A fast radio burst in the direction of the Virgo cluster
Devansh Agarwal, Duncan R. Lorimer, Anastasia Fialkov, Keith W. Bannister, Ryan M. Shannon, Wael Farah, Shivani Bhandari, Jean-Pierre Macquart, Chris Flynn, Giu… 展开作者
Devansh Agarwal, Duncan R. Lorimer, Anastasia Fialkov, Keith W. Bannister, Ryan M. Shannon, Wael Farah, Shivani Bhandari, Jean-Pierre Macquart, Chris Flynn, Giuliano Pignata, Nicolas Tejos, Benjamin Gregg, Stefan Osłowski, Kaustubh Rajwade, Mitchell B. Mickaliger, Benjamin W. Stappers, Di Li, Weiwei Zhu, Lei Qian, Youling Yue, Pei Wang, Abraham Loeb
备注:
9 pages, 6 figures, Accepted for publication in MNRAS
如果本征微弱的快速射电暴(FRB)数量众多,那么邻近星系团方向的快速射电暴(FRB)速率预计将高于平均宇宙学速率。在本文中,我们描述了一个有针对性的搜索附近的室女星系团的核心微弱FRB使用澳大利亚平方公里阵列探路者望远镜。在300小时的观测过程中,我们发现了一个爆发,FRB 180417,其色散测量值为DM $=474.8$ cm $^{-3}$ pc。FRB被几台射电望远镜跟踪了27小时,但没有发现重复爆发。使用PROMPT 5望远镜对FRB 180417进行的光学跟踪显示,在$R$波段20.1等以下没有发现新的来源。我们认为FRB 180417可能位于室女星系团的后面,因为银河系和星系团内的DM贡献与FRB的DM相比很小,并且视线中没有星系。未探测到来自室女座的FRB限制了FRB光度函数的暗端斜率$α<1.52$(在68%置信限)和最小光度$L_{\rm min}\gtrsim 2\times 10^{40}$ erg s $^{-1}$(在68%置信限),假设$10^4$ FRB的宇宙FRB率天空$^{-1}$日$^{-1}$,流量超过1 Jy,位于红移为1的位置。进一步的FRB调查的星系团与高灵敏度的仪器将收紧约束的光度函数的暗端,因此,强烈鼓励。
英文摘要:
The rate of fast radio bursts (FRBs) in the direction of nearby galaxy clusters is expected to be higher than the mean cosmological rate if intrinsically faint FRBs are numerous. In this paper, we describe a targeted search for faint FRBs near the core of the Virgo cluster using the Australian Square Kilometer Array Pathfinder telescope. During 300 hr of observations, we discovered one burst, FRB 180417, with dispersion measure DM $=474.8$ cm$^{-3}$pc. The FRB was promptly followed up by several radio telescopes for 27 h, but no repeat bursts were detected. An optical follow-up of FRB 180417 using the PROMPT5 telescope revealed no new sources down to an $R$-band magnitude of 20.1. We argue that FRB 180417 is likely behind the Virgo cluster as the Galactic and intracluster DM contribution are small compared to the DM of the FRB, and there are no galaxies in the line of sight. The non-detection of FRBs from Virgo constrains the faint-end slope, $α<1.52$ (at 68\% confidence limit), and the minimum luminosity, $L_{\rm min}\gtrsim 2\times 10^{40}$ erg s$^{-1}$ (at 68\% confidence limit), of the FRB luminosity function assuming cosmic FRB rate of $10^4$ FRBs sky$^{-1}$ day$^{-1}$ with flux above 1 Jy located out to redshift of 1. Further FRB surveys of galaxy clusters with high-sensitivity instruments will tighten the constraints on the faint end of the luminosity function and, thus, are strongly encouraged.
Searches for inspiral gravitational waves associated with short gamma-ray bursts in LIGO's fifth and Virgo's first science run
两个致密物体的合并,比如两颗中子星或一颗中子星和一个黑洞,很可能是短伽马射线暴的起源。这些事件也是有希望的引力波来源,目前正在激发国际引力波探测器网络的相关搜索。在这里,我们描述了一个搜索的引力波从螺旋阶段的两个合并紧凑的对象,在巧合的短伽玛射线暴发生在LIGO的第五次科学运行和处女座的第一次科学运行。这次搜索包括22个GRB,这些GRB的数据来自LIGO/Virgo网络中的多个探测器。没有发现统计上显著的引力波候选者,参数检验表明在我们的伽玛暴样本中没有多余的弱引力波信号。90%~ C. L.在中子星-黑洞祖先模型假设下,我们的样本中伽玛暴的中位排斥距离为6.7 Mpc。
Searching for gravitational waves from compact binary mergers powering long gamma-ray bursts during LIGO-Virgo-KAGRA's O3 run
Monash University(莫纳什大学);OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery(引力波发现ARC卓越中心);Princeton University(普林斯顿大学);University of Cambridge(剑桥大学)
The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. VIII. A Comparison to Cosmological Short-duration Gamma-ray Bursts
A new fast radio burst in the datasets containing the Lorimer burst
利用Parkes 64 m口径射电望远镜的多波束接收机,在1.4GHz的麦哲伦云观测资料中,发现了一个新的快速射电暴(FRB~010312)。这些数据集包括洛里默爆发(FRB~010724),它早于日期,我们也重新检测。新的爆发具有更高的色散测量值1187 cm $^{-3}$ pc。该爆发是迄今为止发现的最广泛的爆发之一,是已知的第二早的FRB,也是第九个发现的分散测量值大于1000 cm $^{-3}\,$ pc的FRB。我们的发现表明,在现有的帕克斯数据档案中可能还有更多的爆发事件。
Circularly polarized radio emission from the repeating fast radio burst source FRB 20201124A
产生快速射电暴(FRB)辐射的机制还知之甚少。有针对性地监测重复FRB源提供了机会,以一次性突发不可能的方式充分表征发射特性。在这里,我们报告了FRB 20201124 A源的观测结果,澳大利亚平方公里阵列探路者(ASKAP)和帕克斯64米射电望远镜(Murriyang)的超宽带低(UWL)接收器。该源在2021年4月初进入了一个发射明亮爆发的时期。我们已经探测到了16个来自这个源的爆发。ASKAP探测到的爆发之一是从重复FRB源观测到的最亮爆发,推断通量为$640\pm70$ μ ms。在Parkes UWL探测到的五个爆发中,没有一个显示出1.1- 4 GHz范围内的任何发射。所有的UWL爆发都是高度极化的,它们的法拉第旋转测量(RM)显示出明显的变化。我们得到了一个平均RM的$-614$ rad m $^{-2}$的FRB源的$16$ rad m $^{-2}$在UWL爆发的标准偏差。在其中一个UWL爆发中,我们看到了显著的圆偏振发射的证据,其分数范围为$47\pm1$ %。如此高的圆偏振度在重复FRB源的爆发中从未见过。我们还看到了在这个UWL重复突发脉冲轮廓中的线性偏振位置角的显著变化的证据。重复脉冲群发射的模型需要考虑脉冲群极化特性的多样性。
Low-energy Radio Bursts from Magnetar XTE J1810$-$197: Implications for Fast Radio Bursts
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research(国家射电天文中心,塔塔基础研究所);Center for Astrophysics & Space Science (CASS), NYU Abu Dhabi(天体物理学与空间科学中心,纽约大学阿布扎比分校);Department of Physics, New York University(物理系,纽约大学);Center for Cosmology and Particle Physics (CCPP, Affiliate), New York University(宇宙学与粒子物理中心(附属),纽约大学)
A bright wideband radio burst from the isolated neutron star 2XMM J104608.7$-$594306
The University of Manchester(曼彻斯特大学);The University of Oxford(牛津大学);ASTRON, the Netherlands Institute for Radio Astronomy(荷兰射电天文研究所);Anton Pannekoek Institute, University of Amsterdam(阿姆斯特丹大学安东·潘内科克研究所);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)
The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. VI. Radio Constraints on a Relativistic Jet and Predictions for Late-Time Emission from the Kilonova Ejecta