Formaldehyde emission from DR21 /OH/

Details Formaldehyde emission from DR21 /OH/ Formaldehyde emission from DR21 /OH/

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107l..10w&link_type=abstract

Astronomy and Astrophysics, vol. 107, no. 1, Mar. 1982, p. L10-L12.

Astronomy and Astrophysics

Astrophysics

14

Astronomical Spectroscopy, Formaldehyde, Interstellar Masers, Molecular Spectra, K Lines, Stellar Evolution

Scientific paper

The discovery of H2CO emission from the 2(11)-2(12) K-doublet line at 14.5 GHz is reported. The emission is centered at alpha equals 20 h 37 m 13.8 s, delta equals +42 deg 11 arcmin 55 arcsec (1950.0), which is within 15 arcsec of the position of the OH and H2O emission source DR21(OH). The extent of the line emitting source is not greater than about 30 arcsec. From excitation considerations, it is believed that this emission has a quasi-thermal origin. If the region is similar to OMC-1 the size would be about 10 arcsec. Source parameters have been estimated for sizes of 30 arcsec and 10 arcsec assuming that the shape is spherical and that an H2 density of not less than one million per cu cm is required to produce H2CO emission in the 14.5 GHz line.

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