Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 1K051

Detection of the bullet-like SiO jet and dense CH3CN envelope around the high mass protostellar object G353.273+0.641

Motogi, Kazuhito (Yamaguchi University)
Sugiyama, Koichiro (Yamaguchi University)
Walsh, Andrew, J (Curtin University)
Niinuma, Kotaro (Yamaguchi University)
Sorai, Kazuo (Hokkaido University)
Honma, Mareki (NAOJ)
Hirota, Tomoya (NAOJ)
Yonekura, Yoshinori (Ibaraki University)
Fujisawa, Kenta (Yamaguchi University)

Abstract:
We report on the millimeter observations towards the high mass protostellar object, G353.273+0.641 that is a candidate of a pole-on disk-jet system, and known to be the host of singular blue-shift dominated SiO jet. Our first imaging observations have shown that the SiO jet consists of point-like bullets. The hot (~230 K) rotation temperature of the bullet and its short dynamical time (360 yr) suggest that this extremely high-velocity molecular jet traces the innermost mass-loss activity. The SiO column density is very high (4 x 10^15 cm^-2), suggesting the large outflow rate and/or high SiO abundance. We also detected warm (~115 K) and compact (< 2500 AU in radius) CH3CN core that is probably tracing a face-on disk with dense envelope. The CH3CN core is well optically thick and the H2 column density is estimated to be higher than 10^24 cm^-2. We are now planning the further high-resolution observation with the ALMA.

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