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A new low-B magnetar: Swift J1822.3–1606

Published online by Cambridge University Press:  20 March 2013

A. Camero-Arranz ,
N. Rea ,
G. L. Israel ,
P. Esposito ,
J. A. Pons ,
R. P. Mignani ,
R. Turolla ,
S. Zane ,
M. Burgay  and
A. Possenti
...Show all authors
A. Camero-Arranz
Affiliation:
Institut de Ciències de l'Espai (CSIC-IEEC), Campus UAB, Facultat de Ciències, Torre C5-parell, E-08193 Barcelona, Spain email: [email protected]
N. Rea
Affiliation:
Institut de Ciències de l'Espai (CSIC-IEEC), Campus UAB, Facultat de Ciències, Torre C5-parell, E-08193 Barcelona, Spain email: [email protected]
G. L. Israel
Affiliation:
INAF, Osservatorio Astronomico di Roma, via Frascati 22, 00040, Monteporzio Catone, Italy
P. Esposito
Affiliation:
INAF, Osservatorio Astronomico di Cagliari, Poggio dei Pini, I-09012 Capoterra, Italy
J. A. Pons
Affiliation:
Departament de Fisica Aplicada, Univ. d'Alacant, Ap. Correus 99, 03080 Alacant, Spain
R. P. Mignani
Affiliation:
Mullard Space Science Laboratory, Univ. College London, Dorking, Surrey RH5 6NT, UK Institute of Astronomy, University of Zielona Góra, Lubuska 2, 65-265, Zielona Góra, Poland
R. Turolla
Affiliation:
Mullard Space Science Laboratory, Univ. College London, Dorking, Surrey RH5 6NT, UK Università di Padova, Dipart. di Fisica e Astronomia, via F. Marzolo 8, I-35131 Padova, Italy
S. Zane
Affiliation:
Mullard Space Science Laboratory, Univ. College London, Dorking, Surrey RH5 6NT, UK
M. Burgay
Affiliation:
INAF, Osservatorio Astronomico di Cagliari, Poggio dei Pini, I-09012 Capoterra, Italy
A. Possenti
Affiliation:
INAF, Osservatorio Astronomico di Cagliari, Poggio dei Pini, I-09012 Capoterra, Italy
S. Campana
Affiliation:
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy
T. Enoto
Affiliation:
Kavli Institute for Particle Astrophysics & Cosmology (KIPAC), SLAC/Stanford University, PO Box 20450, MS 29, Stanford, CA 94309, USA
N. Gehrels
Affiliation:
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
E. Göğüş
Affiliation:
Sabancı University, Orhanlı-Tuzla, 34956 İstanbul, Turkey
D. Götz
Affiliation:
AIM (CEA/DSM-CNRS-Université Paris Diderot), Irfu/Service d'Astrophysique, Saclay, F-91191 Gif-sur-Yvette, France
C. Kouveliotou
Affiliation:
NASA Marshall Space Flight Center, Huntsville, AL 35812, USA
K. Makishima
Affiliation:
High Energy Astrophysics Laboratory, Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan Department of Physics, Univ. of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
S. Mereghetti
Affiliation:
INAF – IASF Milano, via E. Bassini 15, I-20133 Milano, Italy
S. R. Oates
Affiliation:
Mullard Space Science Laboratory, Univ. College London, Dorking, Surrey RH5 6NT, UK
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Abstract

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We report on the long term X-ray monitoring with Swift, RXTE, Suzaku, Chandra, and XMM-Newton of the outburst of the newly discovered magnetar Swift J1822.3–1606 (SGR 1822-1606), from the first observations soon after the detection of the short X-ray bursts which led to its discovery (July 2011), through the first stages of its outburst decay (April 2012). Our X-ray timing analysis finds the source rotating with a period of P = 8.43772016(2) s and a period derivative Ṗ = 8.3(2) × 10−14 ss−1, which entails an inferred dipolar surface magnetic field of B ≃ 2.7 × 1013 G at the equator. This measurement makes Swift J1822.3–1606 the second lowest magnetic field magnetar (after SGR 0418+5729; Rea et al. 2010). Following the flux and spectral evolution from the beginning of the outburst, we find that the flux decreased by about an order of magnitude, with a subtle softening of the spectrum, both typical of the outburst decay of magnetars. By modeling the secular thermal evolution of Swift J1822.3–1606, we find that the observed timing properties of the source, as well as its quiescent X-ray luminosity, can be reproduced if it was born with a poloidal and crustal toroidal fields of Bp ~ 1.5 × 1014 G and Btor ~ 7 × 1014 G, respectively, and if its current age is ~550 kyr (Rea et al. 2012).

Keywords

stars: magnetic fields — stars: neutron — X-rays: Swift J1822.3–1606
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. 353 - 355
Copyright
Copyright © International Astronomical Union 2013

References

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