Decomposition of the Superwind in M 82
Decomposition of the Superwind in M 82
复制标题
M 82 中的超级风分解
DOI：
10.1093/pasj/54.6.891
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发表时间：
2002
影响因子：
2.3
通讯作者：
R. Asai
中科院分区：
文献类型：
--
作者：
Y. Ohyama;Y. Taniguchi;M. Iye;Michitoshi Yoshida;K. Sekiguchi;T. Takata;Y. Saito;K. Kawabata;N. Kashikawa;K. Aoki;T. Sasaki;G. Kosugi;K. Okita;Y. Shimizu;M. Inata;Noboru Ozawa;Yasushi Yadomaru;H. Taguchi;R. Asai
我们用8.2米斯巴鲁望远镜获得了典型的星暴/超级风星系M 82的新的光学图像（B，V，和Hα），以揭示超级风驱动星云和高纬度暗带的新的详细结构。发射线星云被分解为：（1）一个脊状成分，由大量的丝状/环状子结构组成，其整体形态看起来像一对狭窄的圆柱体;（2）一个扩散成分，从核心延伸到更宽的张角。我们认为，这两个组件有不同的起源。脊占主导地位的组件出现作为一对圆柱体，而不是一对圆锥体。由于这种形态学性质与软X射线探测的热等离子体相似，因此该成分似乎包围着热等离子体。另一方面，漫射成分可能来自于尘埃颗粒，这些尘埃颗粒散射了来自星系的恒星光。由于这个成分的内部区域被认为是突出的“X”形的黑暗车道流出的核区域，他们可以被再现为尘埃颗粒的圆锥形分布，似乎有一个尘埃冷流出，以及热的软X射线和冲击激发的光发射线探测。如果是这样的话，这种高纬度尘埃颗粒的存在意味着中性气体物质也在超级风活动过程中被吹出。
We present new optical images (B, V ,a nd Hα) of the archetypical starburst/superwind galaxy M 82 obtained with the 8.2m Subaru Telescope to reveal new detailed structures of the superwind-driven nebula and the highlatitude dark lanes. The emission-line nebula is decomposed into (1) a ridge-dominated component comprising numerous filament/loop sub-structures whose overall morphology appears as a pair of narrow cylinders, and (2) a diffuse component extended over much wider opening angle from the nucleus. We suggest that these two components have different origins. The ridge-dominated component appears as a pair of cylinders rather than a pair of cones. Since this morphological property is similar to that of hot plasma probed by soft X-ray, this component seems to surround the hot plasma. On the other hand, the diffuse component may arise from dust grains which scatter stellar light from the galaxy. Since inner region of this component is seen over the prominent “X”-shaped dark lanes streaming out from the nuclear region and they can be reproduced as a conical distribution of dust grains, there seems to be a dusty cold outflow as well as the hot one probed by soft X-ray and shock-excited optical emission lines. If this is the case, the presence of such high-latitude dust grains implies that neutral gaseous matter is also blown out during the course of the superwind activity.