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arXiv 0712.2134astro-ph
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探测IGR J16493-4348的性质:1-100 keV发射的光谱和时间分析

Probing the nature of IGR J16493-4348: Spectral and temporal analysis of the 1-100 keV emission

A. B. Hill, A. J. Dean, R. Landi, V. A. McBride, A. De Rosa, A. J. Bird, A. Bazzano, V. Sguera

摘要:

IGR J16493-4348是INTEGRAL伽马射线望远镜在18-100 keV能量带探测到的第一个新来源之一。根据空间上的巧合,这个源最初与自由射电脉冲星PSR J1649-4349有关。这里介绍的是由INTEGRAL任务进行的2.8毫秒观测结果和雨燕X射线望远镜进行的5.6千秒观测结果。光谱分析表明,该源是最好的模拟吸收功率定律与高能量截止在$_{cut}$ ~15 keV和氢吸收柱NH=5.4 $^{+1.3}_{-1}$ × 10 $^{22}$ cm $^{-2}$。光变曲线的分析表明,该源是一个弱的,持久的伽马射线发射器显示在2-9和22-100千电子伏波段的变化的迹象。在1-100 keV能带内,平均源通量为~1.1 × 10^{-10} erg cm $^{-2}$ s $^{-1}$。在INTEGRAL或Swift数据中的任何时间尺度上都没有识别出相干定时信号。IGR J16493-4348的精确源位置和位置不确定性将PSR J1649-4349置于90%误差圆之外。我们得出结论,IGR J16493-4348与PSR J1649-4349无关。结合INTEGRAL观测与Swift/XRT数据以及RXTE和Chandra收集的信息,我们认为IGR J16493-4348是一颗X射线双星;尽管不能排除LMXB的性质,但其源特征有利于高质量X射线双星。

英文摘要:

IGR J16493-4348 was one of the first new sources to be detected by the INTEGRAL gamma-ray telescope in the 18-100 keV energy band. Based upon spatial coincidence the source was originally associated with the free radio pulsar PSR J1649-4349. Presented here are the results of 2.8 Ms of observations made by the INTEGRAL mission and a 5.6 ks observation with the Swift X-ray Telescope. Spectral analysis indicates that the source is best modeled by an absorbed power law with a high energy cut-off at E$_{cut}$~15 keV and a hydrogen absorbing column of NH=5.4$^{+1.3}_{-1}$ x 10$^{22}$ cm$^{-2}$. Analysis of the light curves indicates that the source is a weak, persistent gamma-ray emitter showing indications of variability in the 2-9 and 22-100 keV bands. The average source flux is ~1.1 x 10^{-10} erg cm$^{-2}$ s$^{-1}$ in the 1-100 keV energy band. No coherent timing signal is identified at any timescale in the INTEGRAL or Swift data. The refined source location and positional uncertainty of IGR J16493-4348 places PSR J1649-4349 outside of the 90% error circle. We conclude that IGR J16493-4348 is not associated with PSR J1649-4349. Combining the INTEGRAL observations with Swift/XRT data and information gathered by RXTE and Chandra we suggest that IGR J16493-4348 is an X-ray binary; and that the source characteristics favour a high mass X-ray binary although an LMXB nature cannot be ruled out.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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