Disk-outflow models as applied to high mass star forming regions through methanol and water maser observations

Abstract

As the recent publication by Breen et al (2013) found Class II methanol masers are exclusively associated with high mass star forming regions. Based on the positions of the Class I and II methanol and H${}_2$O masers, UC H II regions and 4.5 $\mu$m infrared sources, and the center velocities ($v_{\text{LSR}}$) of the Class I methanol and H${}_2$O masers, compared to the $v_{\text{LSR}}$ of the Class II methanol masers, we propose three disk-outflow models that may be traced by methanol masers. In all three models, we have located the Class II methanol maser near the protostar, and the Class I methanol maser in the outflow, as is known from observations during the last twenty years. In our first model, the H${}_2$O masers trace the linear extent of the outflow. In our second model, the H${}_2$O masers are located in a circumstellar disk. In our third model, the H${}_2$O masers are located in one or more outflows near the terminating shock where the outflow impacts the ambient interstellar medium. Together, these models reiterate the utility of coordinated high angular resolution observations of high mass star forming regions in maser lines and associated star formation tracers.

57 pages, 22 figures, Accepted for publication in IJAA

References in corpus (5)

• Theory of Star Formation
• 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
• Confirmation of the exclusive association between 6.7-GHz methanol masers and high-mass star formation regions
• G10.472+0.027: An Extreme water maser outflow associated with a Massive Protostellar Cluster

Cited by in corpus (1)

• On the Relationship of UC H II Regions and Class II Methanol Masers: I. Source Catalogs