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Strong surface outflows on accretion discs

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journal contribution
posted on 30.04.2020, 08:57 by CJ Nixon, JE Pringle
In order to provide an explanation for the unexpected radial brightness distribution of the steady accretion discs seen in nova-like variables, we have recently proposed that the accretion energy is redistributed outwards by means of strong, magnetically driven surface flows. In this paper we note that the "powerful, rotating disc winds" observed in the soft states of black hole X-ray binaries, and also in the disc around a magnetised neutron star in Her X-1, have the properties of the outflows we recently postulated to exist in the nova-like variable accretion discs around white dwarfs. The relevant properties are that the flows are not winds, but are instead bound flows (travelling at less than the escape velocity) and that the mass fluxes in the flows are a substantial fraction of the accretion rate in the disc.

Funding

CJN is supported by the Science and Technology Facilities Council (Grant number ST/M005917/1).

History

Citation

Astronomy and Astrophysics, 636 (2020) A34

Version

VoR (Version of Record)

Published in

Astronomy and Astrophysics

Volume

636

Pagination

A34 - A34

Publisher

EDP Sciences

issn

0004-6361

eissn

1432-0746

Acceptance date

03/03/2020

Copyright date

2020

Available date

10/04/2020

Publisher version

https://www.aanda.org/articles/aa/abs/2020/04/aa37772-20/aa37772-20.html

Language

en