Hard X-ray observations of transient X-ray source GS 1843+00

Details Hard X-ray observations of transient X-ray source GS 1843+00 Hard X-ray observations of transient X-ray source GS 1843+00

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.305..409m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 305, Issue 2, pp. 409-411.

Astronomy and Astrophysics

Astronomy

6

Accretion, Accretion Discs, Pulsars: Individual: Gs 1843+00, X-Rays: Stars

Scientific paper

The transient X-ray source GS 1843+00 was observed in the hard X-ray region from 20 to 200 keV, during its flare mode in 1997 March. Spectral measurements were made during a balloon flight experiment using a newly designed large-area scintillation counter telescope. The present observations correspond to the mid-point of the transient phase. The X-ray spectrum, observed for the first time beyond 40 keV, is quite hard and the estimated intensity of the source corresponds to ~ 100 mCrab in the 20-180 keV region. The time-averaged spectrum can be represented by a photon power-law index alpha ~ 1.7 +/- 0.2. A complex function consisting of a power law with exponential term is necessary to produce the best fit to the data. We discuss the new data in terms of the source geometry and the X-ray emission mechanism.

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