On the Geometry of the X-ray emission from pulsars a consistent inclination and beaming solution for the Be/X-ray pulsar SXP 1062
On the Geometry of the X-ray emission from pulsars a consistent inclination and beaming solution for the Be/X-ray pulsar SXP 1062
SXP 1062 is a long-period X-ray pulsar (XRP) with a Be optical companion located in the Small Magellanic Cloud. First discovered in 2010 from XMM–Newton data, it has been the target of multiple observational campaigns due to the seeming incongruity between its long spin period and recent birth. In our continuing modelling efforts to determine the inclination angle (i) and magnetic axis angle (θ) of XRPs, we have fitted 19 pulse profiles from SXP 1062 with our pulsar model, Polestar, including three consecutive Chandra observations taken during the trailing end of a Type I outburst. These fittings have resulted in most likely values of i = 76○ ± 2○ and θ = 40○ ± 9○. SXP 1062 mostly displays a stable double-peaked pulse profile with the peaks separated by roughly a third of a phase, but recently the pulsar has spun up and widened to a spacing of roughly half of a phase, yet the Polestar fits for i and θ remain constant. Additionally, we note a possible correlation between the X-ray luminosity and the separation of the peaks in the pulse profiles corresponding to the highest luminosity states.
Accretion, Accretion discs, Methods: Numerical, Pulsars: General, Stars: Magnetic field, Stars: Neutron, X-rays: Binaries
2152–2161
Capallo, R.C.
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Laycock, S.G.T.
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Christodoulou, D.M.
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Roy, A.
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Bhattacharya, S.
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Coe, Malcolm
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Zezas, A.
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1 June 2020
Capallo, R.C.
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Laycock, S.G.T.
dcc0a71c-272a-4f58-b4bb-69accffcf485
Christodoulou, D.M.
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Roy, A.
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Bhattacharya, S.
d06038bd-c92a-4838-a01d-3ab58eaa715a
Coe, Malcolm
04dfb23b-1456-46a3-9242-5cee983471d5
Zezas, A.
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Capallo, R.C., Laycock, S.G.T., Christodoulou, D.M., Roy, A., Bhattacharya, S., Coe, Malcolm and Zezas, A.
(2020)
On the Geometry of the X-ray emission from pulsars a consistent inclination and beaming solution for the Be/X-ray pulsar SXP 1062.
Monthly Notices of the Royal Astronomical Society, 495 (2), .
(doi:10.1093/mnras/staa1320).
Abstract
SXP 1062 is a long-period X-ray pulsar (XRP) with a Be optical companion located in the Small Magellanic Cloud. First discovered in 2010 from XMM–Newton data, it has been the target of multiple observational campaigns due to the seeming incongruity between its long spin period and recent birth. In our continuing modelling efforts to determine the inclination angle (i) and magnetic axis angle (θ) of XRPs, we have fitted 19 pulse profiles from SXP 1062 with our pulsar model, Polestar, including three consecutive Chandra observations taken during the trailing end of a Type I outburst. These fittings have resulted in most likely values of i = 76○ ± 2○ and θ = 40○ ± 9○. SXP 1062 mostly displays a stable double-peaked pulse profile with the peaks separated by roughly a third of a phase, but recently the pulsar has spun up and widened to a spacing of roughly half of a phase, yet the Polestar fits for i and θ remain constant. Additionally, we note a possible correlation between the X-ray luminosity and the separation of the peaks in the pulse profiles corresponding to the highest luminosity states.
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An Active Silicon Interposer With Low-Power Hybrid Wireless-Wired Clock Distribution Network for Many-Core Systems
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More information
Accepted/In Press date: 7 May 2020
e-pub ahead of print date: 14 May 2020
Published date: 1 June 2020
Additional Information:
Funding Information:
This work was facilitated by NASA ADAP grants NNX14-AF77G and 80NSSC18K0430, with UMASS Lowell in conjunction with LoCSST (Lowell Center for Space Science and Technology). The authors would also like to thank J. Hong, H. Klus, and P. Kretschmar for their helpful discussions.
Publisher Copyright:
© 2020 The Author(s).
Keywords:
Accretion, Accretion discs, Methods: Numerical, Pulsars: General, Stars: Magnetic field, Stars: Neutron, X-rays: Binaries
Identifiers
Local EPrints ID: 443056
URI: http://eprints.soton.ac.uk/id/eprint/443056
ISSN: 1365-2966
PURE UUID: 7a542185-5110-4280-bea9-2ea670f7bcac
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Date deposited: 07 Aug 2020 16:30
Last modified: 17 Mar 2024 02:33
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Contributors
Author:
R.C. Capallo
Author:
S.G.T. Laycock
Author:
D.M. Christodoulou
Author:
A. Roy
Author:
S. Bhattacharya
Author:
A. Zezas
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