High resolution X-ray spectroscopy of V4641 Sgr during its 2020 outburst
High resolution X-ray spectroscopy of V4641 Sgr during its 2020 outburst
We observed the Galactic black hole X-ray binary V4641 Sgr with the high resolution transmission gratings on Chandra during the source’s 2020 outburst. Over two epochs of Chandra gratings observations, we see numerous highly ionized metal lines, superimposed on a hot, disc-dominated X-ray continuum. The measured inner disc temperatures and luminosities imply an unfeasibly small inner disc radius, such that we suggest that the central engine of V4641 Sgr is obscured, and we are viewing scattered X-rays. We find that the emission lines in the Chandra spectra cannot be constrained by a single photoionized model, instead finding that two separate photoionized model components are required, one to reproduce the iron lines and a second for the other metals. We compare the observed X-ray spectra of V4641 Sgr to optical studies during previous outbursts of the source, suggesting that the lines originate in an accretion disc wind, potentially with a spherical geometry.
accretion, accretion discs, line: identification, plasmas, X-rays: binaries, X-rays: individual: V4641 Sgr
124 - 137
Shaw, A. W.
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Miller, J.M.
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Grinberg, Victoria
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Buisson, Douglas
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Heinke, C. O.
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Plotkin, R. M.
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Tomsick, John A.
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Bahramian, A.
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Gandhi, Poshak
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Sivakoff, Gregory R.
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23 August 2022
Shaw, A. W.
b19a61bb-f886-4aa7-9bec-8e4d8b6c488d
Miller, J.M.
be4c8f0f-91e6-47de-9d38-235a632d8b90
Grinberg, Victoria
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Buisson, Douglas
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Heinke, C. O.
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Plotkin, R. M.
754ef328-afa6-43d9-82f5-f4a9a476659f
Tomsick, John A.
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Bahramian, A.
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Gandhi, Poshak
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Sivakoff, Gregory R.
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Shaw, A. W., Miller, J.M., Grinberg, Victoria, Buisson, Douglas, Heinke, C. O., Plotkin, R. M., Tomsick, John A., Bahramian, A., Gandhi, Poshak and Sivakoff, Gregory R.
(2022)
High resolution X-ray spectroscopy of V4641 Sgr during its 2020 outburst.
Monthly Notices of the Royal Astronomical Society, 516 (1), .
(doi:10.1093/mnras/stac2213).
Abstract
We observed the Galactic black hole X-ray binary V4641 Sgr with the high resolution transmission gratings on Chandra during the source’s 2020 outburst. Over two epochs of Chandra gratings observations, we see numerous highly ionized metal lines, superimposed on a hot, disc-dominated X-ray continuum. The measured inner disc temperatures and luminosities imply an unfeasibly small inner disc radius, such that we suggest that the central engine of V4641 Sgr is obscured, and we are viewing scattered X-rays. We find that the emission lines in the Chandra spectra cannot be constrained by a single photoionized model, instead finding that two separate photoionized model components are required, one to reproduce the iron lines and a second for the other metals. We compare the observed X-ray spectra of V4641 Sgr to optical studies during previous outbursts of the source, suggesting that the lines originate in an accretion disc wind, potentially with a spherical geometry.
Text
2208.01732
- Accepted Manuscript
Text
stac2213
- Version of Record
Available under License Other.
More information
Accepted/In Press date: 2 August 2022
Published date: 23 August 2022
Additional Information:
arXiv:2208.01732
Keywords:
accretion, accretion discs, line: identification, plasmas, X-rays: binaries, X-rays: individual: V4641 Sgr
Identifiers
Local EPrints ID: 470738
URI: http://eprints.soton.ac.uk/id/eprint/470738
ISSN: 1365-2966
PURE UUID: 9fe22d1c-efe6-4e2e-90ad-d32ef6e125d8
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Date deposited: 19 Oct 2022 16:32
Last modified: 17 Mar 2024 03:36
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Contributors
Author:
A. W. Shaw
Author:
J.M. Miller
Author:
Victoria Grinberg
Author:
Douglas Buisson
Author:
C. O. Heinke
Author:
R. M. Plotkin
Author:
John A. Tomsick
Author:
A. Bahramian
Author:
Gregory R. Sivakoff
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