arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.04217astro-ph.HE
收藏

GBNCC调查首次发现350 MHz快速射电暴

First Discovery of a Fast Radio Burst at 350 MHz by the GBNCC Survey

E. Parent, P. Chawla, V. M. Kaspi, G. Y. Agazie, H. Blumer, M. DeCesar, W. Fiore, E. Fonseca, J. W. T. Hessels, D. L. Kaplan, V. I. Kondratiev, M. LaRose, L. Le… 展开作者

E. Parent, P. Chawla, V. M. Kaspi, G. Y. Agazie, H. Blumer, M. DeCesar, W. Fiore, E. Fonseca, J. W. T. Hessels, D. L. Kaplan, V. I. Kondratiev, M. LaRose, L. Levin, E. F. Lewis, R. S. Lynch, A. E. McEwen, M. A. McLaughlin, M. Mingyar, H. Al Noori, S. M. Ransom, M. S. E. Roberts, A. Schmiedekamp, C. Schmiedekamp, X. Siemens, R. Spiewak, I. H. Stairs, M. Surnis, J. Swiggum, J. van Leeuwen

摘要:

本文报道了绿岸北天帽脉冲星巡天首次发现的快速射电暴(FRB 20200125 A)。FRB 20200125 A是在银河系纬度58.43度被探测到的,其色散测量值为179 pc cm $^{-3}$,而电子密度模型预测沿着这条视线的最大银河系贡献为25 pc cm $^{-3}$。此外,没有明显的银河系前景源的电离气体,可以解释过量的DM是可见的,在多波长调查的这一地区。这表明源是河外的。主星系的最大红移是$z_{max}=0.17$,对应的最大同向运动距离约为750 Mpc。FRB 20200125A的测量峰值通量密度为0.37焦耳,我们测量的脉冲宽度为3.7毫秒,与在较高频率下观察到的FRB宽度分布一致。基于这种检测,并假设FRB的欧几里德通量密度分布,我们计算出$^{-1}$天$^{-1}$的$3.4^{+15.4}_{-3.3} \times 10^3$ FRB在350 MHz的全天速率高于0.42 Jy的峰值通量密度,对于具有5 ms的固有宽度的未散射脉冲,与在更高频率下报告的速率一致。鉴于我们的单脉冲搜索管道的最新改进,我们还重新审视了GBNCC调查对各种突发属性的敏感性。最后,我们没有发现FRB 20200125A星际散射的证据,增加了越来越多的证据表明,一些FRB有环爆环境,自由自由吸收和散射并不显着。

英文摘要:

We report the first discovery of a fast radio burst (FRB), FRB 20200125A, by the Green Bank Northern Celestial Cap (GBNCC) Pulsar Survey conducted with the Green Bank Telescope at 350 MHz. FRB 20200125A was detected at a Galactic latitude of 58.43 degrees with a dispersion measure of 179 pc cm$^{-3}$, while electron density models predict a maximum Galactic contribution of 25 pc cm$^{-3}$ along this line of sight. Moreover, no apparent Galactic foreground sources of ionized gas that could account for the excess DM are visible in multi-wavelength surveys of this region. This argues that the source is extragalactic. The maximum redshift for the host galaxy is $z_{max}=0.17$, corresponding to a maximum comoving distance of approximately 750 Mpc. The measured peak flux density for FRB 20200125A is 0.37 Jy, and we measure a pulse width of 3.7 ms, consistent with the distribution of FRB widths observed at higher frequencies. Based on this detection and assuming an Euclidean flux density distribution of FRBs, we calculate an all-sky rate at 350 MHz of $3.4^{+15.4}_{-3.3} \times 10^3$ FRBs sky$^{-1}$ day$^{-1}$ above a peak flux density of 0.42 Jy for an unscattered pulse having an intrinsic width of 5 ms, consistent with rates reported at higher frequencies. Given the recent improvements in our single-pulse search pipeline, we also revisit the GBNCC survey sensitivity to various burst properties. Finally, we find no evidence of interstellar scattering in FRB 20200125A, adding to the growing evidence that some FRBs have circumburst environments where free-free absorption and scattering are not significant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑