A broad-band X-ray telescope observation of the black hole candidate LMC X-1

Details A broad-band X-ray telescope observation of the black hole candidate LMC X-1 A broad-band X-ray telescope observation of the black hole candidate LMC X-1

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422..243s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 422, no. 1, p. 243-247

Astronomy and Astrophysics

Astronomy

22

Black Holes (Astronomy), Spectral Line Width, X Ray Astronomy, X Ray Spectra, Stellar Mass, X Ray Telescopes

Scientific paper

We present the spectrum of the black hole candidate LMC X-1 as observed by the Broad-Band X-ray Telescope (BBXRT). The spectrum cannot be fitted by a simple model, but it requires a soft disk blackbody component and a power-law tail, confirming earlier studies. The blackbody disk component is essentially unchanged since the Ginga measurement in 1987. The implied mass of the compact object is approximately 4.7 (square root of cosine i) solar mass from the soft component fit. We report a 95% confidence detection of weak emission features at approximately 5.1 keV and approximately 7.3 keV. If the 5.1 keV feature is attributed to Fe I K-alpha at 6.39 keV, then the redshift is approximately 0.19. No quasi-periodic behavior is found in the data at this epoch.

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