IBIS/ISGRI observations of galactic compact sources

Details IBIS/ISGRI observations of galactic compact sources IBIS/ISGRI observations of galactic compact sources

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005tmgm.meet..829g&link_type=abstract

The Tenth Marcel Grossmann Meeting. Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF), Rio

Physics

Scientific paper

We report on preliminary results of IBIS/ISGRI observations of Compact Galactic Sources in the Cygnus Region during the INTEGRAL Performance and Verification (PV) phase in November and December 2002. The main target of the PV phase was the Black Hole binary Cyg X-1 and the total observing time was ~ two million of seconds but other well known hard X-ray sources were in the instrument field of view. We will focus on the 3 brightest sources: Cyg X-1, the microquasar Cyg X-3 and the transient X-ray pulsar EXO 2030+375. During the observing period Cyg X-1 was in its characteristic low/hard state, in which a few flares and dips were observed. No state changes were observed, but spectral variations associated with flares were clearly detected. During staring observations of Cyg X-1, the peculiar microquasar Cyg X-3 was at a ~ 9° distance from the pointing direction. From these observations we obtained two light curve in the 20-40 keV and 40-100 keV energy band which exhibits the characteristic 4.8-hour modulation with a shape consistent with a standard template. The two light curves' phase zero have no measurable offset and their values are consistent with historical ephemeris. Finally from 9 to 21 December 2002 IBIS/ISGRI detected one periodic outburst of the transient X-ray pulsar EXO 2030+375. The outburst light curve and spectral shape are consistent with already published results. The IBIS/ISGRI results demonstrate that the INTEGRAL observatory offers a unique capability for studying temporal and spectral behavior of several bright sources in the FOV.

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