标题： 甚长基线干涉观测的年轻Ⅱ型超新星 显示英文标题

标题： VLBI observations of young Type II supernovae

摘要： 我们综述了通过甚长基线干涉测量（VLBI）观测所看到的年轻II型超新星中的恒星际相互作用。 这类观测所达到的分辨率（优于1毫角秒）是探测超新星爆发后发生的相互作用的强大工具。 直接成像超新星原则上可以估算其膨胀减速，并获得喷出物和恒星际密度分布的信息，以及超新星中磁场强度和相对论粒子能量密度的估计值。 不幸的是，只有少数几个射电超新星足够靠近且明亮到可以通过VLBI进行研究。 我们展示了对我们附近的II型射电超新星SN1986J和SN2001gd的高分辨率观测结果。 显示英文摘要

摘要： We give an overview of circumstellar interaction in young Type II supernovae, as seen through the eyes of very-long-baseline interferometry (VLBI) observations. The resolution attained by such observations (best than 1 mas) is a powerful tool to probe the interaction that takes place after a supernova goes off. The direct imaging of a supernova permits, in principle, to estimate the deceleration of its expansion, and to obtain information on the eject and circumstellar density profiles, as well as estimates of the magnetic field intensity and relativistic particle energy density in the supernova. Unfortunately, only a handful of radio supernovae are close and bright enough as to permit their study with VLBI. We present results from our high-resolution observations of the nearby Type II radio supernovae SN1986J and SN2001gd.