Computer Science
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2927f&link_type=abstract
Chandra proposal ID #10408326
Computer Science
Scientific paper
We recently identified a ULX that provides the strongest evidence for the existence of intermediate mass black holes (Farrell et al., 2009, Nature, 460, 73). Previous observations with XMM and Swift gave incompatible positions at the 1 sigma level. We obtained a 1 ks Chandra DDT observation on 07/04/09 to resolve this discrepancy. The ULX was not detected, so has dropped by a factor >6 in flux. By analogy with stellar mass black holes, this might indicate a transition into a low/hard state; such a transition has never been observed so far from any ULX. Triggered by this result and the unique properties of the source, we are currently preparing requests for deep ground and space-based telescope observations, whose analysis will require a high precision that only Chandra can provide. Even a non-detection would be a highly significant result, as it could indicate the ULX has undergone a transition into the low/hard state; a phenomenon commonly observed in Galactic X-ray binaries.
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