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Ionized gas clouds near the Sagittarius Arm tangent
Hou, Li-Gang1; Dong, Jian2; Gao, Xu-Yang1; Han, Jin-Lin1
2017-05-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume17Issue:5
AbstractRadio recombination lines (RRLs) are the best tracers of ionized gas. Simultaneous observations of multi-transitions of RRLs can significantly improve survey sensitivity. We conducted pilot RRL observations near the Sagittarius Arm tangent by using the 65-m Shanghai Tian Ma Radio Telescope (TMRT) equipped with broadband feeds and a digital backend. Six hydrogen RRLs (H96 alpha-H101 alpha) at C band (6289MHz-7319MHz) were observed simultaneously toward a sky area of 2. x 1.2. by using on-the-fly mapping mode. These transitions were then stacked together for detection of ionized gas. Star forming complexes G48.6+0.1 and G49.5-0.3 were detected in the integrated intensity map. We found agreements between our measured centroid velocities and previous results for the 21 known HII regions in the mapped area. For more than 80 cataloged HII region candidates without previous RRL measurements, we obtained new RRL spectra at 30 targeted positions. In addition, we detected 25 new discrete RRL sources with spectral S/N > 5 sigma, and they were not listed in the catalogs of previously known HII regions. The distances for 44 out of these 55 new RRL sources were estimated.
SubtypeArticle
KeywordGalaxy: Disk Radio Lines: Ism Ism: Hii Regions
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Natural Science Foundation of China(11303035 ; National Natural Science Foundation of China(11303035 ; Key Research Program of the Chinese Academy of Sciences(QYZDJSSW-SLH021) ; Key Research Program of the Chinese Academy of Sciences(QYZDJSSW-SLH021) ; FAST Fellowship ; FAST Fellowship ; Young Researchers Grant of National Astronomical Observatories, Chinese Academy of Sciences ; Young Researchers Grant of National Astronomical Observatories, Chinese Academy of Sciences ; Special Funding for Advanced users, budgeted ; Special Funding for Advanced users, budgeted ; 11473034 ; 11473034 ; 11503033 ; 11503033 ; 11503070) ; 11503070) ; National Natural Science Foundation of China(11303035 ; National Natural Science Foundation of China(11303035 ; Key Research Program of the Chinese Academy of Sciences(QYZDJSSW-SLH021) ; Key Research Program of the Chinese Academy of Sciences(QYZDJSSW-SLH021) ; FAST Fellowship ; FAST Fellowship ; Young Researchers Grant of National Astronomical Observatories, Chinese Academy of Sciences ; Young Researchers Grant of National Astronomical Observatories, Chinese Academy of Sciences ; Special Funding for Advanced users, budgeted ; Special Funding for Advanced users, budgeted ; 11473034 ; 11473034 ; 11503033 ; 11503033 ; 11503070) ; 11503070)
DOI10.1088/1674-4527/17/5/47
WOS KeywordH-II REGIONS ; RADIO RECOMBINATION LINES ; GALACTIC PLANE SURVEY ; STAR-FORMATION REGIONS ; MILKY-WAY ; SPIRAL STRUCTURE ; TRIGONOMETRIC PARALLAXES ; DISTANCE AMBIGUITIES ; SPATIAL-DISTRIBUTION ; H166-ALPHA EMISSION
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China(11303035 ; National Natural Science Foundation of China(11303035 ; Key Research Program of the Chinese Academy of Sciences(QYZDJSSW-SLH021) ; Key Research Program of the Chinese Academy of Sciences(QYZDJSSW-SLH021) ; FAST Fellowship ; FAST Fellowship ; Young Researchers Grant of National Astronomical Observatories, Chinese Academy of Sciences ; Young Researchers Grant of National Astronomical Observatories, Chinese Academy of Sciences ; Special Funding for Advanced users, budgeted ; Special Funding for Advanced users, budgeted ; 11473034 ; 11473034 ; 11503033 ; 11503033 ; 11503070) ; 11503070) ; National Natural Science Foundation of China(11303035 ; National Natural Science Foundation of China(11303035 ; Key Research Program of the Chinese Academy of Sciences(QYZDJSSW-SLH021) ; Key Research Program of the Chinese Academy of Sciences(QYZDJSSW-SLH021) ; FAST Fellowship ; FAST Fellowship ; Young Researchers Grant of National Astronomical Observatories, Chinese Academy of Sciences ; Young Researchers Grant of National Astronomical Observatories, Chinese Academy of Sciences ; Special Funding for Advanced users, budgeted ; Special Funding for Advanced users, budgeted ; 11473034 ; 11473034 ; 11503033 ; 11503033 ; 11503070) ; 11503070)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000405574100008
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8861
Collection射电天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Hou, Li-Gang,Dong, Jian,Gao, Xu-Yang,et al. Ionized gas clouds near the Sagittarius Arm tangent[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(5).
APA Hou, Li-Gang,Dong, Jian,Gao, Xu-Yang,&Han, Jin-Lin.(2017).Ionized gas clouds near the Sagittarius Arm tangent.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(5).
MLA Hou, Li-Gang,et al."Ionized gas clouds near the Sagittarius Arm tangent".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.5(2017).
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