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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 358831.0, MPI für Astronomie / Publikationen_mpia
An H2CO 6 cm maser pinpointing a possible circumstellar torus in IRAS 18566+0408
Authors:Araya, E.; Hofner, P.; Sewilo, M.; Goss, W. M.; Linz, H.; Kurtz, S.; Olmi, L.; Churchwell, E.; Rodríguez, L. F.; Garay, G.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Volume:669
Start Page:1050
End Page:1057
Audience:Not Specified
Abstract / Description:We report observations of 6 cm, 3.6 cm, 1.3 cm, and 7 mm radio continuum, conducted with the Very Large Array, toward IRAS 18566+0408, one of the few sources known to harbor H2CO 6 cm maser emission. Our observations reveal that the emission is dominated by an ionized jet at centimeter wavelengths. Spitzer IRAC images from GLIMPSE support this interpretation, given the presence of 4.5 mum excess emission at approximately the same orientation as the centimeter continuum. The 7 mm emission is dominated by thermal dust from a flattened structure almost perpendicular to the ionized jet; thus, the 7 mm emission appears to trace a torus associated with a young massive stellar object. The H2CO 6 cm maser is coincident with the center of the torus-like structure. Our observations rule out radiative pumping via radio continuum as the excitation mechanism for the H2CO 6 cm maser in IRAS 18566+0408.
Free Keywords:ISM: H II Regions; ISM: individual (IRAS 18566+0408); ISM: Molecules; Masers; Stars: Formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2007ApJ...669.1050A
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