2020ApJ...896..129C -
Astrophys. J., 896, 129-129 (2020/June-3)
Compact intermediate-mass black hole X-ray binaries: potential LISA sources?
CHEN W.-C.
Abstract (from CDS):
The scientific aim of the space gravitational-wave (GW) detector Laser Interferometer Space Antenna (LISA) that was scheduled to launch in the early 2030s is to detect the low-frequency GW signals in the Galaxy. Its main candidate GW sources are compact binaries of white dwarfs and neutron stars. In this work, we examine whether compact intermediate-mass black hole (IMBH) X-ray binaries could be potential LISA sources. Our simulations indicate that an IMBH binary with a 1000 M☉ IMBH and a 3 M☉ donor star in an initial orbital period near the so-called bifurcation period of 0.77 day could evolve into an ultra-compact X-ray binary, which will emit GW signals with a maximum frequency of 2.5 mHz. According to the evolutionary tracks of characteristic strain, IMBH X-ray binaries with the initial donor-star masses of 1-3 M☉ and the initial orbital periods slightly less than the bifurcation periods will be detectable by the LISA in a distance of 15 kpc. Assuming each of 60 Galactic globular clusters hosts a 1000 M☉ IMBH, the maximum number of compact IMBH X-ray binaries that LISA will detect in the Galaxy should be less than ten. Therefore, the detectability of compact IMBH X-ray binaries by the LISA is not optimistic.
Abstract Copyright:
© 2020. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Black holes - Gravitational waves - X-ray binary stars - Stellar evolution - Galaxy clusters
Simbad objects:
5
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2020ApJ...896..129C and select 'bookmark this link' or equivalent in the popup menu