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Expanding hot flow in the black hole binary SWIFT J1753.5-0127: evidence from optical timing

Expanding hot flow in the black hole binary SWIFT J1753.5-0127: evidence from optical timing
Expanding hot flow in the black hole binary SWIFT J1753.5-0127: evidence from optical timing
We describe the evolution of optical and X-ray temporal characteristics during the outburst decline of the black hole X-ray binary SWIFT J1753.5-0127. The optical/X-ray cross-correlation function demonstrates a single positive correlation at the outburst peak, then it has multiple dips and peaks during the decline stage, which are then replaced by the precognition dip plus peak structure in the outburst tail. Power spectral densities and phase lags show a complex evolution, revealing the presence of intrinsically connected optical and X-ray quasi-periodic oscillations. For the first time, we quantitatively explain the evolution of these timing properties during the entire outburst within one model, the essence of which is the expansion of the hot accretion flow towards the tail of the outburst. The pivoting of the spectrum produced by synchrotron Comptonization in the hot flow is responsible for the appearance of the anticorrelation with the X-rays and for the optical quasi-periodic oscillations. Our model reproduces well the cross-correlation and phase lag spectrum during the decline stage, which could not be understood with any model proposed before.
accretion, accretion discs, black hole physics, stars: individual: SWIFT J1753.5-0127, X-rays: binaries
0035-8711
48-59
Veledina, Alexandra
6235d7df-e2e2-4c4b-907b-a5cafafe60ce
Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Hynes, Robert
49c31d18-e4fb-4f82-a093-dadb876d135b
Kajava, Jari J. E.
2942eaa2-ef0e-4793-8436-b5c1f5d3b9d9
Tsygankov, Sergey S.
057cc7f1-1bb8-463f-9c47-58f6ffda97b9
Revnivtsev, Michail G.
7522a59e-59ff-4890-b859-604d3f315782
Durant, Martin
d3723db5-52eb-44f6-a08f-361ace0b7698
Poutanen, Juri
93d3d495-82be-485b-b463-9956913f78a0
Veledina, Alexandra
6235d7df-e2e2-4c4b-907b-a5cafafe60ce
Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Hynes, Robert
49c31d18-e4fb-4f82-a093-dadb876d135b
Kajava, Jari J. E.
2942eaa2-ef0e-4793-8436-b5c1f5d3b9d9
Tsygankov, Sergey S.
057cc7f1-1bb8-463f-9c47-58f6ffda97b9
Revnivtsev, Michail G.
7522a59e-59ff-4890-b859-604d3f315782
Durant, Martin
d3723db5-52eb-44f6-a08f-361ace0b7698
Poutanen, Juri
93d3d495-82be-485b-b463-9956913f78a0

Veledina, Alexandra, Gandhi, Poshak, Hynes, Robert, Kajava, Jari J. E., Tsygankov, Sergey S., Revnivtsev, Michail G., Durant, Martin and Poutanen, Juri (2017) Expanding hot flow in the black hole binary SWIFT J1753.5-0127: evidence from optical timing. Monthly Notices of the Royal Astronomical Society, 470 (1), 48-59. (doi:10.1093/mnras/stx1207).

Record type: Article

Abstract

We describe the evolution of optical and X-ray temporal characteristics during the outburst decline of the black hole X-ray binary SWIFT J1753.5-0127. The optical/X-ray cross-correlation function demonstrates a single positive correlation at the outburst peak, then it has multiple dips and peaks during the decline stage, which are then replaced by the precognition dip plus peak structure in the outburst tail. Power spectral densities and phase lags show a complex evolution, revealing the presence of intrinsically connected optical and X-ray quasi-periodic oscillations. For the first time, we quantitatively explain the evolution of these timing properties during the entire outburst within one model, the essence of which is the expansion of the hot accretion flow towards the tail of the outburst. The pivoting of the spectrum produced by synchrotron Comptonization in the hot flow is responsible for the appearance of the anticorrelation with the X-rays and for the optical quasi-periodic oscillations. Our model reproduces well the cross-correlation and phase lag spectrum during the decline stage, which could not be understood with any model proposed before.

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Accepted/In Press date: 15 November 2016
e-pub ahead of print date: 17 May 2017
Published date: 1 September 2017
Keywords: accretion, accretion discs, black hole physics, stars: individual: SWIFT J1753.5-0127, X-rays: binaries

Identifiers

Local EPrints ID: 413154
URI: http://eprints.soton.ac.uk/id/eprint/413154
ISSN: 0035-8711
PURE UUID: 511ca269-f823-4d06-a8a5-3114fb030545
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 16 Aug 2017 16:30
Last modified: 07 Oct 2020 02:06

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