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arXiv 0801.3247astro-ph
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HMXB源AXJ1749 X射线脉动的发现。1 -2733

Discovery of X-ray Pulsations from the HMXB Source AXJ1749.1-2733

D. I. Karasev, S. S. Tsygankov, A. A. Lutovinov

摘要:

我们正在报告的X射线脉动源AX J1749.1-2733的周期为~132秒的基础上获得的XMM-牛顿数据在2007年3月的发现。所观察到的脉冲轮廓具有双峰结构,在3-10 keV的能量带中,脉冲分数约为25- 30%。我们还发现,在2009年9月11日的一次爆发中,INTEGRAL天文台上的IBIS望远镜从源处检测到了一个几乎相同周期的周期性。9,2003年在20-50 keV的能量带。由于双峰脉冲轮廓,在两个周期图上都有一个大约66 s的额外峰值,因此我们还研究了最后一个值是真实脉冲周期的可能性。XMM-牛顿天文台在软能带获得的源谱由于双星系统中的强内禀吸收而被严重吸收($N_H\simeq2\times10^{23}$ cm $^{-2}$),这导致AX J1749.1-2733是高质量X射线双星系统中的一个新的瞬态X射线脉冲星的结论。

英文摘要:

We are reporting a discovery of X-ray pulsations from the source AX J1749.1-2733 with the period of ~132 s based on the XMM-Newton data obtained in March 2007. The observed pulse profile has a double-peaked structure with the pulse fraction of about 25-30 % in the 3-10 keV energy band. We have also found that a periodicity with practically the same period has been detected from the source by the IBIS telescope onboard the INTEGRAL observatory during an outburst on Sept. 9, 2003 in the 20-50 keV energy band. Due to the double-peaked pulse profile, there is an additional peak on both periodograms of nearly ~66 s, therefore we have also investigated the possibility that the last value is the true pulse period. The source spectrum obtained by the XMM-Newton observatory in the soft energy band is being heavily absorbed ($N_H\simeq2\times10^{23}$ cm$^{-2}$) due to a strong intrinsic absorption in the binary system that leads to the conclusion that AX J1749.1-2733 is a new transient X-ray pulsar in the high mass X-ray binary system.

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