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CS J=2-1 Observation Towards Massive Dense Cores

CS J=2-1 Observation Towards Massive Dense Cores. Yiping Ao 1 , Ji Yang 1 , Kazuyoshi Sunada 2 & Ken'ichi Tatematsu 3 1 Purple Mountain Observatory 2 Nobeyama Radio Observatory, Japan 3 National Astronomical Observatory of Japan. Goal and Selection Criteria. Goal

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CS J=2-1 Observation Towards Massive Dense Cores

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  1. CS J=2-1 Observation Towards Massive Dense Cores Yiping Ao1, Ji Yang1, Kazuyoshi Sunada2 & Ken'ichiTatematsu3 1 Purple Mountain Observatory 2 Nobeyama Radio Observatory, Japan 3 National Astronomical Observatory of Japan

  2. Goal and Selection Criteria • Goal To search the HMPO candidates. 2. Selection Criteria 39 sources are selected from the broad line wing sample and are associated with the FIR luminosity above 1000 L⊙.

  3. Observation • CS J=2-1 observations by Nobeyama 45m Telescope in Japan • Archive data of Radio Continuum observations by VLA

  4. Two examples

  5. Comparison among HII, UCHII and Non-detection sources Non-detection sources are deeply embedded in the dense gas

  6. Star Formation Efficiency • The LFIR/MVIR ratios differ much each other for low star forming regions, high-mass star forming regions and GMCs, but the ratio seems to be independent on the mass for each type of sources. • 2. From the dense gas survey of external galaxies, Gao & Solomon (2004) found that they shares the similar LFIR/MH2 ratio with a value of about 87 L⊙/M⊙, which is comparable with the value for the high-mass star forming regions in our Galaxy.

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