Hydrodynamic simulations of the interaction of supernova shock waves with a clumpy environment: the case of the RX J0852.0-4622 (Vela Jr) supernova remnant
M. Obergaulinger, A. Iyudin, E. Müller, G. F. Smoot
Observations in all electromagnetic bands show that many supernova remnants (SNRs) have a very aspherical shape. This can be the result of asymmetries in the supernova explosion or a clumpy circumstellar medium. We study the generation of inhomogeneities and the mixing of elements arising from these two sources in multidimensional hydrodynamic simulations of the propagation of a supernova blast wave into a cloudy environment. We model a specific SNR, Vela Jr (RX J0852.0-4622). By comparing our results with recent observations, we can constrain the properties of the explosion. We find that a very energetic explosion of several 10^{51} erg occurring roughly about 800 years ago is consistent with the shape and emission of the SNR, as well as a supernova with an energy closer to the canonical value of 10^{51} erg a few thousand years ago.
Unveiling Vela - Time Variability of Na I D lines in the Direction of the Vela Supernova Remnant
本文给出了船帆座超新星遗迹方向上从星际介质到64颗恒星的Na I D线的高分辨率光谱剖面。这项调查主要是在2011-12年之间进行的,补充了Cha & Sembach在1993-96年期间对相同恒星的早期调查。15至18年的间隔为寻找星际轮廓的变化提供了一个基线。在15-18年的时间里,在低径向速度下,三颗恒星-- HD 63578、HD 68217、HD 76161 --的强吸收分量急剧消失; HD 68217和HD 76161与船帆座SNR相关,但HD 63578可能与g2 Velorum的风泡相关。这些冷中性云在短短15到18年的时间里消失,需要一些解释。其他变化被认为是在高速Na-D组件。
Unveiling Vela -- Variability of Interstellar Lines in the Direction of the Vela Supernova Remnant III. Na D and Ca II K
2017年至2019年,南部非洲大型望远镜在船帆座超新星遗迹的方向上获得了15颗恒星的高分辨率光谱。本文讨论了星际Ca i H、K和Na i D线。特别是,线配置文件进行比较,在1993-1996年获得的Cha和Sembach的光谱分辨率的配置文件。其中10条视线显示了该视线中一个或多个组件的变化。变化包括在两次观测期间之间的二十年间径向速度的微小变化(1-2公里/秒)和(或)等效宽度的增加/减少。Ca-K线的变化比Na-D线的变化更明显。这些变化归因于超新星喷出物和周围星际介质之间相互作用所扰动的气体。典型的时间尺度可以是20-50年。如前所述,遗迹表面线剖面的小尺度变化表明,相互作用的线性尺度是目前遗迹40 pc大小的一小部分。
Intertwined birth and death: a Herbig-Haro outflow resolves the distance to Vela Junior
University of Manitoba(曼尼托巴大学);Australian National University(澳大利亚国立大学);Haverford College(哈弗福德学院);Towson University(陶森大学);National Chengchi University(国立政治大学)