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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.
astro-ph.HE
1745-3925
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.
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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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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
26dfa223-df20-4ae1-98cc-7900dfe49fa3
Degenaar, N. D.
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Eijnden, J. van den
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Fogantini, F. A.
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Gandhi, P.
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Knigge, C.
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Muñoz-Darias, T.
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Arabacı, M. Özbey
80104684-37f3-4692-bf31-56825d3e4883
Vincentelli, F. M.
6059e516-6e7a-4d18-afa4-c5b68a3b207a

Buisson, D. J. K., Altamirano, D., Trigo, M. Díaz, Mendez, M., Padilla, M. Armas, Segura, N. Castro, Degenaar, N. D., Eijnden, J. van den, Fogantini, F. A., Gandhi, P., Knigge, C., Muñoz-Darias, T., Arabacı, M. Özbey and Vincentelli, F. M. (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. (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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Soft X-ray emission lines in the X-ray binary Swift - Version of Record
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Published date: 28 July 2020
Additional Information: 10 pages, 7 figures, MNRAS accepted
Keywords: astro-ph.HE

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Local EPrints ID: 443650
URI: http://eprints.soton.ac.uk/id/eprint/443650
ISSN: 1745-3925
PURE UUID: aae85fbc-9b77-4b2c-befb-e576a2df2be8
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: 07 Sep 2020 16:30
Last modified: 08 Sep 2020 01:41

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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. 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

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