Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45..605y&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 4, p. 605-616
Astronomy and Astrophysics
Astronomy
78
Absorption Spectra, Accretion Disks, Energy Spectra, Power Spectra, Spectrum Analysis, X Ray Astronomy, X Ray Binaries, Black Holes (Astronomy), Ginga Satellite, Neutron Stars
Scientific paper
The low-mass X-ray binary X1608-522 was observed with Ginga on three occasions from 1989 to 1991. The source energy was in the low state throughout the observations. The energy spectrum in the energy range of 2-60 keV can be approximated by a power-law function with a broad absorption-like structure. The structure can be represented either by partial absorption or by a reflection of the power-law spectrum. The ionization degree of the absorbing/reflecting medium increases when the source luminosity increases by a factor of about three, while the percentage of the absorbed/reflected component relative to the total intensity decreases. The power spectrum is characterized by a flat top below a certain frequency, while it decreases approximately as 1/f above that frequency. The turn-over frequency varies according to the source luminosity, and is in a range 0.2 to 1 Hz. Additional structures, which can be represented by a broad Lorentzian peak, also exist in the power spectrum. The physical state of the accretion disk is discussed in conjunction with the low state of black-hole candidates.
Done Chris
Ebisawa Ken
Fujimoto Ryuichi
Mitsuda Kazuhisa
Ueda Yoshihiro
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