A Radio Source Coincident with the Superluminous Supernova PTF10hgi: Evidence for a Central Engine and an Analog of the Repeating FRB 121102?
A Radio Source Coincident with the Superluminous Supernova PTF10hgi: Evidence for a Central Engine and an Analog of the Repeating FRB 121102?
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DOI：
10.3847/2041-8213/ab18a5
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发表时间：
2019-01
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影响因子：
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通讯作者：
T. Eftekhari;E. Berger;B. Margalit;P. Blanchard;L. Patton;P. Demorest;P. G. Williams;S. Chatterjee-S.-Cha
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作者：
T. Eftekhari;E. Berger;B. Margalit;P. Blanchard;L. Patton;P. Demorest;P. G. Williams;S. Chatterjee-S.-Cha
我们探测到了一个未解析的射电源，该射电源与爆炸后约7.5年的I型超亮超新星（SLSN）PTF 10 hgi（z = 0.098）的位置重合，通量密度为Fν（6 GHz）≈ 47.3 μJy，亮度为Lν（6 GHz）≈ 1.1 × 1028 erg s-1 Hz-1。这代表在任何时间尺度上首次检测到与SLSN同时发生的无线电发射。我们调查的无线电发射的起源：星星形成活动，一个活跃的星系核，和非相对论性超新星爆炸波的各种方案。虽然这些都是相当新颖的，如果得到证实，没有出现可能的背景下，考虑到其他属性的宿主星系，以前的射电观测SLSNe，和一般人口的氢贫超新星（SNe）。相反，无线电发射让人想起与重复FRB 121102相关的静止无线电源，该源被认为是由几十年前SLSN或长伽马射线爆发爆炸中产生的磁星提供动力。我们表明，无线电源的属性是一致的磁星风星云或离轴喷流，表明存在一个中央引擎。我们使用40分钟的甚大阵相控阵数据对PTF 10 hgi位置的快速射电爆发进行了定向搜索，结果显示没有检测到22 mJy（10σ; 10 ms持续时间）的极限。我们概述了几个后续观察，可以决定性地建立无线电发射的起源。
We present the detection of an unresolved radio source coincident with the position of the Type I superluminous supernova (SLSN) PTF10hgi (z = 0.098) about 7.5 yr post-explosion, with a flux density of Fν(6 GHz) ≈ 47.3 μJy and a luminosity of Lν(6 GHz) ≈ 1.1 × 1028 erg s−1 Hz−1. This represents the first detection of radio emission coincident with an SLSN on any timescale. We investigate various scenarios for the origin of the radio emission: star formation activity, an active galactic nucleus, and a non-relativistic supernova blastwave. While any of these would be quite novel if confirmed, none appear likely when considered within the context of the other properties of the host galaxy, previous radio observations of SLSNe, and the general population of hydrogen-poor supernovae (SNe). Instead, the radio emission is reminiscent of the quiescent radio source associated with the repeating FRB 121102, which has been argued to be powered by a magnetar born in a SLSN or long gamma-ray burst explosion several decades ago. We show that the properties of the radio source are consistent with a magnetar wind nebula or an off-axis jet, indicating the presence of a central engine. Our directed search for fast radio bursts from the location of PTF10hgi using 40 minutes of Very Large Array phased-array data reveals no detections to a limit of 22 mJy (10σ; 10 ms duration). We outline several follow-up observations that can conclusively establish the origin of the radio emission.