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ROD17 - A Catalog of 44 GHz Methanol Masers in Massive Star-forming Regions. IV. The High-mass Protostellar Object Sample

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Short title: Rodriguez-Garza et al. (2017)
Authors: Rodríguez-Garza, C. B. Kurtz, S. E. Gómez-Ruiz, A. I. Hofner, P. Araya, E. D. Kalenskii, S. V.
Journal: The Astrophysical Journal Supplement Series, Volume 233, Issue 1, article id. 4, 18 pp. (2017).
Bibcode:

Target type: High_mass_SFR,HII
Transitions: SiO_1-0v0,CH3OH_25-30_GHz(I),CH3OH_36(I),CH3OH_44(I),CH3OH_84(I),CH3OH_95(I),CH3OH_6(II),CH3OH_37(II),CH3OH_38(II)

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, H II regions, and shocks traced by 4.5 mum 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. eprintid: arXiv:1709.09773	Comments: 56 massive star-forming regions

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, H II regions, and shocks traced by 4.5 mum 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. eprintid:

Comments:
56 massive star-forming regions

Input tables: Tables 3, 4
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Detection table from Rodriguez-Garza et al. (2017)

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Obs. RA	Obs. Dec	RA offset	Dec offset	#	Source name	V_peak	F_peak	∫F dv
(J2000)	(J2000)	(mas)	(mas)			(km/s)	(Jy)	(Jy*km/s)

Non-detection table from Rodriguez-Garza et al. (2017)