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    Millimetre spectral line mapping observations towards four massive star-forming H ii regions

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    Author
    Li, Shanghuo
    Wang, Junzhi
    Zhang, Zhi-Yu cc
    Fang, Min cc
    Li, Juan
    Zhang, Jiangshui
    Fan, Junhui
    Zhu, Qingfeng
    Li, Fei
    Affiliation
    Univ Arizona, Dept Astron
    Issue Date
    2017-01-05
    Keywords
    stars: formation
    stars: massive
    stars: winds, outflows
    ISM: clouds
    radio lines: stars
    submillimetre: stars
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    Millimetre spectral line mapping observations towards four massive star-forming H ii regions 2017, 466 (1):248 Monthly Notices of the Royal Astronomical Society
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
    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 present spectral line mapping observations towards four massive star-forming regions Cepheus A, DR21S, S76E and G34.26+0.15 - with the IRAM 30-m telescope at the 2 and 3 mm bands. In total, 396 spectral lines from 51 molecules, one helium recombination line, 10 hydrogen recombination lines and 16 unidentified lines were detected in these four sources. An emission line of nitrosyl cyanide (ONCN, 14(0), 14-13(0), (13)) was detected in G34.26+0.15, as the first detection in massive star-forming regions. We found that c-C3H2 and NH2D show enhancement in shocked regions, as suggested by the evidence of SiO and/or SO emission. The column density and rotational temperature of CH3CN were estimated with the rotational diagram method for all four sources. Isotope abundance ratios of C-12/C-13 were derived using HC3N and its C-13 isotopologue, which were around 40 in all four massive star-forming regions and slightly lower than the local interstellar value (similar to 65). The N-14/N-15 and O-16/O-18 abundance ratios in these sources were also derived using the double isotopic method, which were slightly lower than in the local interstellar medium. Except for Cep A, the S-33/S-34 ratios in the other three targets were derived, which were similar to that in the local interstellar medium. The column density ratios of N(DCN)/N(HCN) and N( DCO+)/N(HCO+) in these sources were more than two orders of magnitude higher than the elemental [D]/[H] ratio, which is 1.5 x 10(-5). Our results show that the later stage sources, G34.26+0.15 in particular, present more molecular species than earlier stage sources. Evidence of shock activity is seen in all stages studied.
    ISSN
    0035-8711
    1365-2966
    DOI
    10.1093/mnras/stw3076
    Version
    Final published version
    Sponsors
    China Ministry of Science and Technology under the State Key Development Programme for Basic Research [2012CB821800]; Natural Science Foundation of China [11173013]; European Research Council [321302]; Natural Science Foundation of Anhui Province of China [1408085MA13]
    Additional Links
    https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw3076
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stw3076
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