Simultaneous X-ray, ultraviolet, and optical observations of LMC X-3

Details Simultaneous X-ray, ultraviolet, and optical observations of LMC X-3 Simultaneous X-ray, ultraviolet, and optical observations of LMC X-3

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..266t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. 266-271.

Astronomy and Astrophysics

Astronomy

18

Black Holes (Astronomy), Magellanic Clouds, Ultraviolet Astronomy, X Ray Astronomy, X Ray Sources, Iue, Power Spectra, Spectral Energy Distribution, X Ray Spectra

Scientific paper

The black hole candidate LMC X-3 was observed simultaneously at X-ray (Ginga), UV (IUE), and optical frequencies in 1988 January. The X-ray energy distribution is the superposition of a thermal component and a hard tail. The former component can be described equally well by a Comptonization spectrum or by a disk blackbody. In the latter picture, the high-energy tail may derive from the inner part of the accretion disk, which is hot and transparent. Optical and UV data indicate a very low state of the source. Comparing with 1984 observations, one finds that the optical-to-X-ray flux ratio is not maintained, possibly indicating a secular variation of the disk structure, or a change of the anisotropy of the X-ray emission.

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