Discovery of Molecular Gas in the Outflow and Tidal Arms around M82
Discovery of Molecular Gas in the Outflow and Tidal Arms around M82
复制标题
在 M82 周围的流出物和潮汐臂中发现分子气体
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
M. Yun
中科院分区：
文献类型：
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作者：
C. Taylor;F. Walter;M. Yun
我们展示了 M82 覆盖整个星系的第一个完全采样的 12CO (1-0) 发射图。我们的地图包含约 12 × 15 kpc2 区域。我们发现，之前报道过的银河平面上方短距离处的面外 CO 排放，延伸至盘上方高达 6 kpc 的高度。其中一些发射与 H I 中看到的潮汐臂有关，这意味着 M82 的外盘中含有大量的分子气体，或者是在潮汐特征之后形成的分子气体。沿流出方向的 CO 排放延伸至圆盘上方和下方约 3 kpc 的距离。在这个距离上，该线以约 100 km s-1 的速度移动，并且与中央星暴的银河流出具有相同的意义。这意味着分子气体可能被夹带到流出物中。
We present the first fully sampled map of 12CO (1-0) emission from M82 covering the entire galaxy. Our map contains an ~12 × 15 kpc2 area. We find that extraplanar CO emission, previously reported at short distances above the galactic plane, extends to heights of up to 6 kpc above the disk. Some of this emission is associated with tidal arms seen in H I, implying either that M82 contained substantial amounts of molecular gas in the outer disk or that molecular gas formed after the tidal features. CO emission along the direction of the outflow extends to distances of ~3 kpc above and below the disk. At this distance, the line is shifted in velocity ~100 km s-1 and has the same sense as the galactic outflow from the central starburst. This implies that molecular gas may be entrained into the outflow.