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

Abstract

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.

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

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• Understanding Compact Object Formation and Natal Kicks. III. The case of Cygnus X-1
• Search for ultralight bosons in Cygnus X-1 with Advanced LIGO
• The spin rate of pre-collapse stellar cores: wave-driven angular momentum transport in massive stars
• Re-estimating the Spin Parameter of the Black Hole in Cygnus X-1
• Wind mass-loss rates of stripped stars inferred from Cygnus X-1
• The Formation of Rapidly Rotating Black Holes in High Mass X-ray Binaries
• Gamma-ray Bursts Induced by Turbulent Reconnection
• Observational prospects of self-interacting scalar superradiance with next-generation gravitational-wave detectors
• The properties of long gamma-ray bursts in massive compact binaries
• An apparent positive relation between spin and orbital angular momentum in X-ray binaries
• Spectral Analysis of New Black Hole Candidate AT2019wey Observed by NuSTAR