High-Resolution Mid-Infrared Imaging of G339.88-1.26

Abstract

G339.88-1.26 is considered to be a good candidate for a massive star with a circumstellar disk. This has been supported by the observations of linearly distributed methanol maser spots believed to delineate this disk, and mid-infrared observations that have discovered a source at this location that is elongated at the same position angle as the methanol maser distribution. We used the mid-infrared imager/spectrometer OSCIR at Keck to make high-resolution images of G339.88-1.26. We resolve the mid-infrared emission into 3 sources within 1.5 arcsec of the location of the masers. We determine that the methanol masers are most likely not located in a circumstellar disk. Furthermore we find that the observed radio continuum emission most likely comes from two sources in close proximity to each other. One source is an unobscured massive star with an extended HII region that is responsible for the peak in the radio continuum emission. A second source is embedded and centered on the elongation in the radio continuum emission that is believed to be tracing an outflow in this region.

12 pages, 2 figures, Accepted for publication in ApJ

References in corpus (1)

• Mid-infrared imaging of the massive young star AFGL 2591: Probing the circumstellar environment of an outflow source

Cited by in corpus (17)

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• An Ordered Envelope-disk Transition in the Massive Protostellar Source G339.88-1.26
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• The 6.7-GHz and 25-GHz methanol masers in OMC-1
• Discovery of new 19.9-GHz methanol masers in star forming regions
• The SOFIA Massive (SOMA) Star Formation Survey. II. High Luminosity Protostars
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• Testing the Hypothesis that Methanol Maser Rings Trace Circumstellar Disks: High Resolution Near-IR and Mid-IR Imaging
• High Resolution Mid-Infrared Imaging of Radio Ultra-Compact HII Regions
• Evolution of HII regions in hierarchically structured molecular clouds
• SCOTCH Search for Clandestine Optically Thick Compact HII regions II
• The infrared environments of masers associated with star formation