A catalog of 44 GHz methanol masers in massive star-forming regions. IV. The high-mass protostellar object sample

Abstract

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, HII regions, and shocks traced by 4.5 micron emission. We find a total of 83 maser components with linewidths 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.

References in corpus (11)

• A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates
• A Class I and Class II Methanol Maser Survey of Extended Green Objects (EGOs) from the GLIMPSE Survey
• Spitzer IRAC and MIPS Imaging of Clusters and Outflows in 9 High-mass Star Forming Regions
• VLA observations of ammonia in high-mass star formation regions
• Weak and Compact Radio Emission in Early High-Mass Star Forming Regions: I. VLA Observations
• The high-mass star-forming region IRAS18182-1433
• Star formation in a clustered environment around the UCHII region in IRAS 20293+3952
• High Resolution Imaging of Molecular Outflows in Massive Young Stars
• MALT-45: A 7 mm survey of the southern Galaxy - I. Techniques and spectral line data
• Class I Methanol (CH${}_3$OH) Maser Conditions near Supernova Remnants
• Very Large Array and Jansky Very Large Array observations of the compact radio sources in M8

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• First detection of the $J_{-1}\to (J-$ 1)${}_0-E$ methanol maser transitions at $J=7$ and $10$
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