Molecular Gas and Dust in the Massive Star Forming Region S 233 IR
Mao Ruiqing; Qin Zeng
Source PublicationChinese Journal of Astronomy and Astrophysics
AbstractThe massive star forming region S 233 IR is observed in the molecular lines CO J = 2-1, 3-2, NH3 (1,1), (2,2) and the 870μm dust continuum. Four submillimeter continuum sources, labelled SMM 1-4, are revealed in the 870μm dust emission. The main core, SMM1, is found to be associated with a deeply embedded near infrared cluster in the northeast; while the weaker source SMM2 coincides with a more evolved cluster in the southwest. The best fit spectral energy distribution of SMM1 gives an emissivity ofβ = 1.6, and temperatures of 32 K and 92 K for the cold- and hot-dust components. An SMM1 core mass of 246 M⊙ and a total mass of 445 M⊙ are estimated from the 870 μm dust continuum emission.SMM1 is found to have a temperature gradient decreasing from inside out, indicative of the presence of interior heating sources. The total outflow gas mass as traced by the CO J - 3-2 emission is estimated to be 35 M⊙. Low velocity outflows are also found in the NH3 (1,1) emission. The non-thermal dominant NH3 line width as well as the substantial core mass suggest that the SMM1 core is a "turbulent,massive dense core", in the process of forming a group or a cluster of stars. The much higher star formation efficiency found in the southwest cluster supports the suggestion that this cluster is more evolved than the northeast one. Large near infrared photometric variations found in the source PCS-IR93, a previously found highly polarized nebulosity, indicate an underlying star showing the FU Orionis type of behavior.
Document Type期刊论文
First Author Affilication中国科学院紫金山天文台
Recommended Citation
GB/T 7714
Mao Ruiqing,Qin Zeng. Molecular Gas and Dust in the Massive Star Forming Region S 233 IR[J]. Chinese Journal of Astronomy and Astrophysics,2004,4(5):440.
APA Mao Ruiqing,&Qin Zeng.(2004).Molecular Gas and Dust in the Massive Star Forming Region S 233 IR.Chinese Journal of Astronomy and Astrophysics,4(5),440.
MLA Mao Ruiqing,et al."Molecular Gas and Dust in the Massive Star Forming Region S 233 IR".Chinese Journal of Astronomy and Astrophysics 4.5(2004):440.
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