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Soft X-ray emission lines in the X-ray binary Swift J1858.6-0814 observed with XMM-Newton-RGS: disc atmosphere or wind?

Soft X-ray emission lines in the X-ray binary Swift J1858.6-0814 observed with XMM-Newton-RGS: disc atmosphere or wind?
Soft X-ray emission lines in the X-ray binary Swift J1858.6-0814 observed with XMM-Newton-RGS: disc atmosphere or wind?
We find soft X-ray emission lines from the X-ray binary Swift J1858.6-0814 in data from XMM-Newton-RGS: N VII, O VII and O VIII, as well as notable residuals short of a detection at Ne IX and other higher ionisation transitions. These could be associated with the disc atmosphere, as in accretion disc corona sources, or with a wind, as has been detected in Swift J1858.6-0814 in emission lines at optical wavelengths. Indeed, the N VII line is redshifted, consistent with being the emitting component of a P-Cygni profile. We find that the emitting plasma has an ionisation parameter $\log(\xi)=1.35\pm0.2$ and a density $n>1.5\times10^{11}$ cm$^{-3}$. From this, we infer that the emitting plasma must be within $10^{13}$ cm of the ionising source, $\sim5\times10^{7}r_{\rm g}$ for a $1.4M_{\odot}$ neutron star, and from the line width that it is at least $10^4r_{\rm g}$ away ($2\times10^{9}(M/1.4M_{\odot})$ cm). We compare this with known classes of emission line regions in other X-ray binaries and active galactic nuclei.
1745-3925
68-76
Buisson, D.J.K.
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Altamirano, D.
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Trigo, M. Díaz
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Mendez, M.
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Padilla, M. Armas
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Segura, N. Castro
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Degenaar, N.D.
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Eijnden, J. van den
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Fogantini, F.A.
e0f2ad89-d471-4d15-8968-4664278cc617
Gandhi, P.
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Knigge, C.
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Muñoz-Darias, T.
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Arabacı, M. Özbey
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Vincentelli, F.M.
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et al.
Buisson, D.J.K.
f96b1210-d056-4948-9e4a-deeb669e6d1a
Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Trigo, M. Díaz
4d19116f-45a5-46fe-af82-20f321f4adf0
Mendez, M.
d28e6a32-ba07-4267-a01c-a349f674b3ad
Padilla, M. Armas
4ce03893-aeb1-4748-979d-a0c5769e1e0d
Segura, N. Castro
0dee6349-38d9-4a0e-b389-df77063638d5
Degenaar, N.D.
7ea2cab6-eecf-4498-87db-89f9b64f2104
Eijnden, J. van den
abb08069-7f5c-430a-a68f-6ff0bb0d920a
Fogantini, F.A.
e0f2ad89-d471-4d15-8968-4664278cc617
Gandhi, P.
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Muñoz-Darias, T.
3ce85aef-763c-4783-a13e-586115731bc2
Arabacı, M. Özbey
80104684-37f3-4692-bf31-56825d3e4883
Vincentelli, F.M.
6059e516-6e7a-4d18-afa4-c5b68a3b207a

Buisson, D.J.K., Altamirano, D. and Trigo, M. Díaz , et al. (2020) Soft X-ray emission lines in the X-ray binary Swift J1858.6-0814 observed with XMM-Newton-RGS: disc atmosphere or wind? Monthly Notices of the Royal Astronomical Society: Letters, 498 (1), 68-76. (doi:10.1093/mnras/staa2258).

Record type: Article

Abstract

We find soft X-ray emission lines from the X-ray binary Swift J1858.6-0814 in data from XMM-Newton-RGS: N VII, O VII and O VIII, as well as notable residuals short of a detection at Ne IX and other higher ionisation transitions. These could be associated with the disc atmosphere, as in accretion disc corona sources, or with a wind, as has been detected in Swift J1858.6-0814 in emission lines at optical wavelengths. Indeed, the N VII line is redshifted, consistent with being the emitting component of a P-Cygni profile. We find that the emitting plasma has an ionisation parameter $\log(\xi)=1.35\pm0.2$ and a density $n>1.5\times10^{11}$ cm$^{-3}$. From this, we infer that the emitting plasma must be within $10^{13}$ cm of the ionising source, $\sim5\times10^{7}r_{\rm g}$ for a $1.4M_{\odot}$ neutron star, and from the line width that it is at least $10^4r_{\rm g}$ away ($2\times10^{9}(M/1.4M_{\odot})$ cm). We compare this with known classes of emission line regions in other X-ray binaries and active galactic nuclei.

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More information

Accepted/In Press date: 25 July 2020
Published date: 6 August 2020

Identifiers

Local EPrints ID: 489481
URI: http://eprints.soton.ac.uk/id/eprint/489481
ISSN: 1745-3925
PURE UUID: 7b7de306-f775-4a93-b769-11274c0d2d14
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074
ORCID for P. Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 25 Apr 2024 16:32
Last modified: 27 Apr 2024 01:53

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Contributors

Author: D.J.K. Buisson
Author: D. Altamirano ORCID iD
Author: M. Díaz Trigo
Author: M. Mendez
Author: M. Armas Padilla
Author: N. Castro Segura
Author: N.D. Degenaar
Author: J. van den Eijnden
Author: F.A. Fogantini
Author: P. Gandhi ORCID iD
Author: C. Knigge
Author: T. Muñoz-Darias
Author: M. Özbey Arabacı
Author: F.M. Vincentelli
Corporate Author: et al.

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