Journal Article

The influence of outflows on <i>1/f</i>-like luminosity fluctuations

Da-Bin Lin, Wei-Min Gu, Tong Liu and Ju-Fu Lu

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 1, pages 308-313
Published in print March 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI:
The influence of outflows on 1/f-like luminosity fluctuations

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In accretion systems, outflows may have significant influence on luminosity fluctuations. In this paper, following Lyubarskii’s general scheme, we revisit the power spectral density of luminosity fluctuations by taking into account the role of outflows. Our analysis is based on the assumption that the coupling between the local outflow and inflow is weak for accretion-rate fluctuations. We find that, for inflow mass accretion rate , the power spectrum of the flicker-noise component will present a power-law distribution p(f) ∝f−(1 + 4s/3) for advection-dominated flows. We also obtain descriptions of p(f) for both standard thin discs and neutrino-cooled discs, which show that the power-law index of a neutrino-cooled disc is generally larger than that of a photon-cooled disc. Furthermore, the relationship obtained between p(f) and s indicates the possibility of evaluating the strength of outflows through the power spectrum in X-ray binaries and gamma-ray bursts. In addition, we discuss the possible influence of outflow–inflow coupling on our results.

Keywords: accretion, accretion discs; ISM: jets and outflows; X-rays: binaries

Journal Article.  3623 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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