The evolution of interacting spiral galaxy NGC 5194

	The evolution of interacting spiral galaxy NGC 5194
	Kang, Xiaoyu 1,2,3; Chang, Ruixiang4 ; Zhang, Fenghui 1,2; Cheng, Liantao 1,2,3; Wang, Lang 1,2,3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2015-05-01
卷号	449 期号:1 页码:414-424
关键词	galaxies: abundance galaxies: evolution galaxies: individual: M51a galaxies: photometry galaxies: spiral
英文摘要	NGC 5194 (M51a) is a grand-design spiral galaxy and undergoing interactions with its companion. Here, we focus on investigating main properties of its star formation history (SFH) by constructing a simple evolution model, which assumes that the disc builds up gradually by cold gas infall and the gas infall rate can be parameterizedly described by a Gaussian form. By comparing model predictions with the observed data, we discuss the probable range for free parameter in the model and then know more about the main properties of the evolution and SFH of M51a. We find that the model predictions are very sensitive to the free parameter and the model adopting a constant infall-peak time t(p) = 7.0 Gyr can reproduce most of the observed constraints of M51a. Although our model does not assume the gas infall time-scale of the inner disc is shorter than that of the outer disc, our model predictions still show that the disc of M51a forms inside-out. We find that the mean stellar age of M51a is younger than that of the Milky Way, but older than that of the gas-rich disc galaxy UGC 8802. In this paper, we also introduce a 'toy' model to allow an additional cold gas infall occurred recently to imitate the influence of the interaction between M51a and its companion. Our results show that the current molecular gas surface density, the star formation rate and the UV-band surface brightness are important quantities to trace the effects of recent interaction on galactic star formation process.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	STAR-FORMATION HISTORY ; HUBBLE-SPACE-TELESCOPE ; (CO)-C-12 2-1 MAP ; NEARBY GALAXIES ; CHEMICAL EVOLUTION ; FORMATION LAW ; ABUNDANCE GRADIENTS ; RADIAL-DISTRIBUTION ; WHIRLPOOL GALAXY ; GALACTIC DISK
收录类别	SCI
语种	英语
WOS记录号	WOS:000355345600030
公开日期	2015-08-18
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18350]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China 2.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Kang, Xiaoyu,Chang, Ruixiang,Zhang, Fenghui,et al. The evolution of interacting spiral galaxy NGC 5194[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,449(1):414-424.
APA	Kang, Xiaoyu,Chang, Ruixiang,Zhang, Fenghui,Cheng, Liantao,&Wang, Lang.(2015).The evolution of interacting spiral galaxy NGC 5194.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,449(1),414-424.
MLA	Kang, Xiaoyu,et al."The evolution of interacting spiral galaxy NGC 5194".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 449.1(2015):414-424.