High-resolution mm interferometry and the search for massive protostellar disks: the case of Cep-A HW2 |
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| Authors: | Claudia Comito Peter Schilke Ulrike Endesfelder Izaskun Jiménez-Serra Jesus Martín-Pintado |
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| Institution: | (1) Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany;(2) Consejo Superior de Investigaciones Científicas, Departamento de Astrofísica Molecular e Infrarroja, Instituto de Estructura de la Materia, C/Serrano 121, 28006 Madrid, Spain |
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| Abstract: | The direct detection of accretion onto massive protostars through rotating disks constitutes an important tile in the massive-star-formation-theory
mosaic. This task is however observationally very challenging. A very interesting example is Cepheus A HW2. The properties
of the molecular emission around this YSO seems to suggest the presence of a massive rotating disk (cf. Patel et al. in Nature
437:109, 2005). We have carried out sub-arcsec-resolution PdBI observations of high-density and shock tracers such as SO2, SiO, CH3CN, and CH3OH towards the center of the outflow. A detailed analysis of the spatial distribution and of the velocity field traced by
all observed species leads us to conclude that, on a ∼700 AU scale, the Cep-A “disk” is actually the result of the superposition
of multiple hot-core-type objects, at least one of them ejecting an outflow at a small angle with respect to the line of sight.
Together with the well-known large-scale outflow ejected by HW2, this setup makes for a very complex spatial and kinematic
picture.
Based on observations carried out with the IRAM Plateau de Bure Interferometer. IRAM is supported by INSU/CNRS (France), MPG
(Germany) and IGN (Spain). |
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| Keywords: | High-mass star formation Millimeter-wavelength radioastronomy Millimeter interferometry High-mass disks |
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