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arXiv 1005.0684astro-ph.HE
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用Swift-BAT探测超巨星高质量X射线双星IGR J16465 $-$ 4507的轨道周期

Detection of an orbital period in the supergiant high mass X-ray binary IGR J16465$-$4507 with Swift-BAT

V. La Parola, G. Cusumano, P. Romano, A. Segreto, S. Vercellone, G. Chincarini

摘要:

我们分析了IGR J16465-4507 Burst Alert Teelescope在Swift任务的前54个月收集的调查数据。该源位于拥挤的区域中,并且通过在~14个标准差的显著性水平下的特别成像分析来揭示。15-50 keV的平均通量约为3E-11 erg/cm^2/s。时间分析显示轨道周期为30.243 +/- 0.035天。折叠的光变曲线显示了最小强度的宽相位间隔的存在,持续约20%的轨道周期。这可以解释为在一个非常偏心的轨道上的致密物体的全蚀,或与致密源通过低密度风在轨道apastron的通道。在BAT监测期间观察到的适度动力学范围表明IGR J16465-4507是一个风馈系统,从相当均匀的风中不断吸积,而不是超巨星快速X射线瞬变类的成员。

英文摘要:

We analysed the IGR J16465-4507 Burst Alert Teelescope survey data collected during the first 54 months of the Swift mission. The source is in a crowded field and it is revealed through an ad hoc imaging analysis at a significance level of ~14 standard deviations. The 15-50 keV average flux is ~3E-11 erg/cm^2/s. The timing analysis reveals an orbital period of 30.243 +/- 0.035 days. The folded light curve shows the presence of a wide phase interval of minimum intensity, lasting ~20% of the orbital period. This could be explained with a full eclipse of the compact object in an extremely eccentric orbit or with the passage of the compact source through a lower density wind at the orbit apastron. The modest dynamical range observed during the BAT monitoring suggests that IGR J16465-4507 is a wind-fed system, continuously accreting from a rather homogeneous wind, and not a member of the Supergiant Fast X-ray Transient class.

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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