A Review of H2CO 6cm Masers in the Galaxy
E. Araya (1, 2), P. Hofner (1, 2), W. M. Goss (1) ((1), National Radio Astronomy Observatory, (2) New Mexico Institute of Mining and, Technology)
TL;DR
This review summarizes the discovery, characteristics, and formation mechanisms of H2CO 6cm masers in the Galaxy, highlighting recent detections and their association with young massive star-forming regions.
Contribution
It provides a comprehensive overview of known H2CO 6cm masers, reports four new detections, and discusses their pumping mechanisms and relation to star formation.
Findings
Four new H2CO 6cm maser regions detected.
H2CO masers are associated with very young massive star-forming regions.
Current models on maser pumping mechanisms are reviewed.
Abstract
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.
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