Are the NGC 7538 formaldehyde masers really unusual?

Details Are the NGC 7538 formaldehyde masers really unusual? Are the NGC 7538 formaldehyde masers really unusual?

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387..241p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 1, 1992, p. 241-247. Research supported by University of Illinoi

Astronomy and Astrophysics

Astrophysics

15

Formaldehyde, Interstellar Masers, Molecular Clouds, Astronomical Models, Electron Transitions, Interstellar Matter, Molecular Ions

Scientific paper

The molecular cloud around NGC 7358 IRS 1 is studied in order to understand the excitation conditions for the unusual H2CO masers. Maps in the J = 1-0 transition of (C-13)O indicate densities with a lower bound of about 2000/cu cm or more in the cloud around the H II region. The results from the study of various molecular transitions indicate that the conditions required by the Boland and de Jong model for the excitation of the H2CO maser are not very stringent or unique. The maser can be excited by a compact H II region which is optically thin at millimeter wavelengths. The H2 density in the region should be about 10,000/cu cm and the masing gas should be between 0.011 and 0.017 pc from the center of the H II region to produce the observed brightness temperature for the maser.

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