Evidence for a BL Lac nucleus in Centaurus A

Evidence for a BL Lac nucleus in Centaurus A
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半人马座 A 中存在 BL Lac 核的证据

DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
Z. Tsvetanov
Z. Tsvetanov
中科院分区：
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文献类型：
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作者：
R. Morganti;R. Fosbury;R. Hook;A. Robinson;Z. Tsvetanov

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给出了邻近射电星系半人马座A中突出发射线细丝的详细电离图（[O III] λ5007/Hα）。这张图揭示了惊人的电离结构，最好的解释是来自原子核方向的电离光子。这一新证据直接支持了最近一项研究的结论，即细丝是由源自原子核的强大辐射束光电离的。有人提出，半人马座A可能有一个方向错误的BL Lac天体，正如将这些天体与FR I射电星系的母星系群联系起来的统一方案所预测的那样
A detailed ionization map ([O III] λ5007/Hα) of the prominent emission-line filaments in the nearby radio galaxy Centaurus A is presented. The map reveals striking ionization structure which is best explained by ionizing photons arriving from the direction of the nucleus. This new evidence adds direct support to the conclusion of a recent study that the filaments are photoionized by a powerful radiation beam originating in the nucleus. It is suggested that Centaurus A may harbour a misdirected BL Lac object, as predicted by unified schemes relating these objects to a parent population of FR I radio galaxies