Se p 20 06 Anatomy of HH 111 from CO observations : a bow shock driven molecular outflow

نویسندگان

  • Bertrand Lefloch
  • José Cernicharo
  • Bo Reipurth
  • Juan Ramon Pardo
  • Roberto Neri
چکیده

We present single-dish and interferometric millimeter line observations of the HH 111 outflow and its driving source. The physical conditions of the protostellar core have been determined from the emission of the millimeter line emission of CO and its isotopomers and CS with the IRAM 30m telescope, and the CO J = 7 → 6 line with the Caltech Submm Observatory. The molecular gas emission reveals a small condensation of cold (T = 20−25 K) and dense gas (n(H2) = 3×10 cm). The low-velocity outflowing gas has been mapped with the IRAMPlateau de Bure interferometer. The cold gas is distributed in a hollow cylinder surrounding the optical jet. The formation of this cavity and its kinematics are well accounted for in the frame of outflow gas entrainment by jet bow shocks. Evidence of gas acceleration is found along the cavity walls, correlated with the presence of optical bow shocks. The cavity has been expanding with a mean velocity of 4 km s on a timescale of 8700 yr, similar to the dynamical age of the optical jet. The separation of the inner walls reaches 8 − 10, which matches the transverse size of the wings in the bow shock. CSO observations of the J = 7 → 6 line show evidence of a high-velocity and hot gas component (T = 300−1000 K) with a low filling factor. This emission probably arises from shocked molecular gas in the jet. Observations of the P2−P1 [CI] line are consistent with C-type non-dissociative shocks. Mapping of the high-velocity molecular bullets B1-B3, located beyond the optical jet, with the IRAM PdBI reveals small structures of 3× 7 flattened perpendicular to the flow direction. They are made of cold (T ∼ 30 K), moderate density gas (n(H2) = (0.5− 1.0)× 10 cm). We find evidence that the bullets are expanding into the low-density surrounding medium. Their properties are consistent with their being shocked gas knots resulting from past time-variable ejections in the jet. Subject headings: ISM:jets and outflows Stars:formation ISM:clouds ISM:individual:HH 111

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Anatomy of Hh 111 from Co Observations: a Bow-shock-driven Molecular Outflow

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تاریخ انتشار 2006