Extended HNCO, SiO, and HC3N emission in 43 southern star-forming regions
He Y.-X. Henkel C. Zhou J.-J. Esimbek J. Stutz A.M. Liu H.-L. Ji W.-G. Li D.-L. Wu G. Tang X.-D. Komesh T. Sailanbek S.
16 February 2021American Astronomical Society
Astrophysical Journal, Supplement Series
2021#253Issue 1
We have selected 43 southern massive star-forming regions to study the spatial distribution of HNCO 404-303, SiO 2-1, and HC3N 10-9 line emission and to investigate their spatial association with the dust emission. The morphology of HNCO 404-303 and HC3N 10-9 agrees well with the dust emission. HC3N 10-9 tends to originate from more compact regions than HNCO 404-303 and SiO 2-1. We divided our sources into three groups: those in the Central Molecular Zone (CMZ), those associated with bubbles (Bubble), and the remaining sources, which are termed normal star-forming regions(NMSFR). These three groups, subdivided into three different categories with respect to line widths, integrated intensities, and column densities, hint at the presence of different physical and chemical processes. We find that the dust temperature Td, and the abundance ratios NHNCO/NSiO and NHNCO/NHC3N show a decreasing trend toward the central dense regions of CMZ sources, while NHC3N/NSiO moves in the opposite direction. Moreover, a better agreement is found between Td and NHC3N/NSiO in Bubble and NMSFR category sources. Both outflow and inflow activities have been found in eight of the 16 bubble and NMSFR sources. The low outflow detection rate indicates either that in these sources the SiO 2-1 line wing emission is below our sensitivity limit or that the bulk of the SiO emission may be produced by the expansion of an H II region or supernova remnant, which has pushed molecular gas away, forming a shock and yielding SiO.
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Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, 830011, China
Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Urumqi, 830011, China
Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS, Beijing, 100012, China
Departmento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Concepción, Chile
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, D-53121, Germany
Astron. Dept., King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
Max-Planck-Institute for Astronomy, Königstuhl 17, Heidelberg, D-69117, Germany
Department of Astronomy, Yunnan University, Kunming, 650091, China
Department of Solid State Physics and Nonlinear Physics, Faculty of Physics and Technology, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
University of the Chinese Academy of Sciences, Beijing, 100080, China
Xinjiang Astronomical Observatory
Key Laboratory of Radio Astronomy
Chinese Academy of Sciences South America Center for Astronomy
Departmento de Astronomía
Max-Planck-Institut für Radioastronomie
Astron. Dept.
Max-Planck-Institute for Astronomy
Department of Astronomy
Department of Solid State Physics and Nonlinear Physics
University of the Chinese Academy of Sciences
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