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SÉMINAIRE DU LERMA
OBSERVATOIRE DE PARIS
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Mecredi 3 avril 2002, à 14h 30,

77 avenue Denfert Rochereau, Paris 14

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STELLAR-MASS BLACK HOLES IN THE SOLAR NEIGHBORHOOD



Rocky Kolb

Fermilab, Chicago, USA



Résumé : We search for nearby, isolated, accreting, ``stellar-mass'' (3 to 100 solar masses) black holes. Models suggest a synchrotron spectrum in visible wavelengths and some emission in X-ray wavelengths. Of 3.7 million objects in the Sloan Digital Sky Survey Early Data Release, about 150,000 objects have colors and properties consistent with such a spectrum, and 47 of these objects are X-ray sources from the ROSAT All Sky Survey. We give the positions and colors of these 47 black-hole candidates, as well as a measure of their distances from the stellar loci in color--color space. We discuss uncertainties the expected number of sources, and the contribution of black holes to local dark matter.