High-resolution HCO(+) and HCN observations of M17SW - Clumps, turbulence and cloud support
M. P. Hobson;
MNRAS, 1992, 256, 457
ABSTRACT:High-resolution observations of the molecular cloud core M17SW in the HCO(+) J = 3 - 2 and HCN J = 3 - 2 transitions are presented. Analysis of the
intensity distribution, using power spectrum and autocorrelation function
techniques, indicates the presence of structure in both lines, on all scales down to
the resolution limit of the telescope.
The turbulent pressure and
maximum energy dissipation rate are derived as functions of scale size, and the
relationship is markedly different from that assumed in standard turbulent cascade
models.
A Gaussian decomposition of the HCO(+) and HCN emission identifies 32
and 19 clumps, respectively.
Clump masses range from a few to a few
thousand solar masses and, for both data sets, are consistent with a power-law
mass spectrum of the form dN/dM varies as M exp -1.9.
KEYWORDS: formyl ions, hydrocyanic acid, interstellar matter, molecular clouds, molecular ions, power spectra, fourier analysis, star formation, stellar composition
PERSOKEY:turbulence, ,
CODE: hobson92