High-Resolution C/17/O Observations of M17SW - Part Three - Analysis of Density and Velocity Structure

Details High-Resolution C/17/O Observations of M17SW - Part Three - Analysis of Density and Velocity Structure High-Resolution C/17/O Observations of M17SW - Part Three - Analysis of Density and Velocity Structure

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..972h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 266, NO. 4/FEB15, P. 972, 1994

Astronomy and Astrophysics

Astronomy

13

Ism: Clouds - Ism: Individual: M17Sw - Ism: Molecules - Radio Lines: Ism

Scientific paper

In an earlier paper, we presented an analysis of the small-scale structure of the M175W molecular cloud based on observations of the optically thick HCO+ and HCN J = 3→2 transitions. In this paper we present observations of the C17O J=3→2 transition. This transition is optically thin, is observed with a slightly smaller beam, and suffers less from confusion by cool gas; as a result it should be a better tracer of the kinematics of the warm molecular gas in the region. We analyse the structure using the same techniques as in Paper I, and find that our earlier results are confirmed by these new data. In particular, we identify 35 individual clumps, with masses ranging from 10-1000 Msun. The clump mass spectrum has a slope of -1.9±0.2, which is identical to our earlier value. Autocorrelation and structure function analysis of the velocity centroid map confirms the presence of small-scale, nearly isotropic motion with a characteristic scale of ≍0.2 pc; the variation with scale of the turbulent pressure and energy dissipation rate are similar to those derived for the HCO+ and HCN data. The Gaussian-clump decomposition is broadly similar to that for C18O J=2→1 by Stutzki & Güsten, within the area common to both maps, but differs greatly from that for HCO+ and HCN. Thus, although clump fitting is a useful formal description of structure, it is only an approximate description of real (non-Gaussian) molecular cloud components.

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