A Water Maser and Ammonia Survey of GLIMPSE Extended Green Objects (EGOs)
C.J. Cyganowski, J. Koda, E. Rosolowsky, S. Towers, J. Donovan Meyer,, F. Egusa, R. Momose, T. P. Robitaille

TL;DR
This study surveys 94 massive young stellar objects using water maser and ammonia lines, revealing correlations between maser activity, ammonia emission, and methanol maser associations, supporting their youth and energetic processes.
Contribution
It provides the first comprehensive water maser and ammonia survey of all northern EGOs, analyzing their properties and associations with methanol masers to understand their evolutionary stages.
Findings
High detection rates of ammonia and water masers in EGOs.
EGOs with methanol masers show higher ammonia linewidths and temperatures.
No significant correlation between water maser luminosity and clump density.
Abstract
We present the results of a Nobeyama 45-m water maser and ammonia survey of all 94 northern GLIMPSE Extended Green Objects (EGOs), a sample of massive young stellar objects (MYSOs) identified based on their extended 4.5 micron emission. We observed the ammonia (1,1), (2,2), and (3,3) inversion lines, and detect emission towards 97%, 63%, and 46% of our sample, respectively (median rms ~50 mK). The water maser detection rate is 68% (median rms ~0.11 Jy). The derived water maser and clump-scale gas properties are consistent with the identification of EGOs as young MYSOs. To explore the degree of variation among EGOs, we analyze subsamples defined based on MIR properties or maser associations. Water masers and warm dense gas, as indicated by emission in the higher-excitation ammonia transitions, are most frequently detected towards EGOs also associated with both Class I and II methanol…
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