Spin-down rate and inferred dipole magnetic field of the soft gamma-ray repeater SGR 1627-41

Дата и время публикации : 2009-07-16T15:51:58Z

Авторы публикации и институты :
P. Esposito
M. Burgay
A. Possenti
R. Turolla
S. Zane
A. De Luca
A. Tiengo
G. L. Israel
F. Mattana
S. Mereghetti
M. Bailes
P. Romano
D. Götz
N. Rea

Ссылка на журнал-издание: Monthly Notices of the Royal Astronomical Society: Letters, Volume 399, Issue 1, pp. L44-L48 (2009)
Коментарии к cтатье: 5 pages, 2 figures; accepted for publication in MNRAS Letters
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE

Краткий обзор статьи: 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.

Category: Physics