阿塔卡马宇宙学望远镜:单次观测图像的系统性暂现源搜寻
The Atacama Cosmology Telescope: Systematic Transient Search of Single Observation Maps
AI总结:
本文利用ACT 2017至2022年多频段数据构建单次观测图像暂现源探测流程,发现34个暂现事件,并报告未探测到伽马暴反向激波辐射。
摘要:
我们利用阿塔卡马宇宙学望远镜(ACT)的数据对天体物理暂现源进行了系统性搜寻。这些数据于2017年至2022年间在覆盖77 GHz至277 GHz的三个频段获取。本文提出了一套基于单次观测图像的暂现源探测流程,其中图像的每个像素包含一次积分时间约为四分钟的观测。我们在27个独特位置探测到34个暂现事件。除两个暂现源外,其余均与银河系恒星相关联,并表现出广泛的特性。我们还探测到一个与经典新星玉夫座R(YZ Ret)重合的事件,以及一个与耀变活动星系核相一致的事件。值得注意的是,我们未探测到来自伽马射线暴的任何反向激波辐射,这一未探测结果可能与当前模型存在张力。
英文摘要:
We conduct a systematic search for astrophysical transients using data from the Atacama Cosmology Telescope (ACT). The data were taken from 2017 to 2022 in three frequency bands spanning 77 GHz to 277 GHz. In this paper we present a pipeline for transient detection using single observation maps where each pixel of a map contains one observation with an integration time of approximately four minutes. We detect 34 transient events at 27 unique locations. All but two of the transients are associated with Galactic stars and exhibit a wide range of properties. We also detect an event coincident with the classical nova YZ Ret and one event consistent with a flaring active galactic nucleus. We notably do not detect any reverse shock emission from gamma ray bursts, a non-detection that may be in tension with current models.
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