Improved selection criteria for H II regions, based on IRAS sources

	Improved selection criteria for H II regions, based on IRAS sources
	Yan, Qing-Zeng; Xu, Ye; Walsh, A. J.; Macquart, J. P.; MacLeod, G. C.; Zhang, Bo; Hancock, P. J.; Chen, Xi; Tang, Zheng-Hong
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018
卷号	476 期号:3 页码:3981-3990
英文摘要	We 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.
语种	英语
WOS记录号	WOS:000430944100075
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/18071]
专题	中国科学院紫金山天文台
推荐引用方式 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.