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The new magnetar Swift J1822.3–1606

Published online by Cambridge University Press:  20 March 2013

P. Scholz ,
C.-Y. Ng ,
M. A. Livingstone ,
V. M. Kaspi ,
A. Cumming  and
R. Archibald
P. Scholz
Affiliation:
Department of Physics, Rutherford Physics Building, McGill University3600 University Street, Montreal, Quebec, H3A 2T8, Canada email: pscholz@physics.mcgill.ca
C.-Y. Ng
Affiliation:
Department of Physics, Rutherford Physics Building, McGill University3600 University Street, Montreal, Quebec, H3A 2T8, Canada email: pscholz@physics.mcgill.ca
M. A. Livingstone
Affiliation:
Department of Physics, Rutherford Physics Building, McGill University3600 University Street, Montreal, Quebec, H3A 2T8, Canada email: pscholz@physics.mcgill.ca
V. M. Kaspi
Affiliation:
Department of Physics, Rutherford Physics Building, McGill University3600 University Street, Montreal, Quebec, H3A 2T8, Canada email: pscholz@physics.mcgill.ca
A. Cumming
Affiliation:
Department of Physics, Rutherford Physics Building, McGill University3600 University Street, Montreal, Quebec, H3A 2T8, Canada email: pscholz@physics.mcgill.ca
R. Archibald
Affiliation:
Department of Physics, Rutherford Physics Building, McGill University3600 University Street, Montreal, Quebec, H3A 2T8, Canada email: pscholz@physics.mcgill.ca
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Abstract

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On 2011 July 14, a transient X-ray source, Swift J1822.3–1606, was detected by Swift BAT via its burst activities. It was subsequently identified as a new magnetar upon the detection of a pulse period of 8.4 s. Using follow-up RXTE, Swift, and Chandra observations, we have determined a spin-down rate of Ṗ ~ 3 × 10−13, implying a dipole magnetic field of ~ 5 × 1013 G, second lowest among known magnetars, although our timing solution is contaminated by timing noise. The post-outburst flux evolution is well modelled by surface cooling resulting from heat injection in the outer crust, although we cannot rule out other models. We measure an absorption column density similar to that of the open cluster M17 at 10′ away, arguing for a comparable distance of ~1.6 kpc. If confirmed, this could be the nearest known magnetar.

Keywords

pulsars: individual (Swift J1822.3–1606)stars: neutronX-rays: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 486 - 488
Copyright
Copyright © International Astronomical Union 2013

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