Mon. Not. R. Astron. Soc., 399, L44-L48 (2009/October-2)
Spin-down rate and inferred dipole magnetic field of the soft gamma-ray repeater SGR1627-41.
ESPOSITO P., BURGAY M., POSSENTI A., TUROLLA R., ZANE S., DE LUCA A., TIENGO A., ISRAEL G.L., MATTANA F., MEREGHETTI S., BAILES M., ROMANO P., GOTZ D. and REA N.
Abstract (from CDS):
Using Chandra data taken in 2008 June, we detected pulsations at 2.59439(4) s in the soft gamma-ray repeater SGR1627-41. 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)x10–11s/s. From this value, we infer for SGR1627-41 a characteristic age of ∼2.2 kyr, a spin-down luminosity of ∼4x1034 erg/s (one of the highest among sources of the same class), and a surface dipole magnetic field strength of ∼2x1014 G. These properties confirm the magnetar nature of SGR1627-41; 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.
© 2009 The Authors. Journal compilation © 2009 RAS
stars: neutron - pulsars: general - X-rays: individual: SGR1627-41
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