Formaldehyde in the rho Ophiuchi dark cloud

Details Formaldehyde in the rho Ophiuchi dark cloud Formaldehyde in the rho Ophiuchi dark cloud

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202l..25m&link_type=abstract

Astrophysical Journal, vol. 202, Nov. 15, 1975, pt. 2, p. L25-L30.

Astronomy and Astrophysics

Astronomy

30

Formaldehyde, Interstellar Radiation, Microwave Spectra, Nebulae, Radio Astronomy, Gravitational Collapse, Infrared Astronomy, Milky Way Galaxy, Molecular Spectra

Scientific paper

The 6-cm transition of H2CO was mapped in absorption over a region 1 deg by 1 deg with 6 min resolution toward the rho Oph dark cloud. The distribution of H2CO column density agrees well with the extinction due to dust. At least three regions of high H2CO concentration can be identified. Two regions of reduced H2CO column density coincide with regions of carbon recombination-line emission, reflection nebulosity, and concentration of infrared sources. The most likely mechanisms of line intensity reduction are increased excitation temperature, due to electron collisions, and reduced column density, due to destructive (c+) collisions. Both effects are associated with the observed C II region(s). A north-south velocity gradient of about 0.5 km/sec/pc is observed, which is probably not sufficient to stabilize the cloud against large-scale gravitational collapse.

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