The Nature of the INTEGRAL Sources in the Galactic Plane

Details The Nature of the INTEGRAL Sources in the Galactic Plane The Nature of the INTEGRAL Sources in the Galactic Plane

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0141t&link_type=abstract

American Astronomical Society, HEAD meeting #9, #1.41; Bulletin of the American Astronomical Society, Vol. 38, p.335

Astronomy and Astrophysics

Astronomy

Scientific paper

Hard X-ray imaging of the Galactic plane by the INTEGRAL satellite is uncovering large numbers of 20-100 keV IGR sources. Although the source type is currently unknown for more than half of the roughly 120 IGR sources, the sources that have been identified include 19 active galactic nuclei (AGN), 16 high-mass X-ray binaries (HMXBs), four cataclysmic variables (CVs), and a few LMXBs. Probably the biggest surprise is the large number of HMXBs that have been missed in earlier soft X-ray surveys due to their high column densities. It is possible that the IGR HMXBs fill a gap in the sequence of binary evolution. In this presentation, we update the status of follow-up studies of IGR sources, including our future plans. Currently, we are using Chandra to obtain precise positions that allow for optical and IR identifications, XMM-Newton to search for pulsations, and RXTE to obtain orbital solutions.
JAT acknowledges partial support from Chandra award GO5-6037X issued by the Chandra X-ray Observatory Center, which is operated by SAO for and on behalf of NASA under contract NAS8-03060. JAT also acknowledges partial support from NASA INTEGRAL Guest Observer grant NNG05GC49G.

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