Formaldehyde Observations Towards Methanol Maser Sources. ABSTRACT Observational works on 4.83 GHz Formaldehyde (H2CO) absorptions and 4.87 GHz H110α radio recombination lines towards 6.7 GHz Methanol (CH3OH) maser sources are presented. Methanol masers provide ideal sites to probe the earliest stages of massive star formation, while 4.8 GHz Formaldehyde absorptions are accurate probes of physical […]

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