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arXiv 1711.01751astro-ph.GA
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半人马座A中的喷流/风外流:AGN反馈的本地实验室

The jet/wind outflow in Centaurus A: a local laboratory for AGN feedback

B. McKinley, S. J. Tingay, E. Carretti, S. Ellis, J. Bland-Hawthorn, R. Morganti, J. Line, M. McDonald, S. Veilleux, R. Wahl Olsen, M. Sidonio, R. Ekers, A. R. … 展开作者

B. McKinley, S. J. Tingay, E. Carretti, S. Ellis, J. Bland-Hawthorn, R. Morganti, J. Line, M. McDonald, S. Veilleux, R. Wahl Olsen, M. Sidonio, R. Ekers, A. R. Offringa, P. Procopio, B. Pindor, R. B. Wayth, N. Hurley-Walker, G. Bernardi, B. M. Gaensler, M. Haverkorn, M. Kesteven, S. Poppi, L. Staveley-Smith

摘要:

我们提供了最近的射电星系半人马座A和它的宿主星系NGC 5128的新的射电和光学图像。我们的调查集中在北部的过渡区,在那里的能量传输从~5 kpc(~5 arcmin)尺度的北内叶(NIL)到~30 kpc(~30 arcmin)尺度的北中叶(NML)。我们在154 MHz的Murchison Widefield Array观测和我们在2.3 GHz的Parkes射电望远镜观测显示了连接NIL和NML的弥散无线电发射,与之前在1.4 GHz的澳大利亚望远镜紧凑阵列观测一致。这些无线电数据与我们的宽场光发射线图像的比较显示了NML无线电发射和从NIL向北延伸的电离细丝之间的关系,并揭示了一个新的电离细丝向东,可能与银河风有关。我们的深光学图像显示了从中央星系延伸到中等尺度的双极外流的明确证据,尽管没有检测到与NML对应的南方射电。因此,我们对半人马座A的观测概述揭示了一些与活动星系核反馈机制有关的特征,这些特征通常被认为可能对星系演化模型产生重大影响。作为离我们最近的星系之一,半人马座A因此提供了一个独特的实验室来详细研究反馈机制。

英文摘要:

We present new radio and optical images of the nearest radio galaxy Centaurus A and its host galaxy NGC 5128. We focus our investigation on the northern transition region, where energy is transported from the ~5 kpc (~5 arcmin) scales of the Northern Inner Lobe (NIL) to the ~30 kpc (~30 arcmin) scales of the Northern Middle Lobe (NML). Our Murchison Widefield Array observations at 154 MHz and our Parkes radio telescope observations at 2.3 GHz show diffuse radio emission connecting the NIL to the NML, in agreement with previous Australia Telescope Compact Array observations at 1.4 GHz. Comparison of these radio data with our widefield optical emission line images show the relationship between the NML radio emission and the ionised filaments that extend north from the NIL, and reveal a new ionised filament to the east, possibly associated with a galactic wind. Our deep optical images show clear evidence for a bipolar outflow from the central galaxy extending to intermediate scales, despite the non-detection of a southern radio counterpart to the NML. Thus, our observational overview of Centaurus A reveals a number of features proposed to be associated with AGN feedback mechanisms, often cited as likely to have significant effects in galaxy evolution models. As one of the closest galaxies to us, Centaurus A therefore provides a unique laboratory to examine feedback mechanisms in detail.

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