High-resolution mm interferometry and the search for massive protostellar disks: the case of Cep-A HW2

Details High-resolution mm interferometry and the search for massive protostellar disks: the case of Cep-A HW2 High-resolution mm interferometry and the search for massive protostellar disks: the case of Cep-A HW2

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ap%26ss.313...59c&link_type=abstract

Astrophysics and Space Science, Volume 313, Issue 1-3, pp. 59-63

Astronomy and Astrophysics

Astronomy

High-Mass Star Formation, Millimeter-Wavelength Radioastronomy, Millimeter Interferometry, High-Mass Disks

Scientific paper

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.

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