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Title:
Search for 6 Centimeter Formaldehyde Masers in 22 Galactic Star-forming Regions
Authors:
Mehringer, David M.; Goss, W. M.; Palmer, Patrick
Publication:
Astrophysical Journal v.452, p.304 (ApJ Homepage)
Publication Date:
10/1995
Origin:
APJ; KNUDSEN
Astronomy Keywords:
ISM: INDIVIDUAL NGC NUMBER: NGC 7538, ISM: MOLECULES, MASERS, RADIO LINES: ISM
DOI:
10.1086/176301
Bibliographic Code:
1995ApJ...452..304M

Abstract

A search for 6 cm H2CO (formaldehyde) masers in 22 Galactic star-forming regions has been carried out using the B configuration of the VLA. These observations have 2" angular resolution. The sensitivity ranges between 2 and 4 mJy beam-1. No new H2CO masers are detected. The paucity of these masers suggests that (1) their lifetimes are quite short, and/or (2) a narrow range of physical parameters is necessary for their formation. The known H2CO maser source NGC 7538 was also observed. The line flux of one of its two components has tripled over a 15 yr period.

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