Large-scale distributions of mid- and far-infrared emission from the center to the halo of M 82 revealed with AKARI
Large-scale distributions of mid- and far-infrared emission from the center to the halo of M 82 revealed with AKARI
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DOI：
10.1051/0004-6361/200913769
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发表时间：
2010-02
影响因子：
6.5
通讯作者：
H. Kaneda;D. Ishihara;T.Suzuki;N. Ikeda;T. Onaka;M. Yamagishi;Y. Ohyama;T. Wada;A. Yasuda
中科院分区：
文献类型：
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作者：
H. Kaneda;D. Ishihara;T.Suzuki;N. Ikeda;T. Onaka;M. Yamagishi;Y. Ohyama;T. Wada;A. Yasuda
上下文边缘星暴星系M82在其晕中呈现出复杂的气态物质分布，包括由核星暴驱动的电离超级风、由超级风携带的中性物质以及可能由过去与M81的潮汐相互作用引起的大尺度中性流光。目标。我们调查的尘埃颗粒和多环芳烃（PAHs）周围的详细分布M82了解它们与气体成分的相互作用。方法.我们用AKARI上的红外照相机（IRC）和远红外探测器（FIS）对M 82进行了中红外和远红外观测。结果我们获得了M82的新的MIR和FIR图像，它们分别揭示了晕中微弱的扩展发射和中心非常明亮的发射，信号动态范围分别为MIR的5个数量级和FIR的3个数量级。我们在远离星系盘的区域探测到了MIR和FIR辐射，反映了M82晕中的尘埃和多环芳烃。结论.我们发现，尘埃和多环芳烃都包含在电离和中性气体成分，这意味着他们已经被驱逐到晕的M82恒星爆发和星系的相互作用。特别是，我们得到了PAH和Hα发射之间的紧密相关，这提供了证据，表明PAH在电离的超风气体中很好地混合并从盘中流出。
Context. The edge-on starburst galaxy M 82 exhibits complicated distributions of gaseous materials in its halo, which include ionized superwinds driven by nuclear starbursts, neutral materials entrained by the superwinds, and large-scale neutral streamers probably caused by a past tidal interaction with M 81. Aims. We investigate detailed distributions of dust grains and polycyclic aromatic hydrocarbons (PAHs) around M 82 to understand their interplay with the gaseous components. Methods. We performed mid- (MIR) and far-infrared (FIR) observations of M 82 with the infrared camera (IRC) and far-infrared surveyor (FIS) onboard AKARI. Results. We obtained new MIR and FIR images of M 82, which reveal both faint extended emission in the halo and very bright emission in the center with signal dynamic ranges as broad as five orders of magnitude for the MIR and three for FIR, respectively. We detected MIR and FIR emission in the regions far away from the disk of the galaxy, reflecting the dust and PAHs in the halo of M 82. Conclusions. We find that the dust and PAHs are contained in both ionized and neutral gas components, implying that they have been expelled into the halo of M 82 by both starbursts and galaxy interaction. In particular, we obtain a tight correlation between the PAH and Hα emission, which provides evidence that the PAHs are well mixed in the ionized superwind gas and flowing out from the disk.