Detection of Eight Molecular Supershells in the Southern Milky Way with NANTEN
Detection of Eight Molecular Supershells in the Southern Milky Way with NANTEN
复制标题
用 NANTEN 探测南银河系中的八个分子超壳层
DOI：
10.1093/pasj/53.6.1003
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发表时间：
2001
影响因子：
2.3
通讯作者：
Y. Fukui
中科院分区：
文献类型：
--
作者：
Ken’ichi Matsunaga;N. Mizuno;Y. Moriguchi;T. Onishi;A. Mizuno;Y. Fukui
We carried out a new CO survey for molecular supershells in the southern Milky Way with NANTEN. We covered an area of 300 ◦ <l< 350 ◦ and −9 ◦ <b< 9 ◦ at 4 � or 8 � grid spacings with a 2. 6 beamsize. In addition to the disk component at |b| < 2 ◦ , we found numerous filamentary or arc-like CO distributions by inspecting the velocity channel maps. As a result, we identified 8 supershell candidates, 3 of which are associated with CO holes in the galactic disk. Six of the supershells had not been identified by the previous studies, while 2 of them were known from H I and low-resolution CO surveys. The size of the supershells ranges from 100pc to 450pc and the average is 230pc; their age ranges from 2.2 ×10 6 yr to 1.1 ×10 7 yr. We note that two of the supershells are also associated with observable indications of supershells at other wavelengths, including H I, far-infrared, soft X-ray, and SNRs. The implications of these findings are discussed in terms of the impact of supershells on star formation in the Galaxy.
