An H2CO 6cm Maser Pinpointing a Possible Circumstellar Torus in IRAS18566+0408

2); 7); Chile.); E. Araya (1; E. Churchwell (3); Florence; Germany. (5) Centro de Radioastronomia y Astrofisica; G. Garay (8) ((1) New Mexico Institute of Mining; Heidelberg; H. Linz (4)

An H2CO 6cm Maser Pinpointing a Possible Circumstellar Torus in IRAS18566+0408

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arxiv 0708.3832 v1 submitted 2007-08-28 astro-ph

An H2CO 6cm Maser Pinpointing a Possible Circumstellar Torus in IRAS18566+0408

E. Araya (1 , 2) , P. Hofner (1 , M. Sewilo (3) , W. M. Goss (2) , H. Linz (4) , S. Kurtz (5) , L. Olmi (6

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7) E. Churchwell (3) L. F. Rodriguez (5) G. Garay (8) ((1) New Mexico Institute of Mining Technology Socorro NM USA. (2) National Radio Astronomy Observatory USA. (3) Department of Astronomy University of Wisconsin-Madison Madison WI USA. (4) Max-Planck-Institut f"ur Astronomie Heidelberg Germany. (5) Centro de Radioastronomia y Astrofisica Universidad Autonoma de Mexico Morelia Michoacan Mexico. (6) Istituto di Radioastronomia INAF Florence Italy. (7) University of Puerto Rico at Rio Piedras San Juan Puerto Rico. (8) Departamento de Astronomia Universidad de Chile Santiago Chile.)

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keywords emissionh2comasercontinuumiras18566observationsdominatedionized

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We report observations of 6cm, 3.6cm, 1.3cm, and 7mm radio continuum, conducted with the Very Large Array towards IRAS18566+0408, one of the few sources known to harbor H2CO 6cm maser emission. Our observations reveal that the emission is dominated by an ionized jet at cm wavelengths. Spitzer/IRAC images from GLIMPSE support this interpretation, given the presence of 4.5um excess emission at approximately the same orientation as the cm continuum. The 7mm emission is dominated by thermal dust from a flattened structure almost perpendicular to the ionized jet, thus, the 7mm emission appears to trace a torus associated with a young massive stellar object. The H2CO 6cm 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 6cm maser in IRAS18566+0408.

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