论文标题
潮汐破坏事件的无线电监视Swift J16449.3+573451。 iv。持续衰落和非权威主义扩张
Radio Monitoring of the Tidal Disruption Event Swift J164449.3+573451. IV. Continued Fading and Non-Relativistic Expansion
论文作者
论文摘要
我们介绍了对以前相对论的潮汐破坏事件（TDE）的持续无线电和X射线观察，Swift J164449.3+573451（\ sw）（\ sw）延伸到约9。4年后，这是詹斯基（Jansky）正在进行的竞选活动的一部分，这是詹斯基（Jansky）非常大的阵列（vla）（vla）和\ textit \ textit {chandit {chandra} x-ray} x-ray} x-ray。我们发现，X射线排放已逐渐淡出可检测的水平，上限为$ \ Lessim 3.5 \ times 10^{ - 15} $ erg cm $^{ - 2} $ s $ s $^{ - 1} $在100 ks的观察中，而无线电发射仍在检测并稳定地效仿。两者都与非相关性流出的正向冲击排放一致，尽管我们发现，在这些后期，无线电光谱能量分布更适合$ p \ 3 $的电子功率定律指数（而不是$ p \ p \ time time times times）。 With the revised spectral index we find $ε_B\approx 0.01$ using the radio and X-ray data, and a density of $\approx 0.04$ cm$^{3}$ at a radius of $R\approx 0.65$ pc ($R_{\rm sch}\approx 2\times 10^6$ R$_\odot$) from the black hole. BlastWave的能量尺度为$ \ of 10^{52} $ erg。我们还报告了VLA Sky Survey（Vlass）的前两个时期的3 GHz的检测，并发现$ \ sim 10^2 $ off-Axis \ sw样事件到$ z \ sim 0.5 $可能存在Vlass Data中。最后，我们发现在无线电频率下，\ sw \本身将保持数十年的时间，尽管在Sub-GHz频率上的观察对于表征其动力学演化将变得越来越重要。
We present continued radio and X-ray observations of the previously relativistic tidal disruption event (TDE) Swift J164449.3+573451 (\sw) extending to about 9.4 years post disruption, as part of ongoing campaigns with the Jansky Very Large Array (VLA) and the \textit{Chandra} X-ray observatory. We find that the X-ray emission has faded below detectable levels, with an upper limit of $\lesssim 3.5\times 10^{-15}$ erg cm$^{-2}$ s$^{-1}$ in a 100 ks observation, while the radio emission continues to be detected and steadily fade. Both are consistent with forward shock emission from a non-relativistic outflow, although we find that the radio spectral energy distribution is better fit at these late times with an electron power law index of $p\approx 3$ (as opposed to $p\approx 2.5$ at earlier times). With the revised spectral index we find $ε_B\approx 0.01$ using the radio and X-ray data, and a density of $\approx 0.04$ cm$^{3}$ at a radius of $R\approx 0.65$ pc ($R_{\rm sch}\approx 2\times 10^6$ R$_\odot$) from the black hole. The energy scale of the blastwave is $\approx 10^{52}$ erg. We also report detections of \sw\ at 3 GHz from the first two epochs of the VLA Sky Survey (VLASS), and find that $\sim 10^2$ off-axis \sw-like events to $z\sim 0.5$ may be present in the VLASS data. Finally, we find that \sw\ itself will remain detectable for decades at radio frequencies, although observations at sub-GHz frequencies will become increasingly important to characterize its dynamical evolution.
