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| Paper: |
The Dynamical State of Filementary Infrared Dark Cloud, Serpens South |
| Volume: |
476, New Trends in Radio Astronomy in the ALMA Era |
| Page: |
363 |
| Authors: |
Tanaka, T.; Awazu, Y.; Nakamura, F.; Sugitani, K.; Shimajiri, Y.; Kawabe, R.; Ohnishi, T.; Yoshida, H. |
| Abstract: |
We present the results of N2H+ (J=1-0) observations toward
the nearest filamentary infrared dark cloud, Serpens South, using the
NRO 45m telescope. From the N2H+ data, we derive the spatial
distributions of the physical quantities such as the velocity width.
Using the dust continuum map, we divide the cloud
into several clumps with sub-pc radii. The masses of the clumps are
estimated to be 40 – 200 ☉.
Applying the virial analysis, we found
that the virial ratios of the clumps are as small as a ≈ 0.2, indicating
that the internal motions play only a minor role in
the clump support.
However, the clumps do not exhibit any signs of the free-fall collapse.
The clumps may be supported against gravity,
presumably by the globally-ordered magnetic field recently discovered
by Sugitani and his collaborators. |
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