A sample of fast radio bursts discovered and localized with MeerTRAP at the MeerKAT telescope
A sample of fast radio bursts discovered and localized with MeerTRAP at the MeerKAT telescope
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MeerKAT 望远镜中的 MeerTRAP 发现并定位的快速射电爆发样本
DOI：
10.1093/mnras/stad2041
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发表时间：
2023
影响因子：
4.8
通讯作者：
Surnis, M. P.
中科院分区：
文献类型：
--
作者：
Jankowski, F.;Bezuidenhout, M. C.;Caleb, M.;Driessen, L. N.;Malenta, M.;Morello, V.;Rajwade, K. M.;Sanidas, S.;Stappers, B. W.;Surnis, M. P.
我们提出了一个样本，以及本地化的快速射电暴（FRB）发现的MeerTRAP项目在theMeerKAT望远镜在南非。我们发现了三个FRB在单一的相干捆绑阵列光束和本地化他们的面积为101 arcmin 2。我们调查他们的突发特性，散射，重复率，和本地化在多波长的上下文中。FRB 20201211 A显示出散射增宽的迹象，但在其他方面与仪器色散拖尾一致。对于FRB 20210202 D，我们发现了一个微弱的后标爆发，间隔为1.200 ms，这表明一个独特的爆发成分或重复脉冲。我们试图将FRB与宿主星系候选者联系起来。对于FRB 20210408 H，我们初步（0.35-0.53概率）确定了一个红移为0.5的相容宿主。此外，我们分析了MeerTRAP调查的属性，如调查覆盖范围，通量完整性，以及它们对FRB人群的影响。基于截至2021年底发现的11个MeerTRAP FRB的整个样本，我们估计了FRB的全天速率及其与通量阈值的比例。在1.28 GHz频率上，相干和非相干观测的FRB全天速率分别为0.66和3.44 μ ms。MeerTRAP率之间的比例比1.4σ水平下更高注量时更平坦。似乎有一个赤字的低注量FRB，表明率与注量的关系低于2焦耳ms的中断或翻转。我们推测宇宙或祖先的内在起源。我们调查中的累积源计数似乎与欧几里得标度一致。
We present a sample of well-localized fast radio bursts (FRBs) discovered by the MeerTRAP project at theMeerKATtelescope in South Africa. We discovered the three FRBs in single coherent tied-array beams and localized them to an area of ∼1 arcmin2. We investigate their burst properties, scattering, repetition rates, and localizations in a multiwavelength context. FRB 20201211A shows hints of scatter broadening but is otherwise consistent with instrumental dispersion smearing. For FRB 20210202D, we discovered a faint post-cursor burst separated by ∼200 ms, suggesting a distinct burst component or a repeat pulse. We attempt to associate the FRBs with host galaxy candidates. For FRB 20210408H, we tentatively (0.35–0.53 probability) identify a compatible host at a redshift ∼0.5. Additionally, we analyse the MeerTRAP survey properties, such as the survey coverage, fluence completeness, and their implications for the FRB population. Based on the entire sample of 11 MeerTRAP FRBs discovered by the end of 2021, we estimate the FRB all-sky rates and their scaling with the fluence threshold. The inferred FRB all-sky rates at 1.28 GHz areandabove 0.66 and 3.44 Jy ms for the coherent and incoherent surveys, respectively. The scaling between the MeerTRAP rates is flatter than at higher fluences at the 1.4σ level. There seems to be a deficit of low-fluence FRBs, suggesting a break or turn-over in the rate versus fluence relation below 2 Jy ms. We speculate on cosmological or progenitor-intrinsic origins. The cumulative source counts within our surveys appear consistent with the Euclidean scaling.