Black Hole/Pulsar Binaries in the Galaxy

Abstract

We have performed population synthesis calculation on the formation of binaries containing a black hole (BH) and a neutron star (NS) in the Galactic disk. Some of important input parameters, especially for the treatment of common envelope evolution, are updated in the calculation. We have discussed the uncertainties from the star formation rate of the Galaxy and the velocity distribution of NS kicks on the birthrate ($\sim 0.6-13\mathrm{My}{\mathrm{r}}^{-1}$) of BH/NS binaries. From incident BH/NS binaries, by modelling the orbital evolution duo to gravitational wave radiation and the NS evolution as radio pulsars, we obtain the distributions of the observable parameters such as the orbital period, eccentricity and pulse period of the BH/pulsar binaries. We estimate that there may be $\sim 3-80$ BH/pulsar binaries in the Galactic disk and around 10\% of them could be detected by the Five-hundred-meter Aperture Spherical radio Telescope.

arXiv comment5 pages, 4 figures, 1 table, accepted for publication in MNRAS Letters

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• The FAST Galactic Plane Pulsar Snapshot survey: I. Project design and pulsar discoveries
• Host galaxies of merging compact objects: mass, star formation rate, metallicity and colours
• Modelling Neutron Star-Black Hole Binaries: Future Pulsar Surveys and Gravitational Wave Detectors
• The host galaxies of double compact objects merging in the local Universe
• Population Synthesis of Black Hole X-Ray Binaries
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• Gravitational Collider Physics via Pulsar-Black Hole Binaries II: Fine and Hyperfine Structures are Favored
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• Probing Ultralight Bosons with Compact Eccentric Binaries
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• On the Formation of SS433
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