Molecular Clouds with Peculiar Velocity in the Outer Local Arm

Details Molecular Clouds with Peculiar Velocity in the Outer Local Arm Molecular Clouds with Peculiar Velocity in the Outer Local Arm

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jkas...39..107k&link_type=abstract

Journal of the Korean Astronomical Society, vol. 39, no. 4, pp. 107-114

Other

Ism : Outer Galaxy, Ism : Structure, Velocity Objects : Molecular Clouds

Scientific paper

We conducted an analysis of a selected region from the FCRAO \coOuter Galaxy Survey. The selected region is located between galactic longitude 117° and 124° with the velocity of -23 kms < V_{LSR} < -10 kms. Molecular clouds in this region show a peculiar velocity field, protruding from the Local Arm population. The selected region is divided into 7 clouds by spatial location. Though we were not able to identify the direct driving source for peculiar velocity of our target region, we find that there are several internal YSOs or star forming activities; there are many associated sources like an outflows, a high-mass protostellar candidate and H_{2}O maser sources. We attribute the driving energy source to older generation of episodic star formation. Masses of main clouds (cloud 1 - 4) estimated using a conversion factor from \columinosity are larger than 10^{4} M_{&sun;}. Other components have a small mass as about 10^{3} M_{&odot}.; Among main clouds, cloud 2 and 4 seem to be marginally gravitational bound systems as their ratio of M_{CO} to M_{VIR} is about 2˜3, and the internal velocity dispersion is larger than the centroid velocity dispersion. Total mass estimated using a conversion factor from \columinosity is 7.9 × 10^{4} M_{&sun;}.

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