论文标题
最低频率快速无线电爆发：Sardinia射程望远镜检测周期性FRB 180916在328 MHz时
The lowest frequency Fast Radio Bursts: Sardinia Radio Telescope detection of the periodic FRB 180916 at 328 MHz
论文作者
论文摘要
我们报道了迄今为止，距离萨迪尼亚射电望远镜（SRT）的最低频率检测到快速无线电爆发FRB 180916的三爆发。 SRT观察了从2020年2月2020日至24日，在主动无线电爆发的时间间隔内观察到定期中继器FRB 180916，五天，并在观察的第一个小时中检测到了三次爆发；在剩下的30小时内未发现更多的爆发。 1548 MHz的同时进行SRT观测结果未检测到任何爆发。爆发的爆发范围在37至13 JY MS的范围内。对于这些爆发，未观察到相关的散射。我们还介绍了在活动窗口的五天内，我们在FRB 180916上执行的多波长活动的结果。与SRT观测值同时，其他具有不同时间跨度的人是在408 MHz的Northern Cross上进行的，XMM-Newton，XMM-NEWTON，MICER，Integral，Antegral，Agile，TNG和TNG和两个Asiago的光学望远镜，配备了快速光度计。 XMM-Newton同时获得了SRT检测到的三个爆发的数据，并确定了在0.3-10 KEV能量范围内的光度上限〜$ 10^{45} $ erg/s，用于爆发。敏捷同时获得数据，并确定了MEV范围内的通力上限为$ 10^{ - 8} $ erg cm $ $^{ - 2} $。我们的结果表明，从Circumburst介质中的吸收并没有显着影响FRB 180916的发射，从而限制了frb 180916的限制，并且可以限制一个超级效果。如果存在爆裂机制，则必须处于较低的频率。我们的多波长广告系列敏感地限制了FRB 180916的宽带发射，并为迄今为止对电磁响应的最佳限制提供了对这一出色的快速无线电爆发来源的无线电爆发的响应。
We report on the lowest-frequency detection to date of three bursts from the fast radio burst FRB 180916, observed at 328 MHz with the Sardinia Radio Telescope (SRT). The SRT observed the periodic repeater FRB 180916 for five days from 2020 February 20 to 24 during a time interval of active radio bursting, and detected the three bursts during the first hour of observations; no more bursts were detected during the remaining ~ 30 hours. Simultaneous SRT observations at 1548 MHz did not detect any bursts. Burst fluences are in the range 37 to 13 Jy ms. No relevant scattering is observed for these bursts. We also present the results of the multi-wavelength campaign we performed on FRB 180916, during the five days of the active window. Simultaneously with the SRT observations, others with different time spans were performed with the Northern Cross at 408 MHz, with XMM-Newton, NICER, INTEGRAL, AGILE, and with the TNG and two optical telescopes in Asiago, which are equipped with fast photometers. XMM-Newton obtained data simultaneously with the three bursts detected by the SRT, and determined a luminosity upper limit in the 0.3-10 keV energy range of ~$10^{45}$ erg/s for the burst emission. AGILE obtained data simultaneously with the first burst and determined a fluence upper limit in the MeV range for millisecond timescales of $ 10^{-8}$ erg cm$^{-2}$.Our results show that absorption from the circumburst medium does not significantly affect the emission from FRB 180916, thus limiting the possible presence of a superluminous supernova around the source, and indicate that a cutoff for the bursting mechanism, if present, must be at lower frequencies. Our multi-wavelength campaign sensitively constrains the broadband emission from FRB 180916, and provides the best limits so far for the electromagnetic response to the radio bursting of this remarkable source of fast radio bursts.
