SIMBAD references

2020ApJ...898..122X - Astrophys. J., 898, 122-122 (2020/August-1)

Rotation of two micron all sky survey clumps in molecular clouds.

XU X., LI D., DAI Y.S., GOLDSMITH P.F. and FULLER G.A.

Abstract (from CDS):

We have analyzed the rotational properties of 12 clumps using 13CO (1-0) and C18O (1-0) maps of the Five College Radio Astronomy Observatory 13.7 m radio telescope. The clumps, located within molecular clouds, have radii (R) in the range of 0.06-0.27 pc. The direction of clump elongation is not correlated with the direction of the velocity gradient. We measured the specific angular momentum (J/M) to be between 0.0022-0.025 pc km s–1 based on 13CO images, and between 0.0025-0.021 pc km s–1 based on C18O images. The consistency of J/M based on different tracers indicates the 13CO and C18O in dense clumps trace essentially the same material despite significantly different opacities. We also found that J/M increases monotonically as a function of R in power-law form, J/M∝R^1.58±0.11^. The ratio between rotation energy and gravitational energy, β, ranges from 0.0012 to 0.018. The small values of β imply that rotation alone is not sufficient to support the clump against gravitational collapse.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Interstellar medium - Interstellar dynamics - Interstellar molecules - Intercloud medium - Interstellar emissions

Simbad objects: 16

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2021.03.04-23:56:51

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