ATOMS: ALMA three-millimetre observations of massive star-forming regions – XVI. Neutral versus ion line widths

ABSTRACT It has been suggested that the line width of ions in molecular clouds is narrower than that of the co-existing neutral particles, which has been interpreted as an indication of the decoupling of neutral turbulence from magnetic fields within a partially ionized environment. We calculate the principal component analysis (PCA) correlation coefficients of CCH versus H$^{13}$CO$^{+}$ and H$^{13}$CN versus H$^{13}$CO$^{+}$. We find aside from H$^{13}$CN, CCH could also be strongly spatial correlated with H$^{13}$CO$^{+}$ in high-mass star-forming regions. CCH and H$^{13}$CO$^{+}$ line emissions are strongly spatial correlated with each other in 48 per cent sources with a PCA correlation coefficient over 0.7. So, we investigate the ambipolar diffusion (AD) effect using CCH and H$^{13}$CO$^{+}$ lines as a neutral/ion pair in a sample of 129 high-mass star-forming clumps. We conduct a careful analysis of line widths of the CCH–H$^{13}$CO$^{+}$ pair pixel-by-pixel in 12 sources, which show a strong correlation in CCH–H$^{13}$CO$^+$ emission and no obvious outflows or multiple velocity components. The mean velocity dispersion of CCH is about the same as H$^{13}$CO$^{+}$ in 12 sources. In low-density regions of most sources, CCH shows a broader velocity dispersion than H$^{13}$CO$^{+}$. However, the AD effect is not significant from a statistical point of view.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-08-20
DOI
https://doi.org/10.1093/mnras/stae1998
Citations
1
Primary Topic
Astrophysics and Star Formation Studies
Type
article
Field-Weighted Citation Impact
0.33

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article

ATOMS: ALMA three-millimetre observations of massive star-forming regions – XVI. Neutral versus ion line widths

Jihye Hwang, Fengwei Xu, M. Juvela, Feng-Yao Zhu et al.
1 citations
Monthly Notices of the Royal Astronomical Society
Astrophysics and Star Formation Studies
0.33
article

ATOMS: ALMA three-millimetre observations of massive star-forming regions – XVI. Neutral versus ion line widths

Jihye Hwang, Fengwei Xu, M. Juvela, Feng-Yao Zhu, Anandmayee Tej, Chang Won Lee, Wenyu Jiao, Sihan Jiao, Jinbo Wu, Zhiyuan Ren, L. Bronfman, James O. Chibueze, Ken’ichi Tatematsu, Archana Soam, Hongli Liu, Di Li, Chao Zhang, J. W. Zhou, Swagat Das, Tie Liu, Ke Wang
article en
1 citations

Abstract

ABSTRACT It has been suggested that the line width of ions in molecular clouds is narrower than that of the co-existing neutral particles, which has been interpreted as an indication of the decoupling of neutral turbulence from magnetic fields within a partially ionized environment. We calculate the principal component analysis (PCA) correlation coefficients of CCH versus H$^{13}$CO$^{+}$ and H$^{13}$CN versus H$^{13}$CO$^{+}$. We find aside from H$^{13}$CN, CCH could also be strongly spatial correlated with H$^{13}$CO$^{+}$ in high-mass star-forming regions. CCH and H$^{13}$CO$^{+}$ line emissions are strongly spatial correlated with each other in 48 per cent sources with a PCA correlation coefficient over 0.7. So, we investigate the ambipolar diffusion (AD) effect using CCH and H$^{13}$CO$^{+}$ lines as a neutral/ion pair in a sample of 129 high-mass star-forming clumps. We conduct a careful analysis of line widths of the CCH–H$^{13}$CO$^{+}$ pair pixel-by-pixel in 12 sources, which show a strong correlation in CCH–H$^{13}$CO$^+$ emission and no obvious outflows or multiple velocity components. The mean velocity dispersion of CCH is about the same as H$^{13}$CO$^{+}$ in 12 sources. In low-density regions of most sources, CCH shows a broader velocity dispersion than H$^{13}$CO$^{+}$. However, the AD effect is not significant from a statistical point of view.

Monthly Notices of the Royal Astronomical SocietyVol. 533(4)
University of Nigeria (NG), University of Helsinki (FI), Pioneer (United States) (US), Indian Institute of Astrophysics (IN), University of South Africa (ZA), Taiyuan Normal University (CN), University of Cologne (DE), Yunnan University (CN), Chinese Academy of Sciences (CN), The Graduate University for Advanced Studies, SOKENDAI (JP), Peking University (CN), North-West University (ZA), Shanghai Astronomical Observatory (CN), Helsinki Institute of Physics (FI), Korea Astronomy and Space Science Institute (KR), Kavli Institute for Theoretical Sciences (CN), Zhejiang Lab (CN), Max Planck Institute for Radio Astronomy (DE), National Astronomical Observatory of Japan (JP), National Astronomical Observatories (CN), University of Chinese Academy of Sciences (CN), University of Chile (CL), Indian Institute of Space Science and Technology (IN), Korea University of Science and Technology (KR), Tsinghua University (CN)
National Science Foundation, National Natural Science Foundation of China, Academy of Finland, Chinese Academy of Sciences, Korea Astronomy and Space Science Institute, Ministry of Education, Science and Technology, National Astronomical Observatory of Japan, Ministry of Science and ICT, South Korea, Agencia Nacional de Investigación y Desarrollo, Japan Society for the Promotion of Science, National Institutes of Natural Sciences, National Key Research and Development Program of China
Openalex Percentile: Top 35%
Astrophysics and Star Formation Studies
0.33
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