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首页> 外文期刊>The Astrophysical journal >The Koala: A Fast Blue Optical Transient with Luminous Radio Emission from a Starburst Dwarf Galaxy at z?=?0.27
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The Koala: A Fast Blue Optical Transient with Luminous Radio Emission from a Starburst Dwarf Galaxy at z?=?0.27

机译：Koala：一种快速的蓝色光学瞬态，具有来自Z的星暴矮星系的发光无线电发射？=？0.27

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摘要

We present ZTF18abvkwla (the "Koala"), a fast blue optical transient discovered in the Zwicky Transient Facility (ZTF) One-Day Cadence (1DC) Survey. ZTF18abvkwla has a number of features in common with the groundbreaking transient AT 2018cow: blue colors at peak ( mag), a short rise time from half-max of under two days, a decay time to half-max of only three days, a high optical luminosity ( mag), a hot (?40,000 K) featureless spectrum at peak light, and a luminous radio counterpart. At late times ( ), the radio luminosity of ZTF18abvkwla ( at 10 , observer-frame) is most similar to that of long-duration gamma-ray bursts (GRBs). The host galaxy is a dwarf starburst galaxy ( , ) that is moderately metal-enriched ( ), similar to the hosts of GRBs and superluminous supernovae. As in AT2018cow, the radio and optical emission in ZTF18abvkwla likely arise from two separate components: the radio from fast-moving ejecta ( ) and the optical from shock-interaction with confined dense material (<0.07 M _(⊙) in ). Compiling transients in the literature with and mag, we find that a significant number are engine-powered, and suggest that the high peak optical luminosity is directly related to the presence of this engine. From 18 months of the 1DC survey, we find that transients in this rise-luminosity phase space are at least two to three orders of magnitude less common than CC SNe. Finally, we discuss strategies for identifying such events with future facilities like the Large Synoptic Survey Telescope, as well as prospects for detecting accompanying X-ray and radio emission.
机译：我们呈现ZTF18abvkwla（“Koala”），在Zwicky瞬态设施（ZTF）单日Cadence（1DC）调查中发现了一种快速的蓝色光学瞬态。 ZTF18abvkwla有许多功能与2018Cow的开创性瞬态有很多功能：峰值（MAG）的蓝色，从两天内的半最大的短暂上升时间，衰减时间只有三天的半最大，高光学亮度（MAG），峰值光的热（α40,000k）无特色光谱，以及发光无线电对应物。在延迟时间（）时，ZTF18abvkwla的无线电光度（10，观察者帧）最类似于长持续时间伽马射线突发（GRB）。主持人Galaxy是一个矮星的星系（，），其适度富含金属富含金属的（），类似于GRBS和超燃烧的超新星寄生。如在2018，ZTF18ABVKWLA中的无线电和光发射可能从两个单独的组件出现：从快速移动的喷射器（）和光学来自冲击相互作用的无线电（<0.07 m _（⊙） ）。在文献中编译瞬态和MAG，我们发现有很大的数字是发动机供电，并表明高峰光学亮度与该发动机的存在直接相关。从1DC调查的18个月开始，我们发现该升起亮度相位空间中的瞬变比CC SNE不那么常见的至少两到三个数量级。最后，我们讨论了与大型舞台调查望远镜等未来设施识别此类事件的策略，以及用于检测伴随X射线和无线电发射的前景。

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