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arXiv 2003.05953astro-ph.HE
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激变变星中喷流的情况

The case for jets in cataclysmic variables

Deanne Coppejans, Christian Knigge

摘要:

几十年来,激变变星(CV)被认为是为数不多的不发射喷气机的吸积致密天体之一,因此被用来约束喷气机发射模型。然而,最近的理论和观测进展表明,CV实际上确实会发射喷气式飞机。具体来说,它证明了它们的吸积-流出循环类似于它们的更高质量表亲-X射线双星(XRB)。随后对天鹅座CV SS的观测证实了这一点,并一直显示出与XRB中标志着瞬变喷流的射电耀斑相当。根据这一发现和发射特性,一些研究得出结论,无线电发射最有可能来自瞬态喷流。其他CV的观察结果虽然不是结论性的,但与这一解释一致。然而,这个问题尚未解决。后来的观测对这个模型提出了一些问题,以及潜在的替代无线电发射机制。CV是非相对论性的,并且许多CV具有确定的距离;这些性质将使它们成为解决我们关于基本射流物理学的许多悬而未决的问题的理想候选者。在这里,我们回顾了简历中的喷气式飞机的情况,讨论了悬而未决的问题和问题,并概述了未来的工作,以最终回答简历是否发射喷气式飞机的问题。

英文摘要:

For decades cataclysmic variables (CVs) were thought to be one of the few classes of accreting compact objects to not launch jets, and have consequently been used to constrain jet launching models. However, recent theoretical and observational advances indicate that CVs do in fact launch jets. Specifically, it was demonstrated that their accretion-outflow cycle is analogous to that of their higher mass cousins -- the X-ray Binaries (XRBs). Subsequent observations of the CV SS Cygni confirmed this and have consistently shown radio flaring equivalent to that in the XRBs that marks a transient jet. Based on this finding and the emission properties, several studies have concluded that the radio emission is most likely from a transient jet. Observations of other CVs, while not conclusive, are consistent with this interpretation. However, the issue is not yet settled. Later observations have raised a number of questions about this model, as well as about potential alternative radio emission mechanisms. CVs are non-relativistic and many have well-determined distances; these properties would make them ideal candidates with which to address many of our outstanding questions about fundamental jet physics. Here we review the case for jets in CVs, discuss the outstanding questions and issues, and outline the future work necessary to conclusively answer the question of whether CVs launch jets.

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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