Firm detection of a cyclotron resonance feature with Suzaku in the X-ray spectrum of GRO J1008−57 during a giant outburst in 2012
Firm detection of a cyclotron resonance feature with Suzaku in the X-ray spectrum of GRO J1008−57 during a giant outburst in 2012
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DOI：
10.1093/pasj/psu028
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发表时间：
2014-01
影响因子：
2.3
通讯作者：
Takayuki Yamamoto;T. Mihara;M. Sugizaki;M. Nakajima;K. Makishima;M. Sasano
中科院分区：
文献类型：
--
作者：
Takayuki Yamamoto;T. Mihara;M. Sugizaki;M. Nakajima;K. Makishima;M. Sasano
我们报告的回旋共振散射功能（CRSF）的Be X射线双星脉冲星，GRO J1008-57的X射线光谱，实现了由朱雀硬X射线探测器在一个巨大的爆发，这是由MAXI气体狭缝相机在2012年11月检测到的。朱雀观测是在2012年11月20日进行的，爆发最大时，X射线通量达到4-10 keV的$\sim 0.45$ Crab，这相当于在5.8 kpc的0.5- 100 keV的光度为1.1\times 10^{38}$ erg s$^{-1}$。从0.5千电子伏到118千电子伏的宽带X射线光谱揭示了一个显着的吸收功能，被认为是基本的CRSF，在$\sim 76$千电子伏。这明确地再次确认了先前建议的GRO J1008$-$57中的$\sim $80 keV光谱特征。隐含的表面磁场为6.6 × 10^{12}$ G，是迄今为止探测到CRSF的X射线双星中最高的。
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.