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Spectral study of GX 339-4 in the low-intensity state observed with GingaThe energy spectra of the black-hole candidate GX 339-4 in the low-intensity state were observed on four occasions through 1989 to 1991 with the Large Area Counter on board the Ginga satellite. The spectra showed significant deviations from a power-law, with an iron K(sub alpha) emission line at approximetaly 6.4 keV and a broad iron K-edge structure above approximately 7 keV. The enrgy spectra above approximately 4 keV were successfully explained with a reflection model, in which part of the incident X-rays with a power-law spectrum is Compton reflected by optically thick matter, resulting in a harder continuum component with iron K-edge absorption and an iron flourescent line. The line equivalent width with respect to the reflection component decreases as the source flux increases. This is consistent with an increase in the ionization state of the material, so that resonant absorption followed by Auger ionization depletes the line. The photon-index of the power-law component was clearly variable, and it correlated with the relative amount of the reflection component. Such a correlation may be explained in the context of the anisotropic Comptonization models of Haardt et al. (1993), or by a variation of the relative geometry of the source and disk.
Document ID
19950040749
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ueda, Yoshihiro
(Inst. of Space and Astronautical Science Sagamihara, Japan)
Ebisawa, Ken
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Done, Chris
(Leiscester Univ. Leiscester, United Kingdom)
Date Acquired
August 16, 2013
Publication Date
January 1, 1994
Publication Information
Publication: PASJ: Publications of the Astronomical Society of Japan
Volume: 46
Issue: 1
ISSN: 0004-6264
Subject Category
Astrophysics
Accession Number
95A72348
Distribution Limits
Public
Copyright
Other

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