Investigating the ultra-compact x-ray binary candidate SLX 1735-269 with NICER and NuSTAR
Investigating the ultra-compact x-ray binary candidate SLX 1735-269 with NICER and NuSTAR
e present two simultaneous NICER and NuSTAR observations of the ultracompact X-ray binary (UCXB) candidate SLX 1735−269 while the source was in two different spectral states. Using various reflection modeling techniques, we find that xillverCO, a model used for fitting X-ray spectra of UCXBs with high carbon and oxygen abundances is an improvement over relxill or relxillNS, which instead contains solar-like chemical abundances. This provides indirect evidence in support of the source being ultracompact. We also use this reflection model to get a preliminary measurement of the inclination of the system, i=57+23−7 degrees. This is consistent with our timing analysis, where a lack of eclipses indicates an inclination of i < 80°. The timing analysis is otherwise inconclusive, and we cannot confidently measure the orbital period of the system.
astro-ph.HE
Moutard, D.L.
6de70db1-fb22-4580-a6bd-61daccebc919
Ludlam, R.M.
b27b6ff8-9743-49f2-833a-115803efa43a
Sudha, Malu
13e9475d-2d80-4a98-a1b5-05fe4cef9eb3
Cackett, E.M.
db500756-c971-444b-9677-4ee742b2dac5
Degenaar, N.
347a2379-6b78-482e-976c-52f08a96114d
Fabian, A.C.
b9bef0bc-2ecd-49dc-ab2b-954cabea88ba
Gandhi, P.
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Garcia, J.A.
308827a0-b554-4b58-8221-3b9ed69d99f6
Shaw, A.W.
ec30710a-0499-4f4f-9685-4510f75efe79
Tomsick, J.A.
96b2e8cc-70c1-424a-8380-2551a5077ff5
11 June 2024
Moutard, D.L.
6de70db1-fb22-4580-a6bd-61daccebc919
Ludlam, R.M.
b27b6ff8-9743-49f2-833a-115803efa43a
Sudha, Malu
13e9475d-2d80-4a98-a1b5-05fe4cef9eb3
Cackett, E.M.
db500756-c971-444b-9677-4ee742b2dac5
Degenaar, N.
347a2379-6b78-482e-976c-52f08a96114d
Fabian, A.C.
b9bef0bc-2ecd-49dc-ab2b-954cabea88ba
Gandhi, P.
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Garcia, J.A.
308827a0-b554-4b58-8221-3b9ed69d99f6
Shaw, A.W.
ec30710a-0499-4f4f-9685-4510f75efe79
Tomsick, J.A.
96b2e8cc-70c1-424a-8380-2551a5077ff5
Moutard, D.L., Ludlam, R.M., Sudha, Malu, Cackett, E.M., Degenaar, N., Fabian, A.C., Gandhi, P., Garcia, J.A., Shaw, A.W. and Tomsick, J.A.
(2024)
Investigating the ultra-compact x-ray binary candidate SLX 1735-269 with NICER and NuSTAR.
The Astrophysical Journal, 968, [51].
(doi:10.48550/arXiv.2401.12371).
Abstract
e present two simultaneous NICER and NuSTAR observations of the ultracompact X-ray binary (UCXB) candidate SLX 1735−269 while the source was in two different spectral states. Using various reflection modeling techniques, we find that xillverCO, a model used for fitting X-ray spectra of UCXBs with high carbon and oxygen abundances is an improvement over relxill or relxillNS, which instead contains solar-like chemical abundances. This provides indirect evidence in support of the source being ultracompact. We also use this reflection model to get a preliminary measurement of the inclination of the system, i=57+23−7 degrees. This is consistent with our timing analysis, where a lack of eclipses indicates an inclination of i < 80°. The timing analysis is otherwise inconclusive, and we cannot confidently measure the orbital period of the system.
Text
2401.12371v1
- Author's Original
Available under License Other.
Text
2401.12371v2
- Accepted Manuscript
Available under License Other.
Text
Moutard_2024_ApJ_968_51
- Version of Record
More information
Submitted date: 22 January 2024
Accepted/In Press date: 10 May 2024
e-pub ahead of print date: 11 June 2024
Published date: 11 June 2024
Additional Information:
Douglas JK Buisson was a co-author on the original submitted paper, available on ArXiv.
Keywords:
astro-ph.HE
Identifiers
Local EPrints ID: 487409
URI: http://eprints.soton.ac.uk/id/eprint/487409
ISSN: 0004-637X
PURE UUID: 9bb8b26e-2c44-4e3b-8473-e3a402471b41
Catalogue record
Date deposited: 20 Feb 2024 12:45
Last modified: 22 Aug 2025 02:12
Export record
Altmetrics
Contributors
Author:
D.L. Moutard
Author:
R.M. Ludlam
Author:
Malu Sudha
Author:
E.M. Cackett
Author:
N. Degenaar
Author:
A.C. Fabian
Author:
J.A. Garcia
Author:
A.W. Shaw
Author:
J.A. Tomsick
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
