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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Sudden end of X-ray outbursts around periastron of Circinus X-1 observed with MAXI
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Sudden end of X-ray outbursts around periastron of Circinus X-1 observed with MAXI

机译：用MAXI观察到在Circinus X-1周围周质周围X射线突然爆发

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摘要

MAXI/GSC (Monitor of All-sky X-ray Image/Gas Slit Camera) observed 21 outbursts from Circinus X-1 between 2009 August and 2013 December. Although 14 outbursts showed ordinary gradual decays, in seven others we found a sudden drop in luminosity on a time scale of a few hours around the periastron, and then the outbursts terminated. These sudden drops started at the estimated luminosity of a few times 10~(37) erg s~(-1) and their luminosities dropped to ≤3 × 10~(36) erg s~(-1). We offer three interpretations of the sudden drop: (1) the end of the outburst during its dip, (2) the propeller effect, and (3) the stripping effect by the stellar wind of the companion star. It is difficult to explain the phenomenon by any of these interpretations alone. The interpretation of (1) is possible for only two outbursts on the assumption of rapid decay. The propeller effect (2) is expected to occur at a constant luminosity, which is incompatible with the observed facts. In the stripping effect (3), the ram pressure of a typical stellar wind is not sufficient to blowmost of the accretion disk off. In this paper, we discuss the possibility of a modified stripping effect by assuming other additional conditions such as wind clumping and disk instability.
机译：在2009年8月至2013年12月之间，MAXI / GSC（全天候X射线图像/气体狭缝相机监控器）观测到21次Circinus X-1爆发。尽管有14次爆发显示出通常的逐渐衰减，但在另外7次爆发中，我们发现在星云周围几小时的时间内，亮度突然下降，然后爆发终止。这些突然下降始于估计的10〜（37）erg s〜（-1）的几度光度，它们的光度下降到≤3×10〜（36）erg s〜（-1）。我们对突然下降提供了三种解释：（1）爆发期间的爆发结束;（2）螺旋桨效应;（3）伴星恒星风带来的剥离效应。仅凭这些解释中的任何一种都很难解释这种现象。在假定快速衰减的前提下，仅两次爆发可能解释（1）。预计螺旋桨效应（2）会以恒定的亮度发生，这与观察到的事实不相容。在剥离效果（3）中，典型的恒星风的冲压压力不足以吹走大部分吸积盘。在本文中，我们通过假设其他附加条件（例如风团和磁盘不稳定性）来讨论修改剥离效果的可能性。

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