X-ray spectrum and variability of the black hole candidate LMC X-3

Details X-ray spectrum and variability of the black hole candidate LMC X-3 X-ray spectrum and variability of the black hole candidate LMC X-3

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..119t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 1, 1988, p. 119-127.

Astronomy and Astrophysics

Astronomy

29

Black Holes (Astronomy), X Ray Binaries, X Ray Spectra, Accretion Disks, Energy Spectra, Optical Thickness

Scientific paper

LMC X-3 was observed on seven occasions in 1983-1984 with the Exosat satellite covering various orbital phases. No phase related variability was detected, while the X-ray flux increased gradually by about 30 percent in two weeks. Analysis of the short term variability in terms of autocorrelation reveals a minimum time scale of 600 s, with an rms amplitude of about 1 percent. Energy spectra in the 0.3-9 keV range have been fitted with various analytical laws. A good fit is obtained with the Comptonization spectrum given by Sunyaev and Titarchuk (1980), yielding an optical depth tau about 23 and a temperature of about 1 keV. The results are compared with those of Cygnus X-1 in the low state and with the expectations of the standard accretion disk model.

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