On the Geometry of the X-ray emission from pulsars a consistent inclination and beaming solution for the Be/X-ray pulsar SXP 1062

Author:

Cappallo R C12,Laycock S G T12,Christodoulou D M23ORCID,Roy A12,Bhattacharya S12,Coe M J4ORCID,Zezas A56

Affiliation:

1. Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA

2. Lowell Center for Space Science and Technology, 600 Suffolk Street, Lowell, MA 01854, USA

3. Department of Mathematical Sciences, University of Massachusetts Lowell, Lowell, MA 01854, USA

4. School of Physics and Astronomy, Southampton University, Highfield, Southampton SO17 1BJ, UK

5. Physics Department & Institute of Theoretical & Computational Physics, University of Crete, 71003 Heraklion, Crete, Greece

6. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA, 02138, USA

Abstract

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.

Funder

NASA

UMASS

Space Science and Technology

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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