EDP Sciences
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Volume 411, Number 1, November III 2003
Special letters issue on: first science with integral
Page(s) L421 - L425
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20031140

A&A 411, L421-L425 (2003)
DOI: 10.1051/0004-6361:20031140


INTEGRAL observations of the black hole candidate H 1743-322 in outburst

A. N. Parmar, E. Kuulkers, T. Oosterbroek, P. Barr, R. Much, A. Orr, O. R. Williams and C. Winkler

Research and Scientific Support Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
(Received 11 July 2003 / Accepted 28 July 2003)

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 ( $l = 357^\circ, \, b = -2^\circ)$ 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 $((2.5 \, ^{+4.3} _{-2.5}) \times 10^{22}$ atom cm -2) soft (photon index $2.70 \pm 0.09$) power-law model, consistent with H 1743-322 being in a high/soft state.

Key words: accretion, accretion disks -- X-rays: individual: H 1743-322 -- X-rays: binaries

Offprint request: A. N. Parmar, aparmar@esa.int

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