The H2CO absorption toward IC 1318 b-c in Cygnus

Details The H2CO absorption toward IC 1318 b-c in Cygnus The H2CO absorption toward IC 1318 b-c in Cygnus

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..133d&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 133-135, 137-141.

Astronomy and Astrophysics

Astronomy

17

Astronomical Spectroscopy, Formaldehyde, Interstellar Matter, Molecular Spectra, Absorption Spectra, Cosmic Dust, H Alpha Line, H Ii Regions, Nebulae, Radial Velocity, Radio Astronomy

Scientific paper

Formaldehyde absorption at 6 cm has been mapped in the prominent dust lane which separates the optical nebulae IC 1318 b and c. The apparent optical depths of H2CO range between 0.2 and 0.8 within the dust lane and at most about 0.1 where the visual absorption falls below about 4 to 4.5 mag. However, there is not a detailed correlation between the observed H2CO absorption and the dust. In the region of highest visual extinction, the 6 cm absorption is reduced, but here 2 mm emission from more highly excited levels of H2CO is observed instead. It is concluded that the H II regions are physically associated with the dust and molecules. The (LSR) radial velocities of the H2CO absorption are similar to those of the H alpha emission with the most negative values in the regions of least obscuration, which suggests that the H II regions may be expanding into the molecular cloud.

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