Energy function, formation rate, and low-metallicity environment of fast radio bursts
Energy function, formation rate, and low-metallicity environment of fast radio bursts
复制标题
快速射电暴的能量函数、形成速率和低金属环境
DOI：
10.1093/mnras/stz1566
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发表时间：
2019
影响因子：
4.8
通讯作者：
Wang F Y
中科院分区：
文献类型：
--
作者：
Zhang G Q;Wang F Y
在本文中，我们使用帕克斯样本和澳大利亚平方公里阵列探路者（ASKAP）样本研究了快速射电爆发（FRB）的能量函数、形成速率和环境。首次考虑了金属丰度对形成速率的影响。如果快速射电暴是由致密双星合并产生的，那么快速射电暴的形成速率相对于宇宙恒星形成速率（CSFR）应该有一个时间延迟。从红移累积分布中我们得到时间延迟约为3-5 Gyr，微分能量函数指数γ(dN/dE∝E−γ)在1.6至2.0之间。 γ的值与FRB 121102的值类似，这表明单个突发可以与中继器共享相同的物理机制。在另一种情况下，如果FRB的形成速率与没有时滞的SFR成正比，则指数γ约为2.3。在这两种情况下，我们发现FRB可能更喜欢发生在低金属丰度环境中，这与长伽马射线暴（GRB）和贫氢超光度超新星（SLSNe-I）的情况类似。
In this paper, we investigate the energy function, formation rate, and environment of fast radio bursts (FRBs) using Parkes sample and Australian Square Kilometer Array Pathfinder (ASKAP) sample. For the first time, the metallicity effect on the formation rate is considered. If FRBs are produced by the mergers of compact binaries, the formation rate of FRBs should have a time delay relative to cosmic star formation rate (CSFR). We get the time delay is about 3–5 Gyr and the index of differential energy functionγ(dN/dE∝E−γ) is between 1.6 and 2.0 from redshift cumulative distribution. The value ofγis similar to that of FRB 121102, which indicates single bursts may share the same physical mechanism with the repeaters. In another case, if the formation rate of FRB is proportional to the SFR without time delay, the indexγis about 2.3. In both cases, we find that FRBs may prefer to occur in low-metallicity environment with, which is similar to those of long gamma-ray bursts (GRBs) and hydrogen-poor superluminous supernovae (SLSNe-I).