Detection of the A1742-294 X-ray burster above 35 keV

Details Detection of the A1742-294 X-ray burster above 35 keV Detection of the A1742-294 X-ray burster above 35 keV

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...443..341c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 443, no. 1, p. 341-347

Astronomy and Astrophysics

Astronomy

19

Emission Spectra, Plasma Spectra, X Ray Astronomy, X Ray Spectra, X Ray Stars, X Rays, Black Holes (Astronomy), Flux (Rate), Galactic Bulge, X Ray Telescopes

Scientific paper

A transient hard state of the A1742-294 X-ray burster was detected by Granat/SIGMA in the course of Fall 1992 observations of the Galactic center (GC) region. During the previous five sets of GC observations in 1990-1992, the flux above 35 keV was below the SIGMA detection limit. The spectrum observed in Fall 1992 in the 35-200 keV band can be approximated by the emission of optically thin plasma with temperature Te approximately 40 keV, much higher than Te approximately 8 keV derived from the observations in the standard X-ray band by Granat/ART-P in 1990. Nevertheless, the spectrum of A1742-294 remains significantly softer than that of the nearby black hole candidate 1E 1740.7-2942.

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