Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..866w&link_type=abstract
Astrophysical Journal, Vol.245, P. 866, 1981
Astronomy and Astrophysics
Astrophysics
7
Scientific paper
In order to determine whether radiative transfer effects in H2CO limit the usefulness of corrections to carbon isotope ratios and H2 densities which do not take such effects into account, observations of the 212 → 111 line (at 140.8 GHz) toward 12 giant molecular clouds have been made. These clouds were observed in the 110 ← 111 and 211 ← 212 absorption lines by Henkel et al., and cloud parameters were obtained from these data. The shapes of the 212 → 111 emission and 110 ← 111 absorption lines are markedly different for 10 of the 11 clouds. The differences between the emission and absorption lines are probably caused by self-absorption in the 212 → 111 lines in most cases. The discrepant line shapes imply a significant amount of clumping in these clouds. New H2CO interferometer results (Forster et al.) directly show such clumping. The model cloud parameters obtained from absorption line data are probably qualitatively correct averages for the clouds in question.
Jaffe David
Wilson Thomas L.
No associations
LandOfFree
Observation of the 2:12-1:11 Line of H2CO does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Observation of the 2:12-1:11 Line of H2CO, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observation of the 2:12-1:11 Line of H2CO will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1440980