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arXiv 1201.0616astro-ph.HE
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Be/X射线脉冲双星RX J0440 .9+4431的宽带观测:回旋吸收线的发现

Broadband Observations of the Be/X-ray Binary Pulsar RX J0440.9+4431: Discovery of a Cyclotron Absorption Line

S. Tsygankov, R. Krivonos, A. Lutovinov

摘要:

我们报告的分析结果与INTEGRAL,雨燕和RXTE天文台在2010年4月和9月爆发的X射线脉冲星RX J0440.9+4431获得的数据。首次研究了该脉冲星在宽能量带(0.6-120 keV)的时间和光谱特性。我们在源光谱中发现了一个~32 keV的回旋共振散射特征,这使我们能够估计中子星的磁场强度为B~3.2 x 10^12 G。通过对源噪声功率谱的综合分析,证实了对磁场强度的估计。根据I型爆发之间的重现时间,双星系统的轨道周期可以估计为~155天。我们已经表明,脉冲轮廓有一个正弦波状的单峰形状,几乎没有依赖于源的光度或能带。

英文摘要:

We report the results of an analysis of data obtained with the INTEGRAL, Swift and RXTE observatories during the 2010 April and September outbursts of the X-ray pulsar RX J0440.9+4431. The temporal and spectral properties of the pulsar in a wide energy band (0.6-120 keV) were studied for the first time. We discovered a ~32 keV cyclotron resonant scattering feature in the source spectrum, that allowed us to estimate the magnetic field strength of the neutron star as B~3.2 x 10^12 G. The estimate of the magnetic field strength was confirmed by a comprehensive analysis of the noise power spectrum of the source. Based on the recurrence time between Type I outbursts the orbital period of the binary system can be estimated as ~155 days. We have shown that the pulse profile has a sinusoidal-like single-peaked shape and has practically no dependence on the source luminosity or energy band.

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