Atomic carbon in the high-latitude molecular cloud MBM 12

Details Atomic carbon in the high-latitude molecular cloud MBM 12 Atomic carbon in the high-latitude molecular cloud MBM 12

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...431l.139i&link_type=abstract

The Astrophysical Journal (ISSN 0004-637X), vol. 431, no. 2, pt. 2, p. L139-L142

Astronomy and Astrophysics

Astrophysics

18

Chemical Fractionation, Interstellar Radiation, Molecular Clouds, Photodissociation, Atmospheric Density, Brown Dwarf Stars, Latitude

Scientific paper

We report the first detection of neutral atomic carbon emission from a high-latitude cloud. (C I) 492 GHz emission was detected from seven (13)CO cores in MBM 12, the nearest known molecular cloud (d = 65 pc; b = -34 deg). There is strong evidence that the lines of (C I) and CO are formed in the same regions of the cloud. The average C/CO column density ratio is approximately 0.7, which is a factor of approximately 1.4-7 times higher than the same value measured toward dense Galactic photodissociation regions. Recent chemical models of translucent clouds with IUV = 1 Habing field can account for this ratio. Due to the proximity of MBM 12, we have discovered evidence for density clumps with sizes less than or approximately 2000 AU. The clumps contain H2 masses of order the mass of Jupiter.

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