arXiv 0704.32242007-04astro-ph

超巨星快速X射线瞬变：一种普遍的行为还是一类天体？

Supergiant Fast X-ray Transients: A common behaviour or a class of objects?

Ignacio Negueruela, David M. Smith, Jose Miguel Torrejon, Pablo Reig

备注：: To appear in ''Proceedings of the 6th Integral Workshop "The obscured Universe", Moscow, July 3-7 2006'' (replaced with refereed version 10 May 07). Best viewed in PDF format
发表信息：: ESA SP-622, 255 (2008)

摘要：

对银道面的综合监测显示，周期性的X射线瞬变现象越来越多，其特征是具有非常快的上升时间（约数十分钟）和典型的几个小时的持续时间的短爆发。这些射线源中有相当一部分与OB超巨星有关，因此定义了一类新的大质量X射线双星，我们称之为超巨星快速X射线瞬变。目前正在确定其对应物的天体物理参数。到目前为止，我们已经在很大的距离范围内发现了一些不同光度的晚O和早B超巨星。它们的光学性质没有什么能将它们与经典的超巨星X射线双星区分开来。另一方面，现在有相当确凿的证据表明，持久的超巨星X射线双星也显示出快速爆发。这表明在典型的持久性超巨星系统和纯粹的瞬态系统之间存在连续的行为，但关于爆发的物理原因提供的信息很少。

英文摘要：

INTEGRAL monitoring of the Galactic Plane is revealing a growing number of recurrent X-ray transients, characterised by short outbursts with very fast rise times (~ tens of minutes) and typical durations of a few hours. A substantial fraction of these sources are associated with OB supergiants and hence define a new class of massive X-ray binaries, which we call Supergiant Fast X-ray Transients. Characterisation of the astrophysical parameters of their counterparts is underway. So far, we have found a number of late O and early B supergiants of different luminosities at a large range of distances. Nothing in their optical properties sets them apart from classical Supergiant X-ray Binaries. On the other hand, there is now rather concluding evidence that persistent supergiant X-ray binaries also show fast outbursts. This suggests a continuum of behaviours between typical persistent supergiant systems and purely transient systems, but offers very little information about the physical causes of the outbursts.

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