Detection of an isotopic short submillimeter CO line - Column densities of warm gas in molecular clouds

Details Detection of an isotopic short submillimeter CO line - Column densities of warm gas in molecular clouds Detection of an isotopic short submillimeter CO line - Column densities of warm gas in molecular clouds

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358l..49g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. L49-L52.

Astronomy and Astrophysics

Astrophysics

54

Carbon Monoxide, Interstellar Chemistry, Interstellar Gas, Millimeter Waves, Molecular Clouds, Carbon 13, Density (Mass/Volume), H Ii Regions, Line Spectra, Orion Nebula

Scientific paper

The first astronomical detection of isotopic (C-13)O J = 6 - 5 emission at 661 GHz from the molecular clouds in Orion A and in NGC 2024 is reported. Strong lines indicate large column densities of warm, dense, molecular gas in these star formation regions. It is estimated that H2 column densities of gas with temperature of 100 K or more lie between 3 x 10 to the 22nd and 4 x 10 to the 23rd/sq cm. These column densities are difficult to explain by present theoretical heating models. In NGC 2024 and the Orion Bar, where lines are narrow, shock heating is very unlikely. The correlation of warm CO column density with UV intensity, also indicated by the nondetection of (C-13)O J = 6 - 5 emission toward the weak UV source NGC 2023, favors heating by UV radiation. However, present photodissociation region models fail to predict the large quantities of warm gas detected in NGC 2024 and in the Orion Bar.

Affiliated with

Also associated with

No associations

Rating

Detection of an isotopic short submillimeter CO line - Column densities of warm gas in molecular clouds 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 Detection of an isotopic short submillimeter CO line - Column densities of warm gas in molecular clouds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of an isotopic short submillimeter CO line - Column densities of warm gas in molecular clouds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1125131