The Mass of the Black Hole in the X-ray Binary M33 X-7 and the Evolutionary Status of M33 X-7 and IC 10 X-1

Abstract

We have analyzed the observed radial-velocity curve for the X-ray binary M33 X-7 in a Roche model. We have analyzed the dependence between the component masses and the degree of filling of the optical star's Roche lobe to obtain the ratio of the masses of the optical star and compact object. For the most probable mass of the optical star, $m_v=70M_{\odot }$, the mass of the compact object is $m_x=15.55\pm 3.20M_{\odot }$. It has been shown that black holes with masses of $m_x=15M_{\odot }$ and even higher can form in binaries. We present characteristic evolutionary tracks for binary systems passing through an evolutionary stage with properties similar to M33 X-7 - type objects. According to population-synthesis analyses, such binaries should be present in galaxies with masses of at least $10^{11}{M}_{\odot }$. The present number of such systems in M33 should be of the order of unity. We have also studied the evolutionary status of the X-ray binary IC 10 X-1 with a Wolf-Rayet component, which may contain a massive black hole. The final stages of the evolution of the M33 X-7 and IC 10 X-1 systems should be accompanied by the radiation of gravitational waves.

26 pages, 3 tables, 13 figures

References in corpus (4)

• A 15.65 solar mass black hole in an eclipsing binary in the nearby spiral galaxy Messier 33
• Particularly Efficient Star Formation in M33
• M 33 X-7: ChASeM33 reveals the first eclipsing black hole X-ray binary
• Photometric Analysis of the Optical Counterpart of the Black Hole HMXB M33 X-7

Cited by in corpus (8)

• A wide star-black-hole binary system from radial-velocity measurements
• Formation of the black-hole binary M33 X-7 via mass-exchange in a tight massive system
• The mass function of nearby black hole candidates
• The First Decade of Science with Chandra and XMM-Newton
• Phase-resolved spectroscopic analysis of the eclipsing black hole X-ray binary M33 X-7: System properties, accretion, and evolution
• Suzaku investigation into the nature of the nearest ultraluminous X-ray source, M33 X-8
• Wolf-Rayet stars, black holes and the first detected gravitational wave source
• The K-corrections to radial velocity curves of optical components in X-Ray Binaries. HMXB with weak X-ray heating