INTEGRAL observations of the black hole candidate H 1743−322 in outburst
نویسنده
چکیده
INTEGRAL made 3 observations in 2003 April of the black hole candidate H 1743−322 during the rising part, and close to the maximum, of an outburst. H 1743−322 was previously observed in outburst in 1977–1978. The source is located in a crowded region of the sky (l = 357, b = −2) and at least 18 sources are clearly detected in the field of view of the ISGRI gamma-ray imager during a 277 ks exposure. These are well known persistent X-ray binary sources and 3 transient sources in outburst. The combined 5–200 keV JEM-X and SPI spectrum of H 1743−322 is well fit with an absorbed ((2.5 +4.3 −2.5)× 1022 atom cm−2) soft (photon index 2.70 ± 0.09) power-law model, consistent with H 1743−322 being in a high/soft state.
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