Esposito, P and Burgay, M and Possenti, A and Turolla, R and Zane, S and De Luca, A and Tiengo, A and Israel, GL and Mattana, F and Mereghetti, S and Bailes, M and Romano, P and Götz, D and Rea, N (2009) Spin-down rate and inferred dipole magnetic field of the soft gamma-ray repeater SGR 1627-41. Monthly Notices of the Royal Astronomical Society , 399 (1) L44 - L48. 10.1111/j.1745-3933.2009.00723.x.
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Using Chandra data taken in 2008 June, we detected pulsations at 2.594 39(4) s in the soft gamma-ray repeater SGR 1627−41. This is the second measurement of the source spin period and allows us to derive for the first time a long-term spin-down rate of (1.9 ± 0.4) × 10−11 s s−1. From this value, we infer for SGR 1627−41 a characteristic age of ∼2.2 kyr, a spin-down luminosity of ∼4 × 1034 erg s−1 (one of the highest among sources of the same class), and a surface dipole magnetic field strength of ∼2 × 1014 G. These properties confirm the magnetar nature of SGR 1627−41; however, they should be considered with caution since they were derived on the basis of a period derivative measurement made using two epochs only, and magnetar spin-down rates are generally highly variable. The pulse profile, double-peaked and with a pulsed fraction of 13 ± 2 per cent in the 2–10 keV range, closely resembles that observed by XMM–Newton in 2008 September. Having for the first time a timing model for this soft gamma-ray repeater (SGR), we also searched for a pulsed signal in archival radio data collected with the Parkes radio telescope 9 months after the previous X-ray outburst. No evidence for radio pulsations was found, down to a luminosity level ∼10–20 times fainter (for a 10 per cent duty cycle and a distance of 11 kpc) than the peak luminosity shown by the known radio magnetars.
|Title:||Spin-down rate and inferred dipole magnetic field of the soft gamma-ray repeater SGR 1627-41|
|Open access status:||An open access version is available from UCL Discovery|
|Additional information:||© 2009 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org|
|Keywords:||stars: neutron, pulsars: general, X-rays: individual: SGR1627-41|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics|
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