Formaldehyde emission in galaxies

Details Formaldehyde emission in galaxies Formaldehyde emission in galaxies

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415..140b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 415, no. 1, p. 140-149.

Astronomy and Astrophysics

Astrophysics

27

Emission Spectra, Formaldehyde, Galactic Radiation, Interstellar Masers, Extragalactic Radio Sources, Hydroxyl Emission, Interstellar Matter

Scientific paper

Nine detections of extragalactic emission in the 4.83 GHz 1(10)-1(11) formaldehyde transition are presented in addition to the only previously known extragalactic emission source in IC 4553. Formaldehyde emission occurs among both OH absorbers and emitters. In contrast with the high-detection rate of extragalactic sources in this survey, there are only a small number of Galactic sources with 4.83 GHz emission. Formaldehyde absorption was found in one new source. A comparison was made between the H2CO and OH properties of the galaxies. In analogy with the OH megamasers and as proposed for the IC 4553 formaldehyde megamaser emission line, low-gain amplification of radio continuum by foreground clouds in a molecular disk is also suggested for the new formaldehyde megamasers.

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