Physics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...651.1092n&link_type=abstract
The Astrophysical Journal, Volume 651, Issue 2, pp. 1092-1097.
Physics
3
Black Hole Physics, Stars: Individual (Macho-96-Blg-5), X-Rays: Stars
Scientific paper
MACHO-96-BLG-5 was a microlensing event observed toward the bulge of the Galaxy with an exceptionally long duration of ~970 days. The microlensing parallax fit parameters were used to estimate a lens mass M=6+10-3 Msolar, corresponding to a distance d in the range 0.5-2 kpc. The upper limit on the absolute brightness for main-sequence stars of the same mass is less than 1 Lsolar, so the lens is a good black hole candidate. Such a black hole would accrete from the interstellar medium, thereby emitting in the X-ray band. Here we report the analysis of a deep XMM-Newton observation toward the MACHO-96-BLG-5 lens position. Only an upper limit (99.8% confidence level) to the X-ray flux from the lens position, 9.10×10-15 to 1.45×10-14 ergs cm-2 s-1 in the 0.2-10 keV energy band, is obtained, allowing us to constrain the putative black hole's accretion parameters.
de Paolis Francesco
de Plaa Jelle
Elia Davide
Ingrosso Gabriele
Kaastra Jelle S.
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