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arXiv 1401.4535astro-ph.HE
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2012年巨大爆发期间,在GRO J1008-57的X射线光谱中牢固检测到朱雀的回旋共振特征

Firm Detection of a Cyclotron Resonance Feature with Suzaku in the X-ray Spectrum of GRO J1008-57 during a Giant Outburst in 2012

Takayuki Yamamoto, Tatehiro Mihara, Mutsumi Sugizaki, Motoki Nakajima, Kazuo Makishima, Makoto Sasano

摘要:

我们报告了在2012年11月MAXI气体狭缝相机探测到的一次巨大爆发期间,朱雀硬X射线探测器在Be X射线双星脉冲星GRO J1008-57的X射线光谱中探测到的回旋共振散射特征(CRSF)。朱雀观测是在2012年11月20日进行的,当X射线通量在4-10 keV到达$\sim 0.45$螃蟹时爆发最大,这相当于在5.8 kpc的0.5- 100 keV的$1.1 \times 10^{38}$ erg s $^{-1}$的光度。从0.5 keV到118 keV的宽带X射线谱显示了在$\sim 76$ keV处的显著吸收特征,被认为是基本的CRSF。这明确地再次确认了先前在GRO J1008 $-$ 57中建议的$\sim$ 80 keV光谱特征。隐含的表面磁场,$6.6\times 10^{12}$ G,是最高的二元X射线天体中的CRSF已被检测到。

英文摘要:

We report on the firm detection of a cyclotron resonance scattering feature (CRSF) in the X-ray spectrum of the Be X-ray binary pulsar, GRO J1008-57, achieved by the Suzaku Hard X-ray Detector during a giant outburst which was detected by the MAXI Gas Slit Camera in 2012 November. The Suzaku observation was carried out on 2012 November 20, outburst maximum when the X-ray flux reached $\sim 0.45$ Crab in 4-10 keV, which corresponds to a luminosity of $1.1 \times 10^{38}$ erg s$^{-1}$ in 0.5--100 keV at 5.8 kpc. The obtained broadband X-ray spectrum from 0.5 keV to 118 keV revealed a significant absorption feature, considered as the fundamental CRSF, at $\sim 76$ keV. This unambiguously reconfirm the previously suggested $\sim$ 80 keV spectral feature in GRO J1008$-$57. The implied surface magnetic field, $6.6\times 10^{12}$ G, is the highest among binary X-ray pulsars from which CRSFs have ever been detected.

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