High angular resolution observations of the high-mass protostar NGC 7538S

Details High angular resolution observations of the high-mass protostar NGC 7538S High angular resolution observations of the high-mass protostar NGC 7538S

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.9802s&link_type=abstract

American Astronomical Society Meeting 205, #98.02; Bulletin of the American Astronomical Society, Vol. 36, p.1505

Astronomy and Astrophysics

Astronomy

Scientific paper

We present deep high angular resolution images of the high-mass protostar NGC 7538S in CH3CN J=12-11, DCN J=3-2 and in 3 mm and 1.4 mm continuum obtained with BIMA at a resolution of 3.2''. We also present deep VLA images at angular resolutions of ≤ 1'' at 6 cm, 3.6 cm, 2 cm and 1.3 cm, which show that the protostar drives a highly collimated ionized jet emerging from the center of the accretion disk. The CH3CN emission is hot; we detect lines up to K=6, but the emission at higher K-levels is dominated by the outflow. The size of the disk becomes smaller for each step up the K-ladder, i.e. we cannot assume that the transitions originate in the same volume of gas. The lower K-transitions are optically thick and display narrow self-absorption at slightly redshifted velocities up to K=3. The high optical depth is confirmed by detection of CH313CN K=2 and 3. Red-shifted self-absorption and high velocity emission is also seen in DCN, partly masking the underlying emission from the rotating accretion disk. These observations suggest a disk size of 5.5'' (15,000 A.U.). The rotation curve measured in DCN predicts an enclosed mass of 20 M&sun;/sin2i.
This work was supported in part by NSF Grant AST 0228963 to the University of California.

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