Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.5306s&link_type=abstract
American Astronomical Society Meeting 202, #53.06; Bulletin of the American Astronomical Society, Vol. 35, p.772
Astronomy and Astrophysics
Astronomy
Scientific paper
We report the detection of a massive rotating disk around the high-mass Class 0 candidate NGC 7538 S. The disk is well-resolved with BIMA in 3.4 mm continuum and in H13CN J = 1 - 0. It is seen nearly edge on and has a size of ˜30,000 au. It drives a young, powerful outflow perpendicular to the rotating disk mapped in SiO J = 2 - 1 and HCO+ J = 1 - 0. The dynamical age of the outflow is <= 10,000 yr. Assuming that the gas is gravitationally bound, the velocity gradient seen in H13CN implies a mass of the central object of ˜ 40 Msun. The mass of the continuum ``disk'' is >= 128 Msun and has a luminosity of ˜104 Lsun. H13CN gives a mass of ˜ 370 Msun for the rotating accretion disk, and the mass of the surrounding extended 20" envelope is ˜1300 Msun.
Our observations confirm that this is an extremely massive protostar in its earliest stages - a true Class 0 high mass protostar.
The BIMA array is operated by the Universities of California (Berkeley), Illinois, and Maryland with support from the National Science Foundation.
Forster Robert J.
Sandell Goeran
Wright Malcolm
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