Monitoring Faint X-ray Transients in the Galactic Center

Details Monitoring Faint X-ray Transients in the Galactic Center Monitoring Faint X-ray Transients in the Galactic Center

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cxo..prop.2151b&link_type=abstract

Chandra Proposal ID #08400783

Physics

Chandra Proposal Id #08400783

Scientific paper

We propose eight 5-ks ACIS-I observations of the SgrA* field to monitor the rate of faint X-ray transients in the central 25 pc of the Galaxy. This region contains 0.1% of the Galactic stellar mass, making it an ideal location for studying faint X-ray transients. In 6 years of Chandra observations, we have detected 7 transients with luminosities greater than 5e+33 erg/s, indicating that they are either HMXBs or LMXBs containing a black hole or neutron star. Remarkably, 4 of the transients are located within 1 pc of SgrA*, 20 times overabundant per unit stellar mass. This may be evidence for a cluster of several tens of thousands of black holes and neutron stars swarming around the Galactic supermassive black hole, as predicted by Morris (1993) and Miralda-Escude & Gould (2000).

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