Mass and spin measurements of black hole and neutron stars X-ray binaries through axisymmetric oscillation modes of thick torus

ABSTRACT This paper examines the oscillatory behaviour of relativistic, non-self-gravitating, charged-fluid toroidal structures within the context of the Kerr metric. The primary objective is to explore how thick accretion discs influence the mass and spin measurements of black holes and neutron sta...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2024-11, Vol.535 (1), p.612-620
Main Author: Trova, Audrey
Format: Article
Language:English
Subjects:
Accretion disks
Angular momentum
Binary stars
Black holes
Gravitation
Neutron stars
Oscillation modes
Quasi-Periodic Oscillations
Relativistic effects
Stellar oscillations
Toruses
X ray binaries
X ray stars
X-ray astronomy
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Summary:ABSTRACT This paper examines the oscillatory behaviour of relativistic, non-self-gravitating, charged-fluid toroidal structures within the context of the Kerr metric. The primary objective is to explore how thick accretion discs influence the mass and spin measurements of black holes and neutron stars in low-mass X-ray binaries (LMXBs) through quasi-periodic oscillations (QPOs) models. To achieve this, we conduct a local analysis within a general relativistic framework, determining the radial epicyclic and orbital frequencies in a perfect fluid disc. The tori are modelled using a non-Keplerian distribution of specific angular momentum, and we analyse how the oscillation properties depend on the model’s angular momentum distribution parameters. Subsequently, we connect these oscillatory frequencies to high-frequency QPOs observed in LMXBs, enabling us to calculate the optimal mass and spin values for each studied source.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stae2393