A 1000 AU rotating disk around the massive young stellar object G192.16-3.82

We present evidence for a circumstellar disk around the luminous young stel lar object G192.16 - 3.82. Observations of 2.6 mm, 7 mm, and 3.6 cm continu um emission and (CO)-C-13, (CO)-O-18, and H2O maser line emission support t he interpretation that a 1000 AU rotating disk exists around the central B2 star. The disk major axis is roughly perpendicular to the outflow, and the maser velocities are consistent with Keplerian rotation. The mass of the d isk plus circumstellar envelope traced by millimeter continuum emission is similar to 15 M.. The source is embedded in a 500 M. molecular cloud from w hich a massive outflow emerges. Updated outflow parameters yield a total fl ow mass of 95 M. and a mass flow rate of 5.6 x 10(-4) M. yr(-1). The outflo w opening angle, defined by a 13CO shell, is approximately 90 degrees. A we ak, one-sided, ionized jet emanates from the young stellar object system. T he estimated momentum rate of the jet (similar to 10(-3) M. km s(-1) yr(-1) ) is about a factor of 4 too low to power the flow. These results are consi stent with the idea that the G192.16 outflow mechanism can be best characte rized by a combination of a weak jet and a strong, wide-angle wind. Approxi mately 0 ".5 to the north of G192.16-3.82 is a band of 3.6 cm continuum emi ssion and redshifted H2O maser components which we interpret to be due to a newly discovered jet from the embedded object G192.16-3.82 N. The jet does not affect the dynamics of the massive outflow significantly which indicat es that it is probably due to a low-mass young stellar object.