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Title:
A broad-band X-ray telescope observation of the black hole candidate LMC X-1
Authors:
Schlegel, Eric M.; Marshall, F. E.; Mushotzky, R. F.; Smale, A. P.; Weaver, K. A.; Serlemitsos, P. J.; Petre, R.; Jahoda, K. M.
Affiliation:
AA(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AB(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AC(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AD(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AE(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AF(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AG(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AH(NASA. Goddard Space Flight Center, Greenbelt, MD, US)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 422, no. 1, p. 243-247 (ApJ Homepage)
Publication Date:
02/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Black Holes (Astronomy), Spectral Line Width, X Ray Astronomy, X Ray Spectra, Stellar Mass, X Ray Telescopes
DOI:
10.1086/173722
Bibliographic Code:
1994ApJ...422..243S

Abstract

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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