NAOC Open IR
Radio recombination line observations at 1.0-1.5GHz with FAST
Zhang, Chuan-Peng1,2; Xu, Jin-Long1,2; Li, Guang-Xing3; Hou, Li-Gang1; Yu, Nai-Ping1,2; Jiang, Peng1,2
2021-10-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume21Issue:8Pages:6
AbstractHII regions made of gas ionized by radiations from young massive stars, are widely distributed in the Milky Way. They are tracers for star formation, and their distributions are correlated with the Galactic spiral structure. Radio recombination lines (RRLs) of hydrogen and other atoms allow for the most precise determination of physical parameters such as temperature and density. However, RRLs at around 1.4 GHz from H II regions are weak and their detections are difficult. As a result, only a limited number of detections have been obtained yet. The 19-beam receiver on board of the Five-hundred-meter Aperture Spherical radio Telescope (FAST) can simultaneously cover 23 RRLs for Hn alpha, Hen alpha, and Cn alpha (n = 164 - 186), respectively. This, combined with its unparalleled collecting area, makes FAST the most powerful telescope to detect weak RRLs. In this pilot survey, we use FAST to observe nine H II regions at L band. We allocate 20 minutes pointing time for each source to achieve a sensitivity of around 9 mK in a velocity resolution of 2.0 kms. In total, 21 RRLs for Hn alpha and Cn alpha at 1.0 - 1.5 GHz have been simultaneously detected with strong emission signals. Overall, the detection rates for the H167 alpha and C167 alpha RRLs are 100%, while that for the He167 alpha RRL is 33.3%. Using hydrogen and helium RRLs, we measure the electron density, electron temperature, and pressure for three H II regions. This pilot survey demonstrates the capability of FAST in RRL measurements, and a statistically meaningful sample with RRL detection, through which knowledge about Galactic spiral structure and evolution can be obtained, is expected in the future.
Keywordtelescopes FAST HII regions radio lines ISM galaxies star formation
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China
DOI10.1088/1674-4527/21/8/209
Language英语
Funding ProjectNational Key R&D Program of China[2018YFE0202900] ; NAOC Nebula Talents Program ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Youth Innovation Promotion Association of CAS ; National Natural Science Foundation of China[11703040] ; National Natural Science Foundation of China[W820301904] ; National Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11933011] ; National Natural Science Foundation of China[11833009]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; NAOC Nebula Talents Program ; NAOC Nebula Talents Program ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS ; Youth Innovation Promotion Association of CAS ; Youth Innovation Promotion Association of CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000711659200001
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/74438
Collection中国科学院国家天文台
Corresponding AuthorZhang, Chuan-Peng
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab FAST, Beijing 100101, Peoples R China
3.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Chuan-Peng,Xu, Jin-Long,Li, Guang-Xing,et al. Radio recombination line observations at 1.0-1.5GHz with FAST[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2021,21(8):6.
APA Zhang, Chuan-Peng,Xu, Jin-Long,Li, Guang-Xing,Hou, Li-Gang,Yu, Nai-Ping,&Jiang, Peng.(2021).Radio recombination line observations at 1.0-1.5GHz with FAST.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,21(8),6.
MLA Zhang, Chuan-Peng,et al."Radio recombination line observations at 1.0-1.5GHz with FAST".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 21.8(2021):6.
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