论文标题
SN 2014C：VLBI图像显示了壳结构和减速扩展
SN 2014C: VLBI image shows a shell structure and decelerated expansion
论文作者
论文摘要
我们报告了新的非常长的基线干涉法无线电测量2014C在螺旋星系NGC 7331中，爆炸后用欧洲VLBI网络〜5年制造，以及用jansky非常大的阵列（VLA）制成的磁通量密度测量。 SN 2014c是一个不寻常的超新星，最初是IB型，但在约1年的过程中，它发展出强大的H $α$线，这意味着与某些H-Rich Interellar培养基（CSM）的强烈相互作用开始。不断扩大的冲击前期与第一年的杂色材料相互作用，但现在已经从密集的壳中出现，并且正在扩展到较低的密度CSM之外。我们的新VLBI观察结果显示出相对清晰的壳结构和持续的扩张，并有一些减速，并建议最新减速在增加。我们的多频VLA观察结果显示了一个相对平坦的PowerLaw频谱，$S_ν\ Propto c n { - 0.56 \ pm 0.03} $，并且由于$ t \ sim1 $ yr，无线电发光性没有下降。
We report on new Very Long Baseline Interferometry radio measurements of supernova 2014C in the spiral galaxy NGC 7331, made with the European VLBI Network ~5 yr after the explosion, as well as on flux density measurements made with the Jansky Very Large Array (VLA). SN 2014C was an unusual supernova, initially of Type Ib, but over the course of ~1 yr it developed strong H$α$ lines, implying the onset of strong interaction with some H-rich circumstellar medium (CSM). The expanding shock-front interacted with a dense shell of circumstellar material during the first year, but has now emerged from the dense shell and is expanding into the lower density CSM beyond. Our new VLBI observations show a relatively clear shell structure and continued expansion with some deceleration, with a suggestion that the deceleration is increasing at the latest times. Our multi-frequency VLA observations show a relatively flat powerlaw spectrum with $S_ν\propto ν^{-0.56 \pm 0.03}$, and show no decline in the radio luminosity since $t\sim1$ yr.
