Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.8707v&link_type=abstract
American Astronomical Society Meeting 203, #87.07; Bulletin of the American Astronomical Society, Vol. 35, p.1347
Other
Scientific paper
In the past decade, gravitational microlensing of stars in our galaxy has progressed from an interesting theoretical possibility to a practical observational tool for exploring the properties of objects that are difficult to determine any other way. Since for a given geometry the duration scales with the square root of the lens mass, a particularly interesting class of microlensing events is the long duration events. Recently a very exciting long duration event toward the galactic bulge was discovered by the OGLE team and independently identified by the MACHO collaboration. The event, OGLE-1999-BUL-32 has the longest Einstein radius crossing time ever measured---641 days. Straightforward interpretation of this spectacular microlensing event indicates that the lens is either a 150 solar mass black hole at 500 pc or a 30 solar mass black hole at 6 kpc. We present the results of our deep search with the XMM-Newton and Chandra observatories for x-ray emisson from OGLE-1999-BUL-32. We also briefly discuss the constraints that our observations place on models for accretion of the interstellar medium onto isolated, intermediate mass, black holes.
McGowan Katherine E.
Vestrand Thomas W.
Wozniak Prezemyslaw R.
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