Formaldehyde absorption measurements of selected galactic molecular clouds

Details Formaldehyde absorption measurements of selected galactic molecular clouds Formaldehyde absorption measurements of selected galactic molecular clouds

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26as...49..607b&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 49, Sept. 1982, p. 607-630.

Astronomy and Astrophysics

Astrophysics

45

Astronomical Maps, Formaldehyde, Milky Way Galaxy, Molecular Absorption, Molecular Clouds, Absorption Spectra, Abundance, H Ii Regions, Radio Telescopes, Space Density, Spectral Line Width, Stellar Evolution

Scientific paper

Detailed maps of H2CO 4830 MHz absorption toward 12 bright galactic H II regions and 2 dark clouds are presented. The H II regions mapped are W3, W3(OH), NGC 2024, W31, W33, M17, W43, W49A, W51A, W51B, K3-50, and DR21/W75N; the dark clouds are NGC 2264 and Cloud 2. The maps have 2.6-arcmin angular resolution and cover the full range of velocities over which H2 CO absorption has been detected. The maps delineate molecular clouds toward low-surface-brightness regions which are inaccessible to aperture synthesis methods. H2CO column densities and cloud sizes are tabulated for each of the detected absorption features. In some cases, the H2CO data can be combined with other molecular observations to determine relative positions of the molecular clouds and the ionized gas. The mapping results indicate that large-scale systematic motions are not common, and that the observed line widths are probably a result of small-scale turbulence driven by the exciting stars of the H II regions.

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