Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-11-28
Astrophys.J.Lett.690:L105-L109,2009
Astronomy and Astrophysics
Astrophysics
Minor changes to match the final version (to appear in The Astrophysical Journal Letters). 5 pages in emulate-apj style, 1 tab
Scientific paper
10.1088/0004-637X/690/2/L105
After nearly a decade of quiescence, the soft gamma-ray repeater SGR 1627-41 reactivated on 2008 May 28 with a bursting episode followed by a slowly decaying enhancement of its persistent emission. To search for the still unknown spin period of this SGR taking advantage of its high flux state, we performed on 2008 September 27-28 a 120 ks long X-ray observation with the XMM-Newton satellite. Pulsations with P = 2.594578(6) s were detected at a higher than 6-sigma confidence level, with a double-peaked pulse profile. The pulsed fraction in the 2-12 keV range is 19% +/- 3% and 24% +/- 3% for the fundamental and the second harmonic, respectively. The observed 2-10 keV flux is 3.4E-13 erg/cm^2/s, still a factor of ~ 5 above the quiescent pre-burst-activation level, and the spectrum is well fitted by an absorbed power law plus blackbody model (photon index Gamma = 0.6, blackbody temperature kT = 0.5 keV, and absorption nH = 1.2E+23 cm^-2). We also detected a shell of diffuse soft X-ray emission which is likely associated with the young supernova remnant G337.0-0.1.
de Luca Andrea
Esposito Paolo
Gotz Diego
Israel Gian Luca
Mereghetti Sandro
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