Esposito, P. 2009 SGR 1627-41的spin-down rate和磁场强度

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Title:		Spin-down rate and inferred dipole magnetic field of the soft gamma-ray repeater SGR 1627-41
Authors:		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.; Götz, D.; Rea, N.
Publication:		eprint arXiv:0907.2873
Publication Date:		07/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		5 pages, 2 figures; accepted for publication in MNRAS Letters
Bibliographic Code:		2009arXiv0907.2873E

Abstract

Using Chandra data taken on 2008 June, we detected pulsations at 2.59439(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)E-11 s/s. From this value we infer for SGR 1627-41 a characteristic age of 2.2 kyr, a spin-down luminosity of 4E+34 erg/s (one of the highest among sources of the same class), and a surface dipole magnetic field strength of 2E+14 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)% 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 SGR, we also searched for a pulsed signal in archival radio data collected with the Parkes radio telescope nine 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% duty cycle and a distance of 11 kpc) than the peak luminosity shown by the known radio magnetars.

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