C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:42:25

2017A&A...598A..96L - Astronomy and Astrophysics, volume 598A, 96-96 (2017/2-1)

Revealing a spiral-shaped molecular cloud in our galaxy: Cloud fragmentation under rotation and gravity.


Abstract (from CDS):

The dynamical processes that control star formation in molecular clouds are not well understood, and in particular, it is unclear if rotation plays a major role in cloud evolution. We investigate the importance of rotation in cloud evolution by studying the kinematic structure of a spiral-shaped Galactic molecular cloud G052.24+00.74. The cloud belongs to a large filament, and is stretching over ∼100pc above the Galactic disk midplane. The spiral-shaped morphology of the cloud suggests that the cloud is rotating. We have analysed the kinematic structure of the cloud, and study the fragmentation and star formation. We find that the cloud exhibits a regular velocity pattern along west-east direction - a velocity shift of ∼10km/s at a scale of ∼30pc. The kinematic structure of the cloud can be reasonably explained by a model that assumes rotational support. Similarly to our Galaxy, the cloud rotates with a prograde motion. We use the formalism of Toomre (1964) to study the cloud's stability, and find that it is unstable and should fragment. The separation of clumps can be consistently reproduced assuming gravitational instability, suggesting that fragmentation is determined by the interplay between rotation and gravity. Star formation occurs in massive, gravitational bound clumps. Our analysis provides a first example in which the fragmentation of a cloud is regulated by the interplay between rotation and gravity.

Abstract Copyright: © ESO, 2017

Journal keyword(s): ISM: clouds - ISM: bubbles - ISM: kinematics and dynamics - stars: formation - galaxies: star formation - galaxies: star clusters: individual: G052.24+00.74

CDS comments: Table B.1 Clumps not in SIMBAD.

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NGC 4526 GiG 12 34 03.029 +07 41 56.90   10.6       ~ 600 1
2 GRSMC 51.69+0.74 MoC 19 23.9 +16 59           ~ 2 0
3 GRSMC 52.24+0.74 MoC 19 25.0 +17 28           ~ 2 0
4 [BAB2012] G52L HII 19 25.3 +17 09           ~ 5 0

    Equat.    Gal    SGal    Ecl

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