The Parsec-Scale Structure of NGC 1275 at 1.3 GHz
The Parsec-Scale Structure of NGC 1275 at 1.3 GHz
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1.3 GHz NGC 1275 的秒差距结构
DOI：
10.1086/309898
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
R. Vermeulen
中科院分区：
文献类型：
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作者：
G. Taylor;R. Vermeulen
我们提出了一个高动态范围甚长基线阵列（VLBA）的图像3C 84在1.3 GHz。通过这些观测，我们发现了一个以前未被探测到的成分，它位于致密核心以南约65质量，直径约40质量。因此，3C 84的核心显示了无线电发射，从核心向外的总长度为0.“1（24 h-1 pc），这是中央引擎在1960年最近一次大爆发之前的几个世纪中活动的明确证据。从没有显着的发射到核心的北部，我们发现，在1.3 GHz的自由-自由光学深度可能是≥3.7在3.5 h-1 pc的投影距离。
We present a high dynamic range Very Long Baseline Array (VLBA) image of 3C 84 at 1.3 GHz. With these observations we have discovered a previously undetected component that is centered ~65 mas to the south of the compact core and has a diameter of ~40 mas. The nucleus of 3C 84 thus displays radio emission without interruption from the core out to a total length of 0.″1 (24 h-1 pc), which is clear evidence for activity of the central engine in the centuries preceding the latest large outburst in 1960. From the absence of significant emission to the north of the core we find that the free-free optical depth at 1.3 GHz is likely to be ≥3.7 at a projected distance of 3.5 h-1 pc.