An ACIS Look at MACHO-99-BLG-22:AN Intermediate Mass Black Hole on Our Doorstep?

Details An ACIS Look at MACHO-99-BLG-22:AN Intermediate Mass Black Hole on Our Doorstep? An ACIS Look at MACHO-99-BLG-22:AN Intermediate Mass Black Hole on Our Doorstep?

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1121r&link_type=abstract

Chandra Proposal ID #03408111

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Chandra Proposal Id #03408111

Scientific paper

We request a 20ks ACIS-S observation at the position of the longest ever detected microlensing event, MACHO-99-BLG-22. A likelyhood analysis of the lensing event shows that the lens is either a stellar mass black hole (BH) in the Galactic bulge, *or* an intermediate mass BH about 500pc from us. Constraints from an old ROSAT-PSPC observation are uninteresting (F_X<2*10^-13 erg/cm^2/s). However, Chandra will be able to easily detect radiatively-efficient Bondi-Hoyle accretion onto the BH. Even in the "worst case" of accretion from the hot ISM with a column density of 1e21/cm^2 and a bolometric correction of 10, we would expect to detect 20 photons. On the other hand, it is very unlikely that a stellar mass BH in the bulge would be detectable. The requested observation, therefore, provides a powerful way of determining whether the lensing object really is an intermediate mass BH on our doorstep.

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