论文标题
IA型SNR 0519-69.0中的密集，不均匀的室内介质的证据
Evidence for a Dense, Inhomogeneous Circumstellar Medium in the Type Ia SNR 0519-69.0
论文作者
论文摘要
我们通过使用2020年获得的新的HST WFC3图像的组合以及2010年和2011年的档案ACS图像进行了对LMC中SNR 0519 $ - $ 69.0的外部冲击的扩展研究。由于基线很长，因此我们的适当的运动测量是没有预见的准确性的。我们发现多种冲击速度，平均最快的冲击速度为5280 km/s，平均只有1670 km/s的冲击分组。我们将HST的H_ALPHA图像与来自Chandra的X射线图像和来自Spitzer的Mid-IR图像进行比较，发现在特定位置残留物的亮度与该位置的爆炸速度之间的亮度明显，这支持了X射线和IR发射的亮度与X射线和IR发射相互作用，这是由于与浓密的媒介相互作用而产生的。我们没有发现与最快的冲击相关的X射线发射，热或非热的证据，如果最快的速度是遇到LMC较低密度环境介质的爆炸波的结果，则没有预期的。我们得出了670 +/- 70年的残留年龄，与先前研究得出的结果一致。
We perform an expansion study of the Balmer dominated outer shock of the SNR 0519$-$69.0 in the LMC by using a combination of new HST WFC3 imagery obtained in 2020 and archival ACS images from 2010 and 2011. Thanks to the very long time baseline, our proper motion measurements are of unprecedented accuracy. We find a wide range of shock velocities, with the fastest shocks averaging 5280 km/s and the slowest grouping of shocks averaging just 1670 km/s. We compare the H_alpha images from HST with X-ray images from Chandra and mid-IR images from Spitzer, finding a clear anti-correlation between the brightness of the remnant in a particular location and the velocity of the blast wave at that location, supporting the idea that the bright knots of X-ray and IR emission result from an interaction with a dense inhomogeneous circumstellar medium. We find no evidence for X-ray emission, thermal or nonthermal, associated with the fastest shocks, as expected if the fastest velocities are the result of the blast wave encountering the lower density ambient medium of the LMC. We derive an age of the remnant of 670 +/- 70 yr, consistent with results derived from previous investigations.
