Masers and molecules near the unusual formaldehyde maser NGC 7538 IRS 1

Details Masers and molecules near the unusual formaldehyde maser NGC 7538 IRS 1 Masers and molecules near the unusual formaldehyde maser NGC 7538 IRS 1

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..832p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 832-838. Research supported by the University of Ill

Astronomy and Astrophysics

Astrophysics

21

Formaldehyde, Interstellar Masers, Line Spectra, Molecular Clouds, H Ii Regions, Hydrocyanic Acid, Microwave Interferometers

Scientific paper

Interferometric observations of the emission from three hyperfine lines of the J = 1-0 transition of HCN have been analyzed in order to characterize the physical conditions in the molecular cloud associated with NGC 7538 IRS 1 and its 6-cm H2CO maser. It is suggested that the lack of HCN emission around IRS 1 and IRS 2 could be the result of the expansion of the H-II region. The presence of high-density clumps around IRS 1 can account for the different excitation requirements for the H2CO and OH masers.

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