relativity; X-rays : bursts; X-rays : stars
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:MIT, Ctr Space Res, Cambridge, MA 02139 USA; MIT, Ctr Space Res, Cambridge, MA 02139 USA; MIT, Dept Phys, Cambridge, MA 02139 USA; Max Planck Inst Astrophys, D-85741 Garching, Germany; CALTECH, Space Radiat Lab, Pasadena, CA 91125 USA; Osservatorio Brera, I-20121 Milan, Italy; Inst Astrofis Canarias, Tenerife 38200, Spain; Univ Southampton, Southampton SO17 1BJ, Hants, England; Univ Cambridge, Inst Astron, Cambridge CB3 OHA, England; Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands; Univ Amsterdam, Ctr High Energy Astrophys, NL-1098 SJ Amsterdam, Netherlands