A Disk/Jet System toward the High-mass Young Star in AFGL 5142

Details A Disk/Jet System toward the High-mass Young Star in AFGL 5142 A Disk/Jet System toward the High-mass Young Star in AFGL 5142

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19913413z&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #134.13; Bulletin of the American Astronomical Society, Vol. 33, p.1504

Astronomy and Astrophysics

Astronomy

Scientific paper

We present observational studies of a high-mass star forming region AFGL 5142 in the {NH3} (J,K)=(1,1), (2,2), (3,3) and (4,4) inversion transitions. We discover a compact structure of 1'' (or 1800AU) in {NH3} emission toward the position of a high-mass young star. The star, with a spectral type of B2 if it is at the zero-age main-sequence, excites a weak centimeter continuum source and drives a well collimated SiO jet. The compact {NH3} structure, with a temperature of 70 K, gives rise to a broad {NH3} line emission of 6.4 km s-1 (full width at half maximum). The small size of the {NH3} feature, broad line emission and the association with a SiO jet indicate that the object is most likely an unresolved rotating disk. The compact disk is embedded in a flattened core of gas temperatures of about 20 K. The extended core delineates an `X' shape with the SiO jet located in the void of the dense and cold {NH3} gas. A faint component of {NH3} emission can be identified, especially in the highly excited {NH3} (3,3) and (4,4) lines, tracing the SiO jet. This component, arising from hot gas of about 170 K, is likely heated by shocks in the outflow. The coincidence of a disk and a jet with the radio continuum source toward AFGL 5142 indicates that this high-mass star may have formed via a disk mediated accretion process.

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