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Black holes formed by direct collapse: observational evidences

Published online by Cambridge University Press:  23 June 2017

I. F. Mirabel
I. F. Mirabel*
Affiliation:
Institute of Astronomy and Space Physics. CONICET - Universidad de Buenos Aires, Ciudad Universitaria, Av. Cantilo S/N, 1428 Buenos Aires - Argentina email: [email protected] Laboratoire AIM-Paris-Saclay, CEA/DSM/Irfu-CNRS, CEA-Saclay, pt courrier 131, 91191 Gif-sur-Yvette, France email: [email protected]
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Abstract

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Binary black holes as the recently detected sources of gravitational waves can be formed from massive stellar binaries in the field or by dynamical interactions in clusters of high stellar density, if the black holes are the remnants of massive stars that collapsed without natal kicks that would disrupt the binary system or eject the black holes from the cluster before binary black hole formation. Here are summarized and discussed the kinematics in three dimensions of space of five Galactic black hole X-ray binaries. For Cygnus X-1 and GRS 1915+105 it is found that the black holes of ~15 M⊙ and ~10 M⊙ in these sources were formed in situ, without energetic kicks. These observations suggest that binary black holes with components of ~10 M⊙ may have been prolifically produced in the universe.

Keywords

black hole physicsgravitational wavesX-rays: binariessupernovae: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S324: New Frontiers in Black Hole Astrophysics , September 2016 , pp. 303 - 306
Copyright
Copyright © International Astronomical Union 2017 

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