Isotopic CO observations of M 17(SW)

Details Isotopic CO observations of M 17(SW) Isotopic CO observations of M 17(SW)

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..731g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 731-739.

Astronomy and Astrophysics

Astrophysics

13

Abundance, Carbon Isotopes, Molecular Clouds, Oxygen Isotopes, Star Formation, H Ii Regions, Local Thermodynamic Equilibrium, Spatial Resolution, Ultraviolet Radiation

Scientific paper

CO, (C-13)O and C(O-18) J = 3-2 and CS J = 7-6 observations have been made of a region of the M 17(SW) molecular cloud. An area about 2 sq pc in size, lying adjacent to the well-known ionization front, has been mapped with high spatial resolution (0.15 pc). Emission components at 1sr velocities of about 14, 21, and 26 km/s are present, and clumping scales of greater than 1 pc, about 0.5 pc and less than 0.15 pc have been identified. In addition, a bright-rimmed clump about 0.8 pc across has been observed, the outer layer of which is thought to be heated by UV radiation penetrating between small cloud fragments. Results from a simple LTE model indicate that pressure from the hotter, denser surface layers may cause the clump to collapse.

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