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Broadband aperiodic variability in X-ray pulsars: accretion rate fluctuations propagating under the influence of viscous diffusion

Abstract:

We investigate aperiodic X-ray flux variability in accreting highly magnetized neutron stars – X-ray pulsars (XRPs). The X-ray variability is largely determined by mass accretion rate fluctuations at the NS surface, which replicate accretion rate fluctuations at the inner radius of the accretion disc. The variability at the inner radius is due to fluctuations arising all over the disc and propagating inwards under the influence of viscous diffusion. The inner radius varies with mean mass accr...

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Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1093/mnras/stz948

Authors


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Role:
Author
ORCID:
0000-0003-4515-8955
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Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Astrophysics
Role:
Author
ORCID:
0000-0002-5311-9078
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Role:
Author
ORCID:
0000-0002-9679-0793
Publisher:
Oxford University Press
Journal:
Monthly Notices of the Royal Astronomical Society More from this journal
Volume:
486
Issue:
3
Pages:
4061–4074
Publication date:
2019-04-03
Acceptance date:
2019-04-01
DOI:
EISSN:
1365-2966
ISSN:
0035-8711
Language:
English
Keywords:
Pubs id:
pubs:994600
UUID:
uuid:d29f5932-a753-4722-a1d7-a2b1c052ed64
Local pid:
pubs:994600
Source identifiers:
994600
Deposit date:
2019-04-25

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