SIMBAD references

2000ApJ...539L.137H - Astrophys. J., 539, L137-L141 (2000/August-3)

Extended [C i] and 13CO (5⟶4) emission in M17SW.

HOWE J.E., ASHBY M.L.N., BERGIN E.A., CHIN G., ERICKSON N.R., GOLDSMITH P.F., HARWIT M., HOLLENBACH D.J., KAUFMAN M.J., KLEINER S.C., KOCH D.G., NEUFELD D.A., PATTEN B.M., PLUME R., SCHIEDER R., SNELL R.L., STAUFFER J.R., TOLLS V., WANG Z., WINNEWISSER G., ZHANG Y.F. and MELNICK G.J.

Abstract (from CDS):

We mapped a 13x22 pc region in emission from 492 GHz [C I] and, for the first time, 551 GHz 13CO (5⟶4) in the giant molecular cloud M17SW. The morphologies of the [C I] and 13CO emission are strikingly similar. The extent and intensity of the [C I] and 13CO (5⟶4) emission is explained as arising from photodissociation regions on the surfaces of embedded molecular clumps. Modeling of the 13CO (5⟶4) emission in comparison to 13CO (1⟶0) indicates a temperature gradient across the cloud, peaking to at least 63 K near the M17 ionization front and decreasing to at least 20 K at the western edge of the cloud. We see no correlation between gas density and column density. The beam-averaged column density of C I in the core is 1x1018 cm–2, and the mean column density ratio N(C I)/N(CO) is about 0.4. The variations of N(C I)/N(CO) with position in M17SW indicate a similar clump size distribution throughout the cloud.

Abstract Copyright:

Journal keyword(s): ISM: Individual: Alphanumeric: M17SW - ISM: Molecules - ISM: Structure - Radio Lines: ISM - Submillimeter

Simbad objects: 11

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2019.10.20-04:24:42

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