Detection of Eight Molecular Supershells in the Southern Milky Way with NANTEN

Details Detection of Eight Molecular Supershells in the Southern Milky Way with NANTEN Detection of Eight Molecular Supershells in the Southern Milky Way with NANTEN

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53.1003m&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.53, No. 6, pp. 1003-1016

Astronomy and Astrophysics

Astronomy

31

Galaxy: Structure, Ism: Clouds, Ism: Molecules, Ism: Supernova Remnants

Scientific paper

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 HI and low-resolution CO surveys. The size of the supershells ranges from 100 pc to 450 pc and the average is 230 pc; their age ranges from 2.2 × 106yr to 1.1 × 107 yr. We note that two of the supershells are also associated with observable indications of supershells at other wavelengths, including HI, 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.

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