Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-21
Astronomy and Astrophysics
Astrophysics
4 pages. Proceedings of the V INTEGRAL Workshop, Munich 16-20 February 2004 (ESA SP-552)
Scientific paper
We report on results from a 2003 February INTEGRAL observation of the black hole candidate (BHC) 4U 1630-47 and the high energy sources in the Norma Region of the Galaxy and on RXTE and radio observations of 4U 1630-47. To date, there have been 38 new or previously poorly studied sources found by INTEGRAL (the ``IGR'' sources), and 15 of the IGR sources are in the field of view of our observation. We detect 12 of the 15 sources, and we speculate that a subset of the IGR sources may be part of a new population of persistent, hard, intermediate luminosity X-ray sources. During our observations, 4U 1630-47 was in an intermediate state with strong soft and hard components, a power-law photon index of 2.11-2.18, a 4% rms level of timing noise (0.1-10 Hz), and the source was not detected in the radio band. We discuss the evolution of the energy spectrum during the 293 ks INTEGRAL observation, and we report on rapid, high amplitude flaring behavior that has been seen for much of the 2002-2004 outburst.
Corbel Stephane
Goldwurm Andréa
Kaaret Philip
Lingenfelter Richard
Tomsick John A.
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