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A review of H2CO 6cm masers in the Galaxy

Published online by Cambridge University Press:  01 March 2007

E. Araya ,
P. Hofner  and
W. M. Goss
E. Araya
Affiliation:
National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801, USA New Mexico Institute of Mining and Technology, Physics Department, 801 Leroy Place, Socorro, NM 87801, USA email: earaya@nrao.edu
P. Hofner
Affiliation:
National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801, USA New Mexico Institute of Mining and Technology, Physics Department, 801 Leroy Place, Socorro, NM 87801, USA email: earaya@nrao.edu
W. M. Goss
Affiliation:
New Mexico Institute of Mining and Technology, Physics Department, 801 Leroy Place, Socorro, NM 87801, USA email: earaya@nrao.edu
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Abstract

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We present a review of the field of formaldehyde (H2CO) 6cm masers in the Galaxy. Previous to our ongoing work, H2CO 6cm masers had been detected in the Galaxy only toward three regions: NGC7538 IRS1, Sgr B2, and G29.96–0.02. Current efforts by our group using the Very Large Array, Arecibo, and the Green Bank Telescope have resulted in the detection of four new H2CO 6cm maser regions. We discuss the characteristics of the known H2CO masers and the association of H2CO 6cm masers with very young regions of massive star formation. We also review the current ideas on the pumping mechanism for H2CO 6cm masers.

Keywords

masersstars: formationISM: moleculesHII regionsradio lines: ISM

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