SIMBAD references

2004A&A...424..887K - Astronomy and Astrophysics, volume 424, 887-903 (2004/9-4)

Emission of CO, CI, and CII in W3Main.


Abstract (from CDS):

We used the KOSMA 3m telescope to map the core 7'x5' of the Galactic massive star forming region W3Main in the two fine structure lines of atomic carbon and four mid-J transitions of CO and 13CO. The maps are centered on the luminous infrared source IRS5 for which we obtained ISO/LWS data comprising four high-J CO transitions, [CII], and [OI] at 63 and 145µm. In combination with a KAO map of integrated line intensities of [CII] (Howe et al., 1991ApJ...373..158H), this data set allows us to study the physical structure of the molecular cloud interface regions where the occurence of carbon is believed to change from C+ to C0, and to CO. The molecular gas in W3Main is warmed by the far ultraviolet (FUV) field created by more than a dozen OB stars. Detailed modelling shows that most of the observed line intensity ratios and absolute intensities are consistent with a clumpy photon dominated region (PDR) of a few hundred unresolved clumps per 0.84pc beam, filling between 3 and 9% of the volume, with a typical clump radius of 0.025pc (2.2''), and typical mass of 0.44M. The high-excitation lines of CO stem from a 100-200K layer, as do the [CI] lines. The bulk of the gas mass is however at lower temperatures.

Abstract Copyright:

Journal keyword(s): infrared: ISM - ISM: clouds - ISM: structure - ISM: abundances - galaxies: ISM - submillimeter

Simbad objects: 34

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