A Dark-Cloud Complex in Aquila: Small Molecular Clouds Possibly Associated with the Aquila Rift

Details A Dark-Cloud Complex in Aquila: Small Molecular Clouds Possibly Associated with the Aquila Rift A Dark-Cloud Complex in Aquila: Small Molecular Clouds Possibly Associated with the Aquila Rift

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51..851k&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.851-858.

Astronomy and Astrophysics

Astronomy

11

Galaxy: Structure, Ism: Clouds, Ism: Individual (Aquila Dark Clouds), Ism: Molecules, Stars: Formation

Scientific paper

A 12CO(J = 1-0) survey for local molecular clouds was performed toward dark clouds in Aquila (26deg < l <= 42deg and -25deg <= b < -2deg) by using the 4-meter millimeter wave telescope, NANTEN, at Las Campanas Observatory, Chile. A cloud complex consisting of 64 small clouds has been discovered in -25deg <~ b <~ -12deg; at a distance of 220 pc, its height from the galactic plane is ~ 50-100 pc and the total mass is ~ 4 x 103 MO . The spatial and velocity distributions of the complex suggest that it may be connected to the Great Rift in Aquila. This complex, as a whole, has a significantly large virial mass compared with the mass derived from the CO intensities by an order of magnitude, though H I gas of ~ 104 MO , possibly associated, may contribute to bind them gravitationally. The individual CO clouds have velocity dispersion and mass similar to those of the high-latitude clouds; also, the clouds are not in gravitational equilibrium. There is no indication of active star formation.

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