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    Inflow Motions Associated with High-mass Protostellar Objects

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    Yoo_2018_ApJS_235_31.pdf
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    Description:
    Final Published Version
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    Author
    Yoo, Hyunju
    Kim, Kee-Tae
    Cho, Jungyeon
    Choi, Minho
    Wu, Jingwen cc
    Evans, Neal J., II
    Ziurys, L. M.
    Affiliation
    Univ Arizona, Dept Astron
    Univ Arizona, Steward Observ
    Issue Date
    2018-04-02
    Keywords
    ISM: kinematics and dynamics
    ISM: molecules
    radio lines: ISM
    stars: formation
    
    Metadata
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    Publisher
    IOP PUBLISHING LTD
    Citation
    Hyunju Yoo et al 2018 ApJS 235 31
    Journal
    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
    Rights
    © 2018. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We performed a molecular line survey of 82 high-mass protostellar objects in a search for inflow signatures associated with high-mass star formation. Using the (HCO+)-C-13 (1-0) line as an optically thin tracer, we detected a statistically significant excess of blue asymmetric line profiles in the HCO+ (1-0) transition, but nonsignificant excesses in the HCO+ (3-2) and H2CO (2(12)-1(11)) transitions. The negative blue excess for the HCN (3-2) transition suggests that the line profiles are affected by dynamics other than inflow motion. The HCO+ (1-0) transition thus seems to be the suitable tracer of inflow motions in high-mass star-forming regions, as previously suggested. We found 27 inflow candidates that have at least 1 blue asymmetric profile and no red asymmetric profile, and derived the inflow velocities to be 0.23-2.00 km s(-1) for 20 of them using a simple two-layer radiative transfer model. Our sample is divided into two groups in different evolutionary stages. The blue excess of the group in relatively earlier evolutionary stages was estimated to be slightly higher than that of the other in the HCO+ (1-0) transition.
    ISSN
    1538-4365
    DOI
    10.3847/1538-4365/aab35f
    Version
    Final published version
    Sponsors
    National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2016R1D1A1B02015014]
    Additional Links
    http://stacks.iop.org/0067-0049/235/i=2/a=31?key=crossref.6f3703d04b5b6c5bba011f9430e124b9
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4365/aab35f
    Scopus Count
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    UA Faculty Publications

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