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arXiv 0711.4182astro-ph
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异常X射线脉冲星CXOU J164710 .2--455216的朱雀观测

Suzaku Observation of the Anomalous X-ray Pulsar CXOU J164710.2--455216

Sachindra Naik, Tadayasu Dotani, Nobuyuki Kawai, Motohide Kokubun, Takayasu Anada, Mikio Morii, Tatehiro Mihara, Teruaki Enoto, Madoka Kawaharada, Toshio Muraka… 展开作者

Sachindra Naik, Tadayasu Dotani, Nobuyuki Kawai, Motohide Kokubun, Takayasu Anada, Mikio Morii, Tatehiro Mihara, Teruaki Enoto, Madoka Kawaharada, Toshio Murakami, Yujin E. Nakagawa, Hiromitsu Takahashi, Yukikatsu Terada, Atsumasa Yoshida

摘要:

2006年9月23日至24日,朱雀公司对异常X射线脉冲星CXYJ 164710.2 -455216进行了观测,观测净曝光量为38.8 ks。在观察期间,XIS在1/8窗口选项中操作,以实现1 s的时间分辨率。在XIS光变曲线中清晰地检测到脉动,其重心校正脉冲周期为10.61063(2)s。在0.2- 6.0keV能量范围内,XIS脉冲波形显示出3个不同幅度的峰,RMS分数幅度约为11%。虽然该源是用朱雀的HXD观测的,但其观测数据受到HXD视场内邻近的亮X射线源GX 340+0的高度污染。1-10 keV的XIS光谱很好地拟合两个黑体分量。两个黑体成分的温度分别为0.61+/-0.01 keV和1.22+/-0.06 keV,吸收柱密度值为1.73+/-0.03 x 10^{22} atoms cm^{-2}。在1-10 keV能量范围内观测到的源通量计算为2.6 x 10^{-11} ergs cm^{-2} s^{-1},软黑体分量的贡献很大(kT = 0.61 keV)。XIS数据的脉冲相位分辨光谱表明,软黑体分量的通量由三个窄峰组成,而另一个分量的通量在AXP的脉冲周期上显示出单峰。黑体半径在2.2-2.7公里和0.28-0.38公里(假设源距离为5千秒差距)之间的变化,分别为软和硬组件的脉冲相位。从定时和频谱分析获得的结果的细节。

英文摘要:

Suzaku TOO observation of the anomalous X-ray pulsar CXOU J164710.2-455216 was performed on 2006 September 23--24 for a net exposure of 38.8 ks. During the observation, the XIS was operated in 1/8 window option to achieve a time resolution of 1 s. Pulsations are clearly detected in the XIS light curves with a barycenter corrected pulse period of 10.61063(2) s. The XIS pulse profile shows 3 peaks of different amplitudes with RMS fractional amplitude of ~11% in 0.2--6.0 keV energy band. Though the source was observed with the HXD of Suzaku, the data is highly contaminated by the nearby bright X-ray source GX 340+0 which was in the HXD field of view. The 1-10 keV XIS spectra are well fitted by two blackbody components. The temperatures of two blackbody components are found to be 0.61+/-0.01 keV and 1.22+/-0.06 keV and the value of the absorption column density is 1.73+/-0.03 x 10^{22} atoms cm^{-2}. The observed source flux in 1-10 keV energy range is calculated to be 2.6 x 10^{-11} ergs cm^{-2} s^{-1} with significant contribution from the soft blackbody component (kT = 0.61 keV). Pulse phase resolved spectroscopy of XIS data shows that the flux of the soft blackbody component consists of three narrow peaks, whereas the flux of the other component shows a single peak over the pulse period of the AXP. The blackbody radii changes between 2.2-2.7 km and 0.28-0.38 km (assuming the source distance to be 5 kpc) over pulse phases for the soft and hard components, respectively. The details of the results obtained from the timing and spectral analysis is presented.

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