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High resolution X-ray spectroscopy of V4641 Sgr during its 2020 outburst

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
1365-2966
124 - 137
Shaw, A. W.
b19a61bb-f886-4aa7-9bec-8e4d8b6c488d
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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Shaw, A. W.
b19a61bb-f886-4aa7-9bec-8e4d8b6c488d
Miller, J.M.
be4c8f0f-91e6-47de-9d38-235a632d8b90
Grinberg, Victoria
9518df4d-f71d-45f9-bbb7-e103c3f1889c
Buisson, Douglas
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Heinke, C. O.
50442ec4-8a45-4aa5-b425-28d0c896dc08
Plotkin, R. M.
754ef328-afa6-43d9-82f5-f4a9a476659f
Tomsick, John A.
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Bahramian, A.
1f016b89-98b9-4fa9-8df0-9390fbb5eeda
Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
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), 124 - 137. (doi:10.1093/mnras/stac2213).

Record type: Article

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.

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2208.01732 - Accepted Manuscript
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stac2213 - Version of Record
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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
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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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: Poshak Gandhi ORCID iD
Author: Gregory R. Sivakoff

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