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THE NATURE OF THE DEEP LENS SURVEY FAST TRANSIENTS

机译：深镜头调查快速瞬变的本质

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摘要

The discovery and study of highly transient sources, especially those that rise to high brightness and then fade to obscurity, has been a major part of modern astrophysics. Well-known examples include supernovae and novae. A by-product of the Deep Lens Survey was the discovery of three transients that varied on a timescale of less than an hour. All three had faint and red counterparts, the brightest of which was identified with an M star. However, the remaining two showed hints of an extragalactic origin; one had a spatially extended counterpart, and the other appeared in projection on the outskirts of a bright elliptical galaxy. If these two sources were really of extragalactic origin, then the two events represent a new class of exotic explosive transients. We undertook spectroscopic observations with the Keck telescope and find that the two counterparts are also late-type Galactic dwarfs. Our main conclusion is that flares from M dwarfs constitute a dense foreground fog and dominate over any plausible class of extragalactic fast transients by at least 2 orders of magnitude. Overcoming this fog will likely require dedicated surveys with careful optimization of target field location, filter(s), and cadence, presearch imaging to filter out late-type dwarfs, and a well-planned rapid follow-up plan.
机译：对高瞬变源的发现和研究，尤其是那些上升到高亮度然后逐渐消失的模糊源，已成为现代天体物理学的重要组成部分。著名的例子包括超新星和新星。深度镜头调查的副产品是发现三个瞬态，它们在不到一个小时的时间范围内变化。所有这三个都有淡淡的红色对应物，其中最亮的是M星。但是，其余两个显示出银河系外的暗示。一个在空间上扩展，而另一个在投影上出现在明亮的椭圆形星系的郊区。如果这两个来源确实是银河系外的，那么这两个事件就代表了一类新的奇异爆炸瞬变。我们用凯克望远镜进行了光谱观察，发现这两个对应物也是晚期银河系矮星。我们的主要结论是，来自M矮星的耀斑构成了浓密的前景雾，并且在任何可能的银河系外快速瞬变中占据了至少2个数量级。要克服这种迷雾，可能需要进行专门的调查，并仔细优化目标场的位置，过滤器和节奏，进行预搜索成像以过滤出晚期矮人，并制定周密的快速后续计划。

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  • 来源
    《The Astrophysical journal》 |2006年第1pt2期|p.L63-L66|共4页
  • 作者

    S. R. KULKARNI; A. RAU;

  • 作者单位

    Caltech Optical Observatories, Mail Code 105-24, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125;

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  • 正文语种 eng
  • 中图分类 天文学;
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