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Improved selection criteria for H II regions, based on IRAS sources
Yan, Qing-Zeng1,2,3,4; Xu, Ye2; Walsh, A. J.3; Macquart, J. P.3; MacLeod, G. C.5; Zhang, Bo1; Hancock, P. J.3; Chen, Xi1,6; Tang, Zheng-Hong1,7
2018-05-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume476Issue:3Pages:3981-3990
Corresponding AuthorYan, Qing-Zeng(qzyan@shao.ac.cn) ; Xu, Ye(xuye@pmo.ac.cn) ; Chen, Xi(chenxi@shao.ac.cn)
AbstractWe present new criteria for selecting HII regions from the Infrared Astronomical Satellite (IRAS) Point Source Catalogue (PSC), based on an HII region catalogue derived manually from the all-sky Wide-field Infrared Survey Explorer (WISE). The criteria are used to augment the number of HII region candidates in theMilkyWay. The criteria are defined by the linear decision boundary of two samples: IRAS point sources associated with known HII regions, which serve as the HII region sample, and IRAS point sources at high Galactic latitudes, which serve as the non-H II region sample. Amachine learning classifier, specifically a support vector machine, is used to determine the decision boundary. We investigate all combinations of four IRAS bands and suggest that the optimal criterion is log (F-60/F-12) >= (-0.19 x log (F-100/F-25) + 1.52), with detections at 60 and 100 mu m. This selects 3041 HII region candidates from the IRAS PSC. We find that IRAS HII region candidates show evidence of evolution on the two-colour diagram. Merging the WISE HII catalogue with IRAS HII region candidates, we estimate a lower limit of approximately 10 200 for the number of HII regions in the Milky Way.
Keywordstars: evolution stars: massive stars: statistics HII regions infrared: ISM infrared: stars
DOI10.1093/mnras/sty518
WOS KeywordMASSIVE STAR-FORMATION ; METHANOL MASER SURVEY ; RADIO IMAGING SURVEY ; MOLECULAR CLOUDS ; INFRARED SURVEY ; SOURCE CATALOG ; SOUTHERN SKY ; HII-REGIONS ; DUST ; CONTINUUM
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000430944100075
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22019
Collection中国科学院紫金山天文台
Corresponding AuthorYan, Qing-Zeng; Xu, Ye; Chen, Xi
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Curtin Univ, Int Ctr Radio Astron Res, GPO Box U1987, Perth, WA 6845 USA
4.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100049, Peoples R China
5.Hartebeesthoek Radio Astron Observ, POB 443, ZA-1740 Krugersdorp, South Africa
6.GuangZhou Univ, Ctr Astrophys, Guangzhou 510006, Guangdong, Peoples R China
7.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquanlu, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Yan, Qing-Zeng,Xu, Ye,Walsh, A. J.,et al. Improved selection criteria for H II regions, based on IRAS sources[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,476(3):3981-3990.
APA Yan, Qing-Zeng.,Xu, Ye.,Walsh, A. J..,Macquart, J. P..,MacLeod, G. C..,...&Tang, Zheng-Hong.(2018).Improved selection criteria for H II regions, based on IRAS sources.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,476(3),3981-3990.
MLA Yan, Qing-Zeng,et al."Improved selection criteria for H II regions, based on IRAS sources".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 476.3(2018):3981-3990.
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