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Effect of Optical Depth on The Study of Chemical Properties of Massive Star forming Clumps
lirunxia@xao.ac.cn
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, P. R. China
Abstract:
Here we present the study on chemical properties of massive star forming clumps using N2H+(1-0), H13CO+(1-0), HCN (1-0) and HN13C (1-0) data from the literature. We found that abundances of H13CO+ and HN13C are still affected by H2 column densities, so they are not very optically thin. As the median values of these two abundances increase nearly 10 times from stage A to B, H13CO+ and HN13C are suitable for tracing the evolution of massive star forming clumps. The order of rapidity in growth of abundances of all the four studied molecules from stage A to B, from the highest to the lowest, is H13CO+, HCN, HN13C and N2H+. Our results suggest that observing optically thin molecular lines with the higher angular resolution is necessary to study the chemical evolution of massive star forming clumps.
Key words:  stars: formation — ISM: clumps — ISM: molecules — radio lines: ISM
FundProject:
Effect of Optical Depth on The Study of Chemical Properties of Massive Star forming Clumps
lirunxia@xao.ac.cn
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, P. R. China
摘要:
Here we present the study on chemical properties of massive star forming clumps using N2H+(1-0), H13CO+(1-0), HCN (1-0) and HN13C (1-0) data from the literature. We found that abundances of H13CO+ and HN13C are still affected by H2 column densities, so they are not very optically thin. As the median values of these two abundances increase nearly 10 times from stage A to B, H13CO+ and HN13C are suitable for tracing the evolution of massive star forming clumps. The order of rapidity in growth of abundances of all the four studied molecules from stage A to B, from the highest to the lowest, is H13CO+, HCN, HN13C and N2H+. Our results suggest that observing optically thin molecular lines with the higher angular resolution is necessary to study the chemical evolution of massive star forming clumps.
关键词:  stars: formation — ISM: clumps — ISM: molecules — radio lines: ISM
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