Journal Article

Ways to constrain neutron star equation of state models using relativistic disc lines

Sudip Bhattacharyya

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 4, pages 3247-3252
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18936.x
Ways to constrain neutron star equation of state models using relativistic disc lines

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Relativistic spectral lines from the accretion disc of a neutron star low-mass X-ray binary can be modelled to infer the disc inner edge radius. A small value of this radius tentatively implies that the disc terminates either at the neutron star hard surface, or at the innermost stable circular orbit (ISCO). Therefore an inferred disc inner edge radius either provides the stellar radius, or can directly constrain stellar equation of state (EoS) models using the theoretically computed ISCO radius for the space–time of a rapidly spinning neutron star. However, this procedure requires numerical computation of stellar and ISCO radii for various EoS models and neutron star configurations using an appropriate rapidly spinning stellar space–time. We have fully general relativistically calculated about 16 000 stable neutron star structures to explore and establish the above mentioned procedure, and to show that the Kerr space–time is inadequate for this purpose. Our work systematically studies the methods to constrain EoS models using relativistic disc lines, and will motivate future X-ray astronomy instruments.

Keywords: accretion, accretion discs; equation of state; methods: numerical; stars: neutron; X-rays: binaries

Journal Article.  4248 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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