Li, KJ;
Wu, K;
Leung, PK;
Singh, D;
(2021)
Relativistic scattering of a fast spinning neutron star by a massive black hole.
Monthly Notices of the Royal Astronomical Society
10.1093/mnras/stab2925.
(In press).
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Abstract
The orbital dynamics of fast spinning neutron stars encountering a massive bh with unbounded orbits are investigated using the quadratic-in-spin mpd formulation. We consider the motion of the spinning neutron stars with astrophysically relevant speed in the gravity field of the BH. For such slow-speed scattering, the hyperbolic orbits followed by these neutron stars all have near the e = 1 eccentricity, and have distinct properties compared with those of e ≫ 1. We have found that compared with geodesic motion, the spin-orbit and spin-spin coupling will lead to a variation of scattering angles at spatial infinity, and this variation is more prominent for slow-speed scattering than fast-speed scattering. Such a variation leads to an observable difference in pulse-arrival-time within a few hours of observation, and up to a few days or months for larger BH masses or longer spinning periods. Such a relativistic pulsar-BH system also emits a burst of gravitational waves (GWs) in the sensitivity band of LISA, and for optimal settings, can be seen up to 100 Mpc away. A radio follow up of such a GW burst with SKA or FAST will allow for measuring the orbital parameters with high accuracy and testing the predictions of gr.
Type: | Article |
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Title: | Relativistic scattering of a fast spinning neutron star by a massive black hole |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1093/mnras/stab2925 |
Publisher version: | https://doi.org/10.1093/mnras/stab2925 |
Language: | English |
Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
Keywords: | black hole physics, gravitation, celestial mechanics, relativistic processes, pulsars general |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
URI: | https://discovery.ucl.ac.uk/id/eprint/10137274 |
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