Stellar kinematics and populations out to 1.5 effective radii in the elliptical galaxy NGC 4636

	Stellar kinematics and populations out to 1.5 effective radii in the elliptical galaxy NGC 4636
	Pu SB(浦仕毕)1,2,3 ; Han ZW(韩占文)1,3
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2011-08
卷号	11 期号:8 页码:909-923
关键词	galaxy: elliptical and lenticular galaxy: abundances galaxy: kinematic and dynamics galaxy: individual (NGC 4636)
ISSN号	1674-4527
通讯作者	Pu, SB (reprint author), Chinese Acad Sci, Natl Astron Observ Yunnan Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	We present high quality long slit spectra along the major and minor axes out to 1.5 effective radii of the massive galaxy NGC 4636 taken by the Hobby-Eberly Telescope. Using the Fourier Correlation Quotient method, we measured the stellar line-of-sight velocity distribution along the axes. Furthermore, six Lick/IDS indices (H beta, mgb, Fe-5015, Fe-5270, Fe-5335, Fe-5406) are derived from the clean spectrum. By comparing the measured absorption line strengths with the predictions of Simple Stellar Population (SSP) models, we derived ages, total metallicity and alpha abundance profiles of the galaxy. This galaxy presents old and [alpha/Fe] overabundant stellar populations. Indeed, using the SSP model, we obtained the broadband color profiles. The theoretical colors match well with the measured colors and present red sharp peaks at the galaxy center. The sharp peaks of the colors are mainly shaped by the high metallicity in the galaxy's center. Interestingly, the galaxy has steep negative metallicity gradients, but the trend flattens outwards. This result likely suggests that the center and outer regions of the galaxy formed through different formation processes.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GLOBULAR-CLUSTER SYSTEM ; DYNAMICALLY HOT GALAXIES ; LINE-STRENGTH GRADIENTS ; DARK-MATTER ; LUMINOSITY FUNCTIONS ; SURFACE PHOTOMETRY ; FORMATION HISTORY ; ABUNDANCE RATIOS ; RED-SEQUENCE ; IONIZED-GAS
收录类别	SCI
原文出处	http://arxiv.org/abs/1104.4845
语种	英语
WOS记录号	WOS:000294232800005
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4513]
专题	云南天文台_大样本恒星演化研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatory/Yunnan Observatory, the Chinese Academy of Sciences, 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences,
推荐引用方式 GB/T 7714	Pu SB,Han ZW. Stellar kinematics and populations out to 1.5 effective radii in the elliptical galaxy NGC 4636[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(8):909-923.
APA	Pu SB,&Han ZW.(2011).Stellar kinematics and populations out to 1.5 effective radii in the elliptical galaxy NGC 4636.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(8),909-923.
MLA	Pu SB,et al."Stellar kinematics and populations out to 1.5 effective radii in the elliptical galaxy NGC 4636".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.8(2011):909-923.