Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...184..315m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 184, no. 1-2, Oct. 1987, p. 315-321.
Astronomy and Astrophysics
Astrophysics
1
Formaldehyde, Interstellar Extinction, Molecular Clouds, Ophiuchi Clouds, Correlation, Interstellar Matter, Star Distribution, Velocity Distribution
Scientific paper
We have mapped the 4.83 GHz H2CO line in the dark cloud L 1709 in the Q Oph complex and compared it with the distribution of visual extinction derived from star counts. The contours of the H2CO and the shape of the dark cloud show a remarkable similarity. The H2CO column density and visual extinction have a positive linear correlation with a slope of 0.9 × 1013. The threshold value of visual extinction from which H2CO can be detected in this cloud is Av > 0.9 mag. There is a suggestion of a turnover of the relation between the H2CO column density and Av at high Av. Although the limited amount of data does not allow us to draw any definite conclusions as to the cause, depletion on grains is a possibility. The ratios, N1 (H2CO)/Av and Nl/NH2, the volume density and the total mass of the cloud are derived. The radial velocity distribution indicates the presence of independently moving subclouds.
Greenberg Mayo J.
Minn Young Key
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