H2CO and H I observations of dark clouds in NGC 2264

Details H2CO and H I observations of dark clouds in NGC 2264 H2CO and H I observations of dark clouds in NGC 2264

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....38...81m&link_type=abstract

Astronomy and Astrophysics, vol. 38, no. 1, Jan. 1975, p. 81-85.

Physics

9

Cosmic Dust, Formaldehyde, H Lines, Interstellar Gas, Nebulae, Star Clusters, Cloud Physics, Hydrogen Ions, Hydroxyl Compounds, Line Spectra, Microwave Emission, Molecular Spectra, Spectral Energy Distribution, Spectral Line Width

Scientific paper

The 6-cm H2CO and 21-cm H I lines are surveyed at the positions of dark clouds in NGC 2264 to compare the line parameters among different molecules, to examine the kinematic behavior of H2CO and OH molecular clouds in the region, and to observe sharp depressions in the H I lines. The H2CO and OH line intensities are found to be generally correlated but not strictly proportional, while the ratio H2CO/OH is found to be larger than previous estimates. The H2CO line widths in some areas are observed to be about 3 km/s, and a velocity difference of more than 3 km/s between the H2CO and OH lines is measured at two positions, suggesting that clouds of these molecules do not coexist at these positions. A good correlation is found between the velocities of a sharp depression in the H I line profiles and the H2CO lines.

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