Two populations of diffuse molecular clouds

Details Two populations of diffuse molecular clouds Two populations of diffuse molecular clouds

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326l..69l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 326, March 15, 1988, p. L69-L73.

Other

37

Carbon Monoxide, Chemical Composition, Interstellar Chemistry, Molecular Clouds, Abundance, Hydrogen, Interstellar Extinction

Scientific paper

The authors observed 16 diffuse clouds and eight high-latitude molecular clouds in the J = 2-1 transition of CO and 13CO and compared their properties. Results suggest that the diffuse clouds are not a homogeneous population of molecular clouds but can be divided into two groups depending on the column density of CO. One group consists of "CO-poor" clouds with N(CO) < 4×1014cm-2 and N(CO)/N(H) < 10-6. The other consists of "CO-rich" clouds with mean N(CO) = 4.2×1016cm-2 and N(CO)/N(H) ≈ 1.7×10-5. The high-latitude clouds resemble the CO-rich diffuse clouds.

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