The H I-dominated low-surface-brightness galaxy KKR 17

	The H I-dominated low-surface-brightness galaxy KKR 17
	Lam, M. I.1,2,3; Wu, H.1,3 ; Yang, M.1,3 ; Zhou, Z-M 1,3; Du, W.1,3; Zhu, Y-N 1,3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2015-02-01
卷号	446 期号:4 页码:4291-4300
关键词	galaxies: abundances galaxies: evolution galaxies: individual (KKR 17) galaxies: irregular
英文摘要	We present new narrow-band (H alpha and [O III]) images and optical spectrophotometry of H II regions for a gas-rich low-surface-brightness irregular galaxy, KKR 17. The central surface brightness of the galaxy is mu(0)(B) = 24.15 +/- 0.03 mag s(-2). The galaxy was detected by the Arecibo Legacy Fast ALFA survey (ALFALFA). Its mass is dominated by neutral hydrogen (H I) gas. In contrast, both the stellar masses of the bright H II and diffuse stellar regions are small. In addition, the fit to the spectral energy distribution to each region shows the stellar populations of H II and diffuse regions are different. The bright H II region contains a large fraction of O-type stars, revealing recent strong star formation, whereas the diffuse region is dominated by median age stars with a typical age of similar to 600 Myr. Using McGaugh's abundance model, we found that the average metallicity of KKR 17 is 12 + (O/H) = 8.0 +/- 0.1. The star-formation rate of KKR 17 is 0.21 +/- 0.04 M-circle dot yr(-1), which is similar to 1/5 of our Milky Way's. Based on the analysis results for young stellar clusters in the H II region, the bright H II region has two sub-components with different velocities and metallicities. This may be caused by the outflow of massive stars or merging events. However, the mechanism triggering star formation in the H II region is still uncertain.
收录类别	SCI
语种	英语
WOS记录号	WOS:000350272400083
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5716]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Lam, M. I.,Wu, H.,Yang, M.,et al. The H I-dominated low-surface-brightness galaxy KKR 17[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,446(4):4291-4300.
APA	Lam, M. I.,Wu, H.,Yang, M.,Zhou, Z-M,Du, W.,&Zhu, Y-N.(2015).The H I-dominated low-surface-brightness galaxy KKR 17.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,446(4),4291-4300.
MLA	Lam, M. I.,et al."The H I-dominated low-surface-brightness galaxy KKR 17".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 446.4(2015):4291-4300.