Massive Expanding Torus and Fast Outflow in Planetary Nebula NGC 6302

摘要: We present interferometric observations of 12CO and 13CO J = 2–1 emission from the butterfly-shaped, young planetary nebula NGC 6302. The high angular resolution sensitivity achieved in our allow us to resolve into two distinct kinematic components: (1) a massive expanding torus seen almost edge-on oriented north-south direction (roughly perpendicular optical axis), which exhibits very complex fragmented structure; (2) high-velocity molecular knots moving at more than 20 km s−1 located bipolar lobes. These show linear position-velocity gradient (Hubble-like flow), is characteristic fast outflow nebulae. From low but variable 12CO/13CO line intensity ratio, we conclude that optically thick over much nebula. Using thinner 2–1, estimate total gas mass ~0.1 M☉, comparable ionized mass; 6302 nebula, including photon dominated region, found be ~0.5 M☉. radiative transfer modeling, infer an inclination angle 75° with respect plane sky, velocity 15 s−1. Comparison recent also discussed.