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Millimetre line observations towards four local galaxies
Li, Fei1,2,3; Wang, Junzhi1,4; Kong, Minzhi3; Li, Shanghuo1,2,5
2019-02-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume482Issue:4Pages:4763-4776
Corresponding AuthorLi, Fei(lifei@shao.ac.cn) ; Wang, Junzhi(jzwang@shao.ac.cn) ; Kong, Minzhi(confucious_76@163.com)
AbstractWe present results of millimetre line observations towards four local gas-rich galaxies (NGC 3079, NGC 4258, NGC 6240, and VII Zw 31) with the IRAM 30m millimetre telescope. More than 33 lines in these four sources were detected, including normal dense gas tracers (HCN 1-0, HCO+ 1-0, and C2H 1-0, etc.) and their isotopic species. (HCN)-C-13 (1-0) and (HCO+)-C-13 (1-0) are detected for the first time in NGC 4258. Optical depths of HCN 1-0 and HCO+ 1-0 were estimated with detected isotopic lines in NGC 4258, which were 4.1 and 2.6, respectively. HC3N J = 29-28, which requires high-volume density and high temperature to excite, was detected in NGC 6240. High ratios of HCO+/HCN in NGC 4258 and NGC 6240 imply that this ratio might not be a perfect diagnostic tool between active galactic nucleus and starburst environments, due to contamination/combination of both processes. The low HC3N/HCN line ratios with less than 0.15 in NGC 4258, NGC 6240 and the non-detection of HC3N line in NGC 3079 and VII Zw 31 indicate that these four galaxies are HC3N-poor galaxies. The variation of fractional abundance of CN in different types of galaxies is large.
Keywordgalaxies: active galaxies: individual: NGC 3079, NGC 4258, NGC 6240, VII Zw 31 galaxies: ISM
DOI10.1093/mnras/sty2880
WOS KeywordDENSE MOLECULAR GAS ; LUMINOUS INFRARED GALAXIES ; ACTIVE GALACTIC NUCLEUS ; STAR-FORMATION ; HCN ; SUBMILLIMETER ; SEYFERT ; SPECTROSCOPY ; STARBURSTS ; EMISSION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000462327300036
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24216
Collection中国科学院紫金山天文台
Corresponding AuthorLi, Fei; Wang, Junzhi; Kong, Minzhi
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.Hebei Normal Univ, 20 Rd East 2nd Ring South, Shijiazhuang 050024, Hebei, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
5.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
Recommended Citation
GB/T 7714
Li, Fei,Wang, Junzhi,Kong, Minzhi,et al. Millimetre line observations towards four local galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,482(4):4763-4776.
APA Li, Fei,Wang, Junzhi,Kong, Minzhi,&Li, Shanghuo.(2019).Millimetre line observations towards four local galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,482(4),4763-4776.
MLA Li, Fei,et al."Millimetre line observations towards four local galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 482.4(2019):4763-4776.
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