NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Relativistic Iron Emission and Disk Reflection in Galactic Microquasar XTE J1748-288We report evidence for an Fe K-alpha fluorescence line feature and disk reflection in the very high, high-, and low-state X-ray spectra of the Galactic microquasar XTE J1748 - 288 during its 1998 June outburst. Spectral analyses are made on data gathered throughout the outburst by the Rossi X-Ray Timing Explorer Proportional Counter Array. Gaussian line, relativistic disk emission line, and ionized disk reflection models are fitted to the data. In the very high state the line profile appears strongly redshifted, consistent with disk emission from the innermost stable orbits around a maximally rotating Kerr black hole. In the high state the line profile is less redshifted and increasingly prominent. The low-state line profile is very strong (approx. 0.5 keV equivalent width) and centered at 6.7 +/- 0.10 keV; disk line emission model fits indicate that the inner edge of the disk fluctuates between approx. 20R(sub g) and - approx. 100R(sub g) in this state. The disk reflection fraction is traced through the outburst; reflection from an ionized disk is preferred in the very high and high states, and reflection from a relatively neutral disk is preferred in the low state. We discuss the implications of our findings for the binary system dynamics and accretion flow geometry in XTE J1748 - 288.
Document ID
20010037930
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Miller, J. M.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Fox, D. W.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
DiMatteo, T.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Wijnands, R.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Belloni, T.
(Osservatorio Astronomico di Brera Merate, Italy)
Pooley, D.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Kouveliotou, C.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Lewin, W. H. G.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Date Acquired
August 20, 2013
Publication Date
January 10, 2001
Publication Information
Publication: Astrophysical Journal
Publisher: American Astronomical Society
Volume: 546
Subject Category
Space Radiation
Funding Number(s)
CONTRACT_GRANT: NAS8-39073
CONTRACT_GRANT: PF9-10010
CONTRACT_GRANT: PF9-10005
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available