A A Chrimes, P G Jonker, A J Levan, D L Coppejans, N Gaspari, B P Gompertz, P J Groot, D B Malesani, A Mummery, E R Stanway, K Wiersema
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引用次数: 0
摘要
发光快速蓝光瞬变(LFBOTs)——典型的例子是AT 2018cow——是一类罕见的事件，其起源尚不清楚。它们的特点是演化迅速，早期无特征的蓝色光谱，以及发光的x射线和射电发射。迄今为止，lfbot只在恒星形成宿主星系的小投影偏移处被发现。我们展示了哈勃太空望远镜、双子座、钱德拉和超大阵列对一个新的LFBOT, AT 2023fhn的观测。哈勃太空望远镜的数据显示，距离最近的两个星系有很大的偏移(>3.5半光半径)，两者的红移都在z ~ 0.24。AT 2023fhn的位置与之前的事件形成鲜明对比，并表明lfbot可以发生在一系列银河系环境中。
AT2023fhn (the Finch): a luminous fast blue optical transient at a large offset from its host galaxy
ABSTRACT Luminous fast blue optical transients (LFBOTs) – the prototypical example being AT 2018cow – are a rare class of events whose origins are poorly understood. They are characterized by rapid evolution, featureless blue spectra at early times, and luminous X-ray and radio emission. LFBOTs thus far have been found exclusively at small projected offsets from star-forming host galaxies. We present Hubble Space Telescope, Gemini, Chandra, and Very Large Array observations of a new LFBOT, AT 2023fhn. The Hubble Space Telescope data reveal a large offset (>3.5 half-light radii) from the two closest galaxies, both at redshift z ∼ 0.24. The location of AT 2023fhn is in stark contrast with previous events, and demonstrates that LFBOTs can occur in a range of galactic environments.
期刊介绍：
For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.
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