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The Suzaku Discovery of A Hard Power-Law Component in the Spectra of Short Bursts from SGR 0501+4516

Nakagawa, Yujin E ; Makishima, Kazuo ; Enoto, Teruaki

Publications of the Astronomical Society of Japan, 2011-11, Vol.63 (sp3), p.S813-S820 [Periódico revisado por pares]

Oxford, UK: Oxford Universtiy Press

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  • Título:
    The Suzaku Discovery of A Hard Power-Law Component in the Spectra of Short Bursts from SGR 0501+4516
  • Autor: Nakagawa, Yujin E ; Makishima, Kazuo ; Enoto, Teruaki
  • É parte de: Publications of the Astronomical Society of Japan, 2011-11, Vol.63 (sp3), p.S813-S820
  • Descrição: Using data with the Suzaku XIS and HXD, spectral studies of short bursts from the soft gamma repeater SGR 0501 $+$ 4516 were performed. In total, 32 bursts were detected during the $\sim\ $ 60 ks of observation conducted in the 2008 August activity. Excluding the strongest one, the remaining 31 bursts showed an average 2–40 keV fluence of $\left(1.0_{-0.5}^{+0.3}\right)$ $\times$ 10 $^{-9}\ $ erg cm $^{-2}$ . A 1–40 keV spectrum summed over them leaves significant positive residuals in the HXD-PIN band with $\chi^{2}/$ d.o.f. $=$ 74 $/$ 50, when fitted with a two-blackbody function. By adding a power-law model, the fit became acceptable with $\chi^2/$ d.o.f. $=$ 56 $/$ 48, yielding a photon index of $\Gamma$ $=$ 1.0 $_{-0.3}^{+0.4}$ . This photon index is comparable to $\Gamma$ $=$ 1.33 $_{-0.16}^{+0.23}$ (Enoto et al. 2010, ApJ, 715, 665) for the persistent emission of the same object obtained with Suzaku. The two-blackbody components showed very similar ratios, both in the temperature and the emission radii, to those comprising the persistent emission. However, the power-law to two-blackbody flux ratio was possibly higher than that of the persistent emission at the 2.6 $\ \sigma$ level. Based on these measurements, average wide-band properties of these relatively weak bursts are compared with those of the persistent emission.
  • Editor: Oxford, UK: Oxford Universtiy Press
  • Idioma: Inglês
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