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Millimetre spectral line mapping observations towards four massive star-forming H II regions
Li, Shanghuo1,2,3; Wang, Junzhi1,4; Zhang, Zhi-Yu5,6; Fang, Min7,8; Li, Juan1,4; Zhang, Jiangshui3; Fan, Junhui3; Zhu, Qingfeng9; Li, Fei1,2,10
2017-04-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume466Issue:1Pages:248-275
Corresponding AuthorLi, Shanghuo(shanghuo.li@shao.ac.cn) ; Wang, Junzhi(jzwang@shao.ac.cn)
AbstractWe 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.
Keywordstars: formation stars: massive stars: winds, outflows ISM: clouds radio lines: stars submillimetre: stars
DOI10.1093/mnras/stw3076
WOS KeywordNITROGEN ISOTOPIC FRACTIONATION ; GALACTIC CHEMICAL EVOLUTION ; DENSE INTERSTELLAR CLOUDS ; CYGNUS-X REGION ; ORION-KL ; MOLECULAR OUTFLOW ; HIGH-RESOLUTION ; CEPHEUS-A ; DEUTERIUM FRACTIONATION ; COMPARATIVE CHEMISTRY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000398112400019
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23148
Collection中国科学院紫金山天文台
Corresponding AuthorLi, Shanghuo; Wang, Junzhi
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100049, Peoples R China
3.GuangZhou Univ, Ctr Astrophys, GuangZhou Higher Educ Mega Ctr, 230 Wai Huan Xi Rd, Guangzhou 510006, Guangdong, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
5.Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland
6.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
7.Univ Arizona, Dept Astron, 933 N Cherry Ave, Tucson, AZ 85721 USA
8.Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA
9.Univ Sci & Technol, Chinese Acad Sci, Dept Astron, Hefei 210008, Peoples R China
10.Hebei Normal Univ, Coll Phys & Informat Engn, Shijiazhuang 050024, Peoples R China
Recommended Citation
GB/T 7714
Li, Shanghuo,Wang, Junzhi,Zhang, Zhi-Yu,et al. Millimetre spectral line mapping observations towards four massive star-forming H II regions[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,466(1):248-275.
APA Li, Shanghuo.,Wang, Junzhi.,Zhang, Zhi-Yu.,Fang, Min.,Li, Juan.,...&Li, Fei.(2017).Millimetre spectral line mapping observations towards four massive star-forming H II regions.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,466(1),248-275.
MLA Li, Shanghuo,et al."Millimetre spectral line mapping observations towards four massive star-forming H II regions".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 466.1(2017):248-275.
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