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arXiv 0808.3141astro-ph
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四个重吸收HMXB的朱雀观测

Suzaku Observations of Four Heavily Absorbed HMXBs

D. C. Morris, R. K. Smith, C. B. Markwardt, R. F. Mushotzky, J. Tueller, T. R. Kallman, K. S. Dhuga

摘要:

我们报告朱雀观测四个不明来源的INTEGRAL和斯威夫特BAT银河系平面调查。所有的来源都有一个大的中性氢柱密度,很可能是一个新兴的高质量X射线双星(HMXB)的成员,这是在INTEGRAL观测中首次发现的。在我们的样本中,有两个源是近似恒定的通量源,一个源显示出周期性变化,一个源显示出短而明亮的X射线爆发。周期性是短暂的,这表明它是由一颗中子星在椭圆轨道上围绕恒星风源产生的。我们分析了耀斑源在几个部分寻找光谱变化,并讨论了源的性质的研究结果的影响。我们的结论是,在我们的样本中的所有四个源可以确定与新兴的高吸收类HMXB,一个是新发现的瞬态X射线脉冲星,至少有一个是新发现的超巨星快速X射线瞬变(SFXT)。

英文摘要:

We report on Suzaku observations of four unidentified sources from the INTEGRAL and Swift BAT Galactic plane surveys. All the sources have a large neutral hydrogen column density and are likely members of an emerging class of heavily absorbed high mass X-ray binary (HMXB) first identified in INTEGRAL observations. Two of the sources in our sample are approximately constant flux sources, one source shows periodic variation and one source exhibited a short, bright X-ray outburst. The periodicity is transient, suggesting it is produced by a neutron star in an elliptical orbit around a stellar wind source. We analyze the flaring source in several segments to look for spectral variation and discuss the implications of the findings for the nature of the source. We conclude that all four sources in our sample can be identified with the emerging class of highly absorbed HMXBs, that one is a newly identified transient X-ray pulsar and that at least one is a newly identified supergiant fast X-ray transient (SFXT).

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