A Search for X-Rays from the Long-Duration Microlensing Event MACHO-96-BLG-5

Details A Search for X-Rays from the Long-Duration Microlensing Event MACHO-96-BLG-5 A Search for X-Rays from the Long-Duration Microlensing Event MACHO-96-BLG-5

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...631l..65m&link_type=abstract

The Astrophysical Journal, Volume 631, Issue 1, pp. L65-L68.

Physics

5

Black Hole Physics, Stars: Individual (Macho-96-Blg-5), X-Rays: Stars

Scientific paper

MACHO-96-BLG-5 was a microlensing event of exceptionally long duration, lasting ~800 days, which is suggestive of a stellar-mass black hole for the lens. With a 9.8 ks Chandra ACIS-S observation, we detected no X-ray events associated with the position of MACHO-96-BLG-5. An upper limit is estimated as 4.6 counts at the 99% confidence level. By assuming an absorbed power law spectrum with a photon index Γ=1.4-2.0, the upper limit on the 0.3-8 keV luminosity is estimated as (7-8)×1029 ergs s-1 at an assumed distance of 1 kpc. The corresponding Eddington ratio is (8-9)×10-10 for a black hole of 6 Msolar. The luminosity is lower than observed for quiescent black hole binaries in our Galaxy and is consistent with a scenario, previously suggested by Bennett et al., in which the lens for MACHO-96-BLG-5 is an isolated stellar-mass black hole, although other possibilities are not ruled out.

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