X-ray Spectrum of the Black Hole Candidate X1755-338

Details X-ray Spectrum of the Black Hole Candidate X1755-338 X-ray Spectrum of the Black Hole Candidate X1755-338

1995-02-27

arxiv.org/abs/astro-ph/9502099v1

Mon.Not.Roy.Astron.Soc. 274 (1995) L15-L18

Astronomy and Astrophysics

Astrophysics

4 pages, compressed and uuencoded postscript file, to be published in MNRAS (Letters)

Scientific paper

We report the first detection of a hard power-law tail in the X-ray spectrum of the black hole candidate (BHC) binary X1755-338, which was observed in 1989 March-September during the TTM Galactic Centre survey. In addition, an ultrasoft thermal component with a temperature of ~1.1-1.4 keV was also detected. We demonstrate that the soft and hard X-ray components of X1755-338 vary independently, as in the spectra of the well known BHCs LMC X-1, LMC X-3 and GX339-4 in their high (intensity) state. If the hard tail observed from X1755-338 is generated near the black hole by energetic electrons up-scattering low energy photons, the un-correlated variations imply that the soft X-rays from accretion disc may not be the main photon seeds needed for inverse Comptonization. The TTM observations strongly suggest that X1755-338 does indeed belong to the family of BHCs.

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