A Search for Hard X-Ray Emission from Globular Clusters with BATSE

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Session 22 -- Galactic Structure; Galactic Center
Display presentation, Monday, 9, 1995, 9:20am - 6:30pm

[22.19] A Search for Hard X-Ray Emission from Globular Clusters with BATSE

E. C. Ford, M. Tavani, P. Kaaret (Columbia University), B. A. Harmon (NASA/MSFC), S. N. Zhang (USRA)

We describe the current status of a search for hard x-ray emission from 23 globular clusters using BATSE. The high stellar density in globular clusters leads to a vastly enhanced concentration of binary star systems there. Since most hard x-ray transients are thought to be produced by binaries containing a compact object, there should be a higher concentration of hard x-ray transient sources in clusters. We have selected clusters which are removed from the galactic center, to minimize source confusion, and that are either nearby or contain a persistent LMXB. We report the results of a search of 1.5 years of archival data for transient events. The search has a sensitivity of approximately 50 mCrab for integration times of one day.

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