论文标题
NGC 2082的无线电连续研究
A Radio Continuum Study of NGC 2082
论文作者
论文摘要
我们使用ASKAP，ATCA和Parkes望远镜从888 MHz到9000 MHz介绍了NGC 2082的无线电连续观测。大约20个Arcsec来自附近螺旋星系的中心，我们发现了一个明亮而紧凑的无线电源J054149.24-641813.7，是未知来源的。为了限制J054149.24-641813.7的性质，我们搜索了具有超宽带低parkes接收器的瞬态事件，并将其光度和光谱指数与附近的各种超新星残留物（SNR）和快速无线电爆发（FRB）进行比较。其无线电光谱指数是平坦的（$α= 0.02 \ pm 0.09 $），不太可能是SNR或PULSAR。在三天的观察结果中，未检测到Parkes望远镜的瞬态事件，我们的计算显示J054149.24-641813.7比与FRB 121102＆190520b相关的持续无线电源的持续无线电源少两个数量级。我们发现，在NGC 2082背后找到这样的来源的概率为P = 1.2％，得出结论，J054149.24-641813.7最有可能的起源是背景类星体或射电星系。
We present radio continuum observations of NGC 2082 using ASKAP, ATCA and Parkes telescopes from 888 MHz to 9000 MHz. Some 20 arcsec from the centre of this nearby spiral galaxy, we discovered a bright and compact radio source, J054149.24-641813.7, of unknown origin. To constrain the nature of J054149.24-641813.7, we searched for transient events with the Ultra-Wideband Low Parkes receiver, and compare its luminosity and spectral index to various nearby supernova remnants (SNRs), and fast radio burst (FRB) local environments. Its radio spectral index is flat ($α = 0.02 \pm 0.09$) which is unlikely to be either an SNR or pulsar. No transient events were detected with the Parkes telescope over three days of observations, and our calculations show J054149.24-641813.7 is two orders of magnitude less luminous than the persistent radio sources associated with FRB 121102 & 190520B. We find that the probability of finding such a source behind NGC 2082 is P = 1.2%, and conclude that the most likely origin for J054149.24-641813.7 is a background quasar or radio galaxy.
