On the origin of black hole spin in high-mass black hole binaries: Cygnus X-1

Details On the origin of black hole spin in high-mass black hole binaries: Cygnus X-1 On the origin of black hole spin in high-mass black hole binaries: Cygnus X-1

2010-11-19

arxiv.org/abs/1011.4528v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

5 pages, 2 tables, 1 figure. Accepted for publication in MNRAS

Scientific paper

To date, there have been several detections of high-mass black hole binaries in both the Milky Way and other galaxies. For some of these, the spin parameter of the black hole has been estimated. As many of these systems are quite tight, a suggested origin of the spin is angular momentum imparted by the synchronous rotation of the black hole progenitor with its binary companion. Using Cygnus X-1, the best studied high-mass black hole binary, we investigate this possibility. We find that such an origin of the spin is not likely, and our results point rather to the spin being the result of processes during the collapse.

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