Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.2256v&link_type=abstract
Astronomical Journal v.110, p.2256
Astronomy and Astrophysics
Astronomy
12
Ism: Clouds, Ism: Individual: Iras 2306+1451, Ism: Kinematics And Dynamics
Scientific paper
I analyze the observed line wing data of the J=2-1 12CO and 13CO lines toward the extended cool cirrus object IRAS 2306+1451, relevant to high-velocity gas (going away from two main clouds). Here I find evidence of a collision between a cloud slightly north of the IRAS object with a similar cloud south of the IRAS object. The two main molecular clouds, with masses ≍7 and 10 Msun and sizes near 0.3 pc, collided near ≍150 pc from the Sun toward galactic longitude 89° and latitude -41°. In this cloud-cloud collision model, the bottom of the northern cloud, going away from Sun and to the south, met the top of the southern cloud coming toward the Sun and to the north. At the impact, there is a cool clump of coalesced gas with mass ≍1 Msun and size ≍0.1 pc across. This clump is not likely to collapse to form a star; it will likely disperse later. The Kitt Peak observations show two small high-velocity gas clouds. Each of the two moving cloudlets has an accumulated mass ≍0.2 Msun and a density decreasing with distance from the impact site. The cloud-cloud collision theory provides an interpretation in the form of two broad "escaping cloudlets," going away from the impact site.
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