M81快速射电暴宿主球状星团特别吗?

IF 8.8 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Astrophysical Journal Letters Pub Date : 2023-11-01 DOI:10.3847/2041-8213/ad03e4
Kristen C. Dage, Arash Bahramian, Clancy W. James, Arunav Kundu, Katherine L. Rhode, Jay Strader, Enrico Vesperini, Stephen E. Zepf
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引用次数: 0

摘要

摘要利用哈勃太空望远镜(HST)的多波段观测资料,对快速射电暴FRB 20200120E所在的M81球状星团(GC)的光度和结构参数进行了测量。我们的最佳拟合King模型的有效半径r h = 3.06 pc,适度的King模型浓度c = 53,推断的核心半径为0.81 pc。我们重新审视了FRB在星团内的精确天文位置,发现FRB 20200120E距离中心1.92 pc,但在投影的半光半径内。我们估计了快速射电暴宿主的相对遭遇率,以及M81中其他210个gc的相应遭遇率,并将这些值与银河系gc的遭遇率进行了比较。快速射电暴位于一个GC中,在我们的两个比较样本中,它的遭遇率略高于恒星遭遇率的中位数。虽然估计的FRB宿主集群的遭遇率(例如,47 Tuc集群的~ 50%)足以允许FRB动态形成的可能性,但由于可用HST数据的限制以及比较数据中可能存在的系统不确定性和选择效应,我们的研究结果并未对这种情况施加强烈约束。
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Is the M81 Fast Radio Burst Host Globular Cluster Special?
Abstract We use multiband archival Hubble Space Telescope (HST) observations to measure the photometric and structural parameters of the M81 globular cluster (GC) that hosts the fast radio burst FRB 20200120E. Our best-fitting King model has an effective radius r h = 3.06 pc with a moderate King model concentration of c = 53, and an inferred core radius of 0.81 pc. We revisit the exact astrometric location of the FRB within the cluster, and find that FRB 20200120E is located 1.92 pc from the center, but within the projected half-light radius. We estimate the relative encounter rate of the FRB host, along with the corresponding rates of 210 other GCs in M81, and compare these values with the encounter rates of Galactic GCs. The FRB resides in a GC with an encounter rate that is moderately higher than the median stellar encounter rate in our two comparison samples. While the estimated encounter rate of the FRB host cluster (e.g., ∼50% of a cluster like 47 Tuc) is sufficient to allow the possibility that the FRB formed dynamically, our results do not place strong constraints on this scenario due to the limitations of the available HST data and the possible systematic uncertainties and selection effects in the comparison data.
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来源期刊
Astrophysical Journal Letters
Astrophysical Journal Letters ASTRONOMY & ASTROPHYSICS-
CiteScore
14.10
自引率
6.30%
发文量
513
审稿时长
2-3 weeks
期刊介绍: The Astrophysical Journal Letters (ApJL) is widely regarded as the foremost journal for swiftly disseminating groundbreaking astronomical research. It focuses on concise reports that highlight pivotal advancements in the field of astrophysics. By prioritizing timeliness and the generation of immediate interest among researchers, ApJL showcases articles featuring novel discoveries and critical findings that have a profound effect on the scientific community. Moreover, ApJL ensures that published articles are comprehensive in their scope, presenting context that can be readily comprehensible to scientists who may not possess expertise in the specific disciplines covered.
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