标题： 附近明亮漩涡星系中的紧凑射电源研究。 II. M51源的多波段分析 显示英文标题

标题： A Study of Compact Radio Sources in Nearby Face-on Spiral Galaxies. II. Multiwavelength Analyses of Sources in M51

摘要： 我们报告了利用甚大天线阵对相互作用星系系统M51的深度射电观测分析结果，目的是理解近邻漩涡星系中致密射电源种群的性质。我们探测到107个致密射电源，其中64%在一幅深H$\alpha$Hubble空间望远镜图像中有光学对应体。有13个射电源在M51的一个{\em 查德雷}观测中具有X射线对应体。我们发现其中有6个相关的H$\alpha$源是具有分辨壳层的年轻超新星遗迹。大多数SNR表现出陡峭的射电连续谱谱指数，与同步辐射一致。 我们在超新星1994I爆炸近十年后探测到其发射：该发射（20厘米处为$160\pm22 \mu$Jy波束$^{-1}$，6厘米处为$46\pm11 \mu$Jy波束$^{-1}$，$\alpha=-1.02\pm0.28$）与Ib/Ic型超新星的光变曲线模型一致。我们探测到了来自超新星的X射线发射，但没有发现光学对应体。我们报告了对该星系中赛弗特2核的分析，包括中心黑洞存在双极喷流的证据。 显示英文摘要

摘要： We report the analysis of deep radio observations of the interacting galaxy system M51 from the Very Large Array, with the goal of understanding the nature of the population of compact radio sources in nearby spiral galaxies. We detect 107 compact radio sources, 64% of which have optical counterparts in a deep H$\alpha$ Hubble Space Telescope image. Thirteen of the radio sources have X-ray counterparts from a {\em Chandra} observation of M51. We find that six of the associated H$\alpha$ sources are young supernova remnants with resolved shells. Most of the SNRs exhibit steep radio continuum spectral indices onsistent with synchrotron emission. We detect emission from the Type Ic SN 1994I nearly a decade after explosion: the emission ($160\pm22 \mu$Jy beam$^{-1}$ at 20 cm, $46\pm11 \mu$Jy beam$^{-1}$ at 6cm, $\alpha=-1.02\pm0.28$) is consistent with light curve models for Type Ib/Ic supernovae. We detect X-ray emission from the supernova, however no optical counterpart is present. We report on the analysis of the Seyfert 2 nucleus in this galaxy, including the evidence for bipolar outflows from the central black hole.