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Super-Eddington accretion discs with advection and outflows around magnetized neutron stars

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arxiv 1902.04609 v1 pith:4HAOJTP4 submitted 2019-02-12 astro-ph.HE

Anna Chashkina , Galina Lipunova , Pavel Abolmasov , Juri Poutanen This is my paper · ORCID
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keywords accretiondiscmodelradiusadvectioneddingtonmagnetizedmagnetospheric
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We present a model for a super-Eddington accretion disc around a magnetized neutron star taking into account advection of heat and the mass loss by the wind. The model is semi-analytical and predicts radial profiles of all basic physical characteristics of the accretion disc. The magnetospheric radius is found as an eigenvalue of the problem. When the inner disc is in radiation-pressure-dominated regime but does not reach its local Eddington limit, advection is mild, and the radius of the magnetosphere depends weakly on the accretion rate. Once approaching the local Eddington limit, the disc becomes advection-dominated, and the scaling for the magnetospheric radius with the mass accretion rate is similar to the classical Alfven relation. Allowing for the mass loss in a wind leads to an increase of the magnetospheric radius. Our model may be applied to a large variety of magnetized neutron stars accreting close to or above their Eddington limits: ultra-luminous X-ray pulsars, Be/X-ray binaries in outbursts, and other systems. In the context of our model we discuss the observational properties of NGC 5907~X-1, the brightest ultra-luminous pulsar known so far, and NGC 300~ULX-1 which is apparently a Be/X-ray binary experiencing a very bright super-Eddington outburst.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The X-ray emission of the long-period transient and accreting cataclysmic variable ASKAP J174508.9-505149

    astro-ph.HE 2026-06 unverdicted novelty 6.0 of 10

    X-ray timing and spectral analysis of ASKAP J174508.9-505149 detects matching periodicity and features consistent with an accreting magnetic CV.

  2. X-Ray Views of Galactic Accreting Pulsars in High-Mass X-Ray Binaries

    astro-ph.HE 2024-12 accept novelty 1.0 of 10

    A concise review of the timing, spectral, and polarization properties of accreting X-ray pulsars in high-mass X-ray binaries, including recent IXPE results.

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