The Morphology of M17-UC1 - A Disk Candidate Surrounding a Hypercompact HII Region
M. Nielbock, R. Chini, V. H. Hoffmeister, C. M. Scheyda, J. Steinacker, D. Nuernberger, R. Siebenmorgen
Abstract
We investigate the morphology and the evolutionary stage of the hypercompact HII region M17-UC1 using observations at infrared wavelengths and NIR radiative transfer modeling. For the first time, this region is resolved into two emission areas separated by a dark lane reminiscent of an obscuring silhouette of a circumstellar disk. So far, the observational data as well as model calculations suggest that M17-UC1 is surrounded by a disk of cool dust. This direct direct detection of a circumstellar disk candidate around a hypercompact HII region is in agreement with the expectations of the disk accretion model for high-mass star formation.
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