High-density molecular gas in external galaxies - Formaldehyde and carbon monosulfide

Details High-density molecular gas in external galaxies - Formaldehyde and carbon monosulfide High-density molecular gas in external galaxies - Formaldehyde and carbon monosulfide

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..132b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 10, 1990, p. 132-139.

Astronomy and Astrophysics

Astrophysics

30

Carbon Disulfide, Formaldehyde, Interstellar Matter, Irregular Galaxies, Molecular Gases, Absorption Spectra, Electron Transitions, Interstellar Gas, Molecular Spectra, Radiative Transfer

Scientific paper

Observations in the 2(11)-2(12) transition of orthoformaldehyde were made to search for high-density gas in extragalactic sources. The line was detected in absorption toward NGC 253 and in emission toward M82, the first detection of 2 cm emission outside the Galaxy. A comparison of the 2 and 6 cm lines from Cen A indicates densities of the order of 100,000/cu cm. Comparison of the 2 and 6 cm lines from NGC 253 suggests that the central part of the 6 cm profile consists of a superposition of a broad absorption line and a narrower emission component. The emission probably originates in foreground formaldehyde gas pumped by the nonthermal radio continuum from the nucleus. In M82, a high angular resolution CS map shows two spatially unresolved centers of emission located along the major axis of the galaxy. The two emission centers are a part of the molecular torus structure also seen in CO. Extragalactic paraformaldehyde was detected for the first time.

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