The Atacama Cosmology Telescope: Systematic Transient Search of Single Observation Maps

arXiv - PHYS - Solar and Stellar Astrophysics Pub Date : 2024-09-12 DOI:arxiv-2409.08429

Emily K. Biermann, Yaqiong Li, Sigurd Naess, Steve K. Choi, Susan E. Clark, Mark Devlin, Jo Dunkley, P. A. Gallardo, Yilun Guan, Allen Foster, Matthew Hasselfield, Carlos Hervías-Caimapo, Matt Hilton, Adam D. Hincks, Anna Y. Q. Ho, John C. Hood II, Kevin M. Huffenberger, Arthur Kosowsky, Michael D. Niemack, John Orlowski-Scherer, Lyman Page, Bruce Partridge, Maria Salatino, Cristóbal Sifón, Suzanne T. Staggs, Cristian Vargas, Edward J. Wollack

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Abstract

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 find 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 which is in tension with current models.

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阿塔卡马宇宙学望远镜：单一观测图的系统瞬变搜索

我们利用阿塔卡马宇宙学望远镜（ACT）的数据对天体物理瞬变进行了系统搜索。这些数据拍摄于 2017 年至 2022 年，在 77 千兆赫到 277 千兆赫的三个频段上。在本文中，我们提出了一条利用单次观测地图进行瞬变探测的路线，地图的每个像素包含一次观测，积分时间约为四分钟。我们在 27 个独特位置发现了 34 个瞬变事件。除两个瞬态事件外，所有瞬态事件都与银河系恒星有关，并表现出多种特性。我们还探测到一个与经典新星 YZRet 相吻合的事件，以及一个与闪烁的活动星系核相吻合的事件。值得注意的是，我们没有探测到伽马射线暴的反向冲击发射，这与目前的模型不符。

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arXiv - PHYS - Solar and Stellar Astrophysics

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