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arXiv 1012.5092astro-ph.HE
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超新星1987 A射电遗迹的首次VLBI探测:小尺度特征的证据

First VLBI Detection of the Radio Remnant of Supernova 1987A: Evidence for Small-scale Features

C. -Y. Ng, T. M. Potter, L. Staveley-Smith, S. Tingay, B. M. Gaensler, C. Phillips, A. K. Tzioumis, G. Zanardo

摘要:

本文对超新星1987 A射电遗迹的首次甚长基线干涉测量(VLBI)探测进行了详细的分析。2007年和2008年分别在1.4和1.7 GHz拍摄的VLBI数据提供了对0.1”至0.7”角标度敏感的图像,这是迄今为止在射频上的最高分辨率。结果显示,两个扩展的叶与整体形态一致的观测在较低的分辨率。我们发现的证据,小规模的功能,在无线电壳,其中可能包括紧凑的团块附近的壳的内表面。这些特征具有小于0.2”的角范围,并且贡献小于总剩余通量密度的13%。在VLBI图像中没有发现中心源。我们把一个3-西格玛通量密度限制为0.3毫焦耳对任何脉冲星或脉冲星风星云在1.7 GHz。

英文摘要:

We present a detailed analysis of the first very long baseline interferometry (VLBI) detection of the radio remnant of supernova 1987A. The VLBI data taken in 2007 and 2008 at 1.4 and 1.7 GHz, respectively, provide images sensitive to angular scales from 0.1" to 0.7", the highest resolution to date at radio frequencies. The results reveal two extended lobes with an overall morphology consistent with observations at lower resolutions. We find evidence of small-scale features in the radio shell, which possibly consist of compact clumps near the inner surface of the shell. These features have angular extent smaller than 0.2" and contribute less than 13% of the total remnant flux density. No central source is detected in the VLBI images. We place a 3-sigma flux density limit of 0.3 mJy on any pulsar or pulsar wind nebula at 1.7 GHz.

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