Astrophys. J., Suppl. Ser., 233, 4-4 (2017/November-0)
A catalog of 44 GHz methanol masers in massive star-forming regions. IV. The high-mass protostellar object sample.
RODRIGUEZ-GARZA C.B., KURTZ S.E., GOMEZ-RUIZ A.I., HOFNER P., ARAYA E.D. and KALENSKII S.V.
Abstract (from CDS):
We present a survey of 56 massive star-forming regions in the 44 GHz methanol maser transition made with the Karl G. Jansky Very Large Array (VLA); 24 of the 56 fields showed maser emission. The data allow us to demonstrate associations, at arcsecond precision, of the Class I maser emission with outflows, H II regions, and shocks traced by 4.5 µm emission. We find a total of 83 maser components with line widths ranging from 0.17 to 3.3 km s–1, with a nearly flat distribution and a median value of 1.1 km s–1. The relative velocities of the masers with respect to the systemic velocity of the host clouds range from -2.5 to 3.1 km s–1, with a distribution peaking near zero. We also study the correlation between the masers and the so-called extended green objects (EGOs) from the GLIMPSE survey. Multiple sources in each field are revealed from IR images as well as from centimeter continuum emission from VLA archival data; in the majority of cases the 44 GHz masers are positionally correlated with EGOs, which seem to trace the younger sources in the fields. We report a possible instance of a 44 GHz maser associated with a low-mass protostar. If confirmed, this region will be the fifth known star-forming region that hosts Class I masers associated with low-mass protostars. We discuss three plausible cases of maser variability.
© 2017. The American Astronomical Society. All rights reserved.
masers - ISM: molecules - stars: formation - stars: massive - stars: protostars - stars: protostars
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