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星期五, 一月 23, 2009

Enoto 2009 SGR 0501+4516的一个爆发的观测

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Title:
Suzaku Observation of the New Soft Gamma Repeater SGR 0501+4516 in Outburst
Authors:
Enoto, T.; Nakagawa, Y. E.; Rea, N.; Esposito, P.; Gotz, D.; Hurley, K.; Israel, G. L.; Kokubun, M.; Makishima, K.; Mereghetti, S.; Murakami, H.; Nakazawa, K.; Sakamoto, T.; Stella, L.; Tiengo, A.; Turolla, R.; Yamada, S.; Yamaoka, K.; Yoshida, A.; Zane, S.
Publication:
eprint arXiv:0901.3453
Publication Date:
01/2009
Origin:
ARXIV
Keywords:
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Comment:
4 pages, 4 figures, accepted for publication in ApJL
Bibliographic Code:
2009arXiv0901.3453E

Abstract

We present the first Suzaku observation of the new Soft Gamma Repeater SGR 0501+4516, performed on 2008 August 26, four days after the onset of bursting activity of this new member of the magnetar family. The soft X-ray persistent emission was detected with the X-ray Imaging Spectrometer (XIS) at a 0.5-10 keV flux of 3.8E-11 erg/s/cm2, with a spectrum well fitted by an absorbed blackbody plus power-law model. The source pulsation was confirmed at a period of 5.762072+/-0.000002 s, and 32 X-ray bursts were detected by the XIS, four of which were also detected at higher energies by the Hard X-ray Detector (HXD). The strongest burst, which occurred at 03:16:16.9 (UTC), was so bright that it caused instrumental saturation, but its precursor phase, lasting for about 200 ms, was detected successfully over the 0.5-200 keV range, with a fluence of ~2.1E-7 erg/cm2 and a peak intensity of about 89 Crab. The entire burst fluence is estimated to be ~50 times higher. The precursor spectrum was very hard, and well modeled by a combination of two blackbodies. We discuss the bursting activity and X/gamma-ray properties of this newly discovered Soft Gamma Repeater in comparison with other members of the class.
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