Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392l..19b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. L19-L22.
Astronomy and Astrophysics
Astronomy
16
Black Holes (Astronomy), Stellar Luminosity, Stellar Mass Accretion, X Ray Stars, Maximum Entropy Method, Sky Surveys (Astronomy), Telescopes
Scientific paper
While monitoring the region of the sky containing Cir X-1, the SIGMA telescope detected a new hard X-ray source whose position is compatible with that of TrA X-1 (A1524 - 62), an ultrasoft X-ray transient discovered 15 years ago by Ariel 5. The SIGMA result supports the idea that TrA X-1 may be powered by accretion onto a black hole, as previously proposed by White and coworkers on the basis of its soft X-ray spectral properties. Since none of the X-ray all-sky monitors operating at the time of the SIGMA observation has reported a bright state for TrA X-1, the high-energy emission detected by SIGMA seems more likely to be related to a low-intensity outburst, further characterized by a hard spectrum with a weak soft X-ray component.
Barret Dider
Bouchet Laurent
Chulkov I.
Churazov Eugene
Diachkov A.
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