NAOC Open IR
Weak CS emission in an extremely metal-poor galaxy DDO 70
Du, Kaiyi1,2; Shi, Yong1,2; Zhang, Zhi-Yu1,2; Wang, Junzhi3; Gao, Yu4,5
2020-07-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume496Issue:1Pages:L38-L42
AbstractIn most galaxies like the Milky Way, stars form in clouds of molecular gas. Unlike the CO emission that traces the bulk of molecular gas, the rotational transitions of HCN and CS molecules mainly probe the dense phase of molecular gas, which has a tight and almost linear relation with the far-infrared luminosity and star formation rate (SFR). However, it is unclear whether dense molecular gas exists at very low metallicity, and if exists, how it is related to star formation. In this work, we report ALMA observations of the CS J = 5 -> 4 emission line of DDO 70, a nearby gas-rich dwarf galaxy with similar to 7 per cent solar metallicity. We did not detect CS emission from all regions with strong CO emission. After stacking all CS spectra from CO-bright clumps, we find no more than a marginal detection of CS J = 5 -> 4 transition, at a signal-to-noise ratio of similar to 3.3. This 3 sigma upper limit deviates from the L'(CS)-L-IR and L'(CS)-SFR relationships found in local star-forming galaxies and dense clumps in the Milky Way, implying weaker CS emission at given infrared luminosity and SFR. We discuss the possible mechanisms that suppress CS emission at low metallicity.
Keywordgalaxies: dwarf galaxies: ISM submillimetre: ISM
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences
DOI10.1093/mnrasl/slaa086
WOS KeywordSTAR-FORMATION RATE ; MOLECULAR GAS ; CO EMISSION ; HCN ; LUMINOSITY ; REGIONS
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFA0402704] ; National Key Research and Development Program of China[2018YFA0404502] ; NationalNatural Science Foundation of China (NSFC)[11825302] ; NationalNatural Science Foundation of China (NSFC)[11733002] ; NationalNatural Science Foundation of China (NSFC)[11773013] ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China[2017YFA0402704] ; National Natural Science Foundation of China[11861131007] ; National Natural Science Foundation of China[U1731237] ; National Natural Science Foundation of China[11420101002] ; Chinese Academy of Sciences Key Research Program of Frontier Sciences[QYZDJSSW-SLH008]
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NationalNatural Science Foundation of China (NSFC) ; NationalNatural Science Foundation of China (NSFC) ; Tencent Foundation through the XPLORER PRIZE ; Tencent Foundation through the XPLORER PRIZE ; National Key Basic Research and Development Program of China ; National Key Basic Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; Chinese Academy of Sciences Key Research Program of Frontier Sciences
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000560791900008
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82222
Collection中国科学院国家天文台
Corresponding AuthorShi, Yong; Zhang, Zhi-Yu
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210093, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
4.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Du, Kaiyi,Shi, Yong,Zhang, Zhi-Yu,et al. Weak CS emission in an extremely metal-poor galaxy DDO 70[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,496(1):L38-L42.
APA Du, Kaiyi,Shi, Yong,Zhang, Zhi-Yu,Wang, Junzhi,&Gao, Yu.(2020).Weak CS emission in an extremely metal-poor galaxy DDO 70.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,496(1),L38-L42.
MLA Du, Kaiyi,et al."Weak CS emission in an extremely metal-poor galaxy DDO 70".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 496.1(2020):L38-L42.
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