Esposito 2007 SGR 1806-20 two years observations

主要内容:
Return to the pre-era of the giant flare, and is still active.

精彩摘抄:


文章信息:
SGR 1806-20 about two years after the giant flare: Suzaku, XMM-Newton and INTEGRAL observations

Authors: P. Esposito, S. Mereghetti, A. Tiengo, S. Zane, R. Turolla, D. Gotz, N. Rea, N. Kawai, M. Ueno, G.L. Israel, L. Stella, M. Feroci

(Submitted on 15 Oct 2007)

Abstract: In December 2004, the soft gamma-ray repeater SGR 1806-20 emitted the most powerful giant flare ever observed. This probably involved a large-scale rearrangement of the magnetosphere leading to observable variations in the properties of its X-ray emission. Here we present the results of the first Suzaku observation of SGR 1806-20, together with almost simultaneous observations with XMM-Newton and INTEGRAL. The source seems to have reached a state characterized by a flux close to the pre-flare level and by a relatively soft spectrum. Despite this, SGR 1806-20 remained quite active also after the giant flare, allowing us to study several short bursts observed by Suzaku in the 1-100 keV range. We discuss the broad-band spectral properties of SGR 1806-20, covering both persistent and bursting emission, in the context of the magnetar model, and consider its recent theoretical developments.

Comments:	Accepted for publication in Astronomy & Astrophysics
Subjects:	Astrophysics (astro-ph)
Cite as:	arXiv:0710.2789v1 [astro-ph]