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ASKAP J005512.2-255834：一个在z=0.1处的高亮度、长寿命的射电暂现源——一个孤儿后光或一个远离星核的IMBH潮汐破坏事件？

ASKAP J005512.2-255834: A Luminous, Long-Lived Radio Transient at z = 0.1 -- an Orphan Afterglow or an off-nuclear TDE from an IMBH?

Sydney Institute for Astronomy, School of Physics, The University of Sydney（悉尼大学物理学院天体物理学研究所）；ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)（引力波发现卓越研究中心）；Australia Telescope National Facility, CSIRO, Space and Astronomy（CSIRO空间与天文国家望远镜设施）；Department of Physics, University of Wisconsin-Milwaukee（威斯康星大学密尔沃基分校物理系）
Ashna Gulati, Tara Murphy, David L. Kaplan, Dougal Dobie, Charlotte Ward, Gemma Anderson, Manisha Caleb, Poonam Chandra, Jeff Cooke, Barnali Das, Adam Deller, A… 展开作者

Ashna Gulati, Tara Murphy, David L. Kaplan, Dougal Dobie, Charlotte Ward, Gemma Anderson, Manisha Caleb, Poonam Chandra, Jeff Cooke, Barnali Das, Adam Deller, Adelle Goodwin, Kelly Gourdji, Giancarlo Ghirlanda, Emil Lenc, Anais Möller, James K. Leung, Stella Koch Ocker, Joshua Pritchard, Claudio Ricci, Elaine M. Sadler, Om Sharan Salafia, Kavya Shaji, Roberto Soria, Mark Suhr, Artem Tuntsov, Ziteng Wang

备注：
This paper has been accepeted for publication in ApJ
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AI总结：

研究发现一个高亮度射电暂现源，可能为孤立长持续时间伽马射线暴后光或中间质量黑洞潮汐破坏事件，其射电亮度极高且罕见。

摘要：

我们报告了发现一个缓慢变化的、 extragalactic射电暂现源ASKAP J005512.2--255834（以下简称ASKAP J0055-2558），该源是通过澳大利亚SKA Pathfinder在寻找与存档引力波事件相关的孤儿后光的搜索中发现的。尽管是在这种背景下发现的，但没有证据表明该暂现源与任何已知的引力波事件有关。然而，该源在不到250天的时间内，其通量密度增加了20倍，并且在初始发现后超过1000天后，它仍处于衰减、可检测的状态。从0.3到9 GHz的后续观测揭示出一个随时间变化的光谱，与同步辐射一致。ASKAP J0055-2558与一个低质量、恒星形成星系在红移z=0.116（d_L=543 Mpc）处重合，将其峰值射电亮度置于νL_ν≈10^{39} erg s^{-1}。对其射电光变曲线、推断的爆波速度、能量、宿主星系性质以及在其他波长上没有对应物的分析表明，ASKAP J0055-2558最符合一个孤儿长持续时间伽马射线暴后光的晚期阶段或一个涉及中间质量黑洞的潮汐破坏事件，该黑洞位于星系核偏移的位置。这两种现象的射电发现极为罕见，目前只有少数或没有确认的例子。

英文摘要：

We report the discovery of a slowly evolving, extragalactic radio transient, ASKAP J005512.2--255834 (hereafter ASKAP J0055-2558), identified using the Australian SKA Pathfinder in a search for orphan afterglows associated with archival gravitational wave events. Although discovered in this context, there is no evidence that the transient is associated with any known gravitational wave event. Nonetheless, this source exhibits a 20-fold increase in flux density over $<250$ days, and it remains in a declining, detectable state more than 1000 days after the initial detection. Follow-up observations from 0.3 to 9 GHz reveal an evolving spectrum consistent with synchrotron emission. ASKAP J0055-2558 is spatially coincident with a low-mass, star-forming galaxy at redshift $z = 0.116$ ($d_{\rm L}$= 543 Mpc), placing its peak radio luminosity at $νL_ν\sim 10^{39}\,\rm erg\,s^{-1}$. Analysis of its radio light curve, inferred blastwave velocity, energetics, host galaxy properties and the absence of counterparts at other wavelengths suggest that ASKAP J0055-2558 is most consistent with either the late-time phase of an orphan long gamma-ray burst afterglow or a tidal disruption event involving an intermediate-mass black hole spatially offset from the galaxy nucleus. The radio discovery of either of these phenomena is extremely rare, with only a few or no confirmed examples to date.

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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