论文标题
使用第一个Chime/FRB目录来推断快速无线电突发的能量和距离分布
Inferring the Energy and Distance Distributions of Fast Radio Bursts using the First CHIME/FRB Catalog
论文作者
论文摘要
快速无线电爆发（FRB）是无线电发射的简短，充满活力的，充满活力的闪光灯，其祖细胞在很大程度上是未知的。尽管研究FRB种群对于理解这些天体物理现象是如何发生的至关重要的，但是如果没有大量FRB和可特征性的观察偏见，这种研究很难进行。使用加拿大氢强度映射实验/快速无线电爆发（Chime/frb）合作的最近发布的536 FRB目录，我们对FRB种群进行了研究，该研究还校准了选择效果。假设Schechter发光性函数，我们推断出$ e_ \ mathrm {char} = $ 2.38^{+5.35} _ { - 1.64} \ times 10^{41} $ erg的特征能量临界值，$ 2.38^{+5.35} _ { - 1.64} \ times 10^{41}。同时，我们推断出[$ 7.3^{+8.8} _ { - 3.8} $（stat。）$^{+2.0} _ { - 1.8} $（sys。）$ \ times 10^4 $ gpc $ gpc $ gpc $^{ - 3} $ y-ear y-ey ythe a piv {3 $ eer and a piv at a piv and a piv and a piv and a piv and a piv and a piv a和eer在600 MHz时的散射时间尺度为10 ms，发现我们不能以恒星形成速率显着限制FRB种群的宇宙演化。建模宿主分散度度量（DM）贡献为对数正态分布，并假设总银河系贡献为80 pc cm $^{ - 3} $，我们发现中位价值为$ \ MATHRM {dm} _ \ MATHRM {host} = $ 84^= $ 84^{+69} $^$^$^$^$^39}通常在文献中使用。 FRB祖细胞的拟议模型应与我们结果预测的完整FRB种群的能量和丰富性一致。最后，我们推断出使用Chime检测到的FRB的红移分布，将通过即将到来的Chime/FRB Outiggers项目实现的本地化和红移进行测试。
Fast radio bursts (FRBs) are brief, energetic, extragalactic flashes of radio emission whose progenitors are largely unknown. Although studying the FRB population is essential for understanding how these astrophysical phenomena occur, such studies have been difficult to conduct without large numbers of FRBs and characterizable observational biases. Using the recently released catalog of 536 FRBs published by the Canadian Hydrogen Intensity Mapping Experiment/Fast Radio Burst (CHIME/FRB) collaboration, we present a study of the FRB population that also calibrates for selection effects. Assuming a Schechter luminosity function, we infer a characteristic energy cut-off of $E_\mathrm{char} =$ $2.38^{+5.35}_{-1.64} \times 10^{41}$ erg and a differential power-law index of $γ=$ $-1.3^{+0.7}_{-0.4}$. Simultaneously, we infer a volumetric rate of [$7.3^{+8.8}_{-3.8}$(stat.)$^{+2.0}_{-1.8}$(sys.)]$\times 10^4$ Gpc$^{-3}$ year$^{-1}$ above a pivot energy of 10$^{39}$ erg and below a scattering timescale of 10 ms at 600 MHz, and find we cannot significantly constrain the cosmic evolution of the FRB population with star formation rate. Modeling the host dispersion measure (DM) contribution as a log-normal distribution and assuming a total Galactic contribution of 80 pc cm$^{-3}$, we find a median value of $\mathrm{DM}_\mathrm{host} =$ $84^{+69}_{-49}$ pc cm$^{-3}$, comparable with values typically used in the literature. Proposed models for FRB progenitors should be consistent with the energetics and abundances of the full FRB population predicted by our results. Finally, we infer the redshift distribution of FRBs detected with CHIME, which will be tested with the localizations and redshifts enabled by the upcoming CHIME/FRB Outriggers project.
