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Record 1 of 18989
Evolution of the Iron K-Alpha Emission Line in the Black Hole Candidate GX339-4 During and Outburst Decay Phase
Author and Affiliation:
Feng, Y.
Zhang, S.-N.
Chen, W.
Cui, Wei
Abstract: The evolution of the iron K-alpha line emission feature was found from the black hole candidate GX339-4 when its X-ray flux (2 to 10 keV) decreased significantly. With RXTE observations, a broad line emission feature around 7 keV was detected in its quiescent and low flux state; while in the high flux state, an emission line feature around 6.4 keV was detected. A similar 6.4 keV line feature was also detected with previous ASCA observations in a high flux state. We consider that the evolution could be the evidence of the variations in the geometric structure and the physical properties of the accretion flow when the accretion rate changed. This is because that the 7 keV line feature can be produced by the radiative recombination cascade, collisional excitation, and fluorescence of Fe XXVI and Fe XXV, which can exist in a very high temperature plasma; while the 6.4 keV line feature can be produced by fluorescent K-alpha line emission of neutral iron atoms in the cold accretion disk. (copyright) 1999 American Astronomical Society. All rights reserved.
Publication Date: Dec 01, 1999
Document ID:
20040073174
(Acquired Jun 14, 2004)
Subject Category: ASTROPHYSICS
Report/Patent Number: AAS-126.05
Document Type: Journal Article
Publication Information: Bulletin of the American Astronomical Society; Volume 31; 1556
Publisher Information: American Astronomical Society, United States
Meeting Information: 195th AAS Meeting; Unknown
Meeting Sponsor: American Astronomical Society; United States
Contract/Grant/Task Num: NAG5-7927
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Maryland Univ.; MD, United States
NASA Goddard Space Flight Center; Greenbelt, MD, United States
Alabama Univ.; Huntsville, AL, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: K LINES; IRON; BLACK HOLES (ASTRONOMY); X RAY ASTRONOMY; BURSTS; X RAY SPECTRA
Availability Source: Other Sources
Availability Notes: Abstract Only
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