High-resolution maps of 6 centimeter formaldehyde - Clumping in molecular clouds

Details High-resolution maps of 6 centimeter formaldehyde - Clumping in molecular clouds High-resolution maps of 6 centimeter formaldehyde - Clumping in molecular clouds

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..386m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 1, 1985, p. 386-404.

Astronomy and Astrophysics

Astronomy

24

Astronomical Maps, Formaldehyde, Hydrogen Clouds, Interstellar Gas, Molecular Clouds, Radio Astronomy, Carbon Monoxide, Centimeter Waves, Continuous Spectra, High Resolution, Line Spectra, Optical Thickness, Spectral Line Width

Scientific paper

VLA maps of W31, W33, W49, and W51 in the 110-111 line of ortho-H2CO are presented. The maps were made with angular resolution of 10arcsec - 15arcsec and a velocity resolution of 1.8 km s-1. In all of the regions measured, the ortho-H2CO distribution breaks up into a number of condensations, or clumps. Averaged over all of the sources, the median clump size is 0.5 pc with a range from <0.2 pc to >1.4 pc. The median apparent optical depth is 0.4 with a range from <0.1 to 1.1. The median line width (FWHP) is 5.0 km s-1, with a range from <1 km s-1 to 13 km s-1. Based on line width, the clumps can be placed in two categories: those having FWHP widths ≤1 km s-1 and those having widths larger than 3 km s-1. The first group could follow the relation given by Larson in 1981 and might have masses which agree with virial estimates. For the second group, the clumps have ≡10% of the sizes predicted from the line widths, and the masses of most of these clumps toward W31 and W51 are 20% - 60% of the virial mass estimates.

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