Radially extended kinematics and stellar populations of the massive ellipticals NGC1600, NGC4125, and NGC7619 Constraints on the outer dark halo density profile

doi:10.1051/0004-6361/201014395

YNAO OpenIR > 大样本恒星演化研究组

	Radially extended kinematics and stellar populations of the massive ellipticals NGC1600, NGC4125, and NGC7619 Constraints on the outer dark halo density profile
	Pu SB(浦仕毕)1,2,3 ; Saglia, RP 3,4; Fabricius, MH 3,4; Thomas, J 3,4; Bender, R 3,4; Han ZW(韩占文)1,5 ; Pu, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
发表期刊	ASTRONOMY & ASTROPHYSICS
	2010-06
卷号	516
DOI	10.1051/0004-6361/201014395
产权排序	第1完成单位
收录类别	SCI ; EI
关键词	Galaxy: Abundances Galaxies: Elliptical And Lenticular Galaxies: Kinematics And Dynamics Cd Galaxies: Individual: Ngc4125 Galaxies: Individual: Ngc7619 Galaxies: Individual: Ngc1600
摘要	We present high quality long slit spectra along the major and minor axes out to 1.5-2 R(e) (14-22 kpc) of three bright elliptical galaxies (NGC 1600, NGC 4125, NGC 7619) obtained at the Hobby-Eberly Telescope (HET). We derive stellar kinematic profiles and Lick/IDS indices (H beta, Mgb, Fe(5015), Fe(5270), Fe(5335), Fe(5406)). Moreover, for NGC 4125 we derive gas kinematics and emission line strengths. We model the absorption line strengths using Simple Stellar Populations models that take into account the variation of [alpha/Fe] and derive ages, total metallicity and element abundances. Overall, we find that the three galaxies have old and [alpha/Fe] over-abundant stellar populations with no significant gradients. The metallicity is supersolar at the center with a strong negative radial gradient. For NGC 4125, several pieces of evidence point to a recent dissipational merger event. We calculate the broad band color profiles with the help of SSP models. All of the colors show sharp peaks at the center of the galaxies, mainly caused by the metallicity gradients, and agree well with the measured colors. Using the Schwarzschild's axisymmetric orbit superposition technique, we model the stellar kinematics to constrain the dark halos of the galaxies. We use the tight correlation between the Mgb strength and local escape velocity to set limits on the extent of the halos by testing different halo sizes. Logarithmic halos - cut at 60 kpc - minimize the overall scatter of the Mgb-V(esc) relation. Larger cutoff radii are found if the dark matter density profile is decreasing more steeply at large radii.
项目资助者	Chinese National Science Foundation [10821061] ; National Basic Research Program of China [2007CB815406] ; Chinese Academy of Sciences and Max-Planck-Institut fur extraterrestrische Physik ; Chinese Academy of Sciences [KJCX2-YW-T24]
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-6361
URL	查看原文
归档日期	2010-10-26
WOS记录号	WOS:000280275400019
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	EARLY-TYPE GALAXIES ; STAR-FORMATION HISTORY ; BRIGHTEST CLUSTER GALAXIES ; DYNAMICALLY HOT GALAXIES ; COLOR-MAGNITUDE RELATION ; LINE-STRENGTH GRADIENTS ; FUNDAMENTAL PLANE ; GLOBULAR-CLUSTERS ; SAURON PROJECT ; LENTICULAR GALAXIES
引用统计	被引频次：32[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4498
专题	大样本恒星演化研究组中国科学院天体结构与演化重点实验室
通讯作者	Pu, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
作者单位	1.National Astronomical Observatory/Yunnan Observatory, the Chinese Academy of Sciences, Kunming 650011, PR China 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, PR China 3.Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany 4.Universitätssternwarte, München, Scheinerstrae 1, 81679 München, Germany 5.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, PR China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Pu SB,Saglia, RP,Fabricius, MH,et al. Radially extended kinematics and stellar populations of the massive ellipticals NGC1600, NGC4125, and NGC7619 Constraints on the outer dark halo density profile[J]. ASTRONOMY & ASTROPHYSICS,2010,516.
APA	Pu SB.,Saglia, RP.,Fabricius, MH.,Thomas, J.,Bender, R.,...&Pu, SB .(2010).Radially extended kinematics and stellar populations of the massive ellipticals NGC1600, NGC4125, and NGC7619 Constraints on the outer dark halo density profile.ASTRONOMY & ASTROPHYSICS,516.
MLA	Pu SB,et al."Radially extended kinematics and stellar populations of the massive ellipticals NGC1600, NGC4125, and NGC7619 Constraints on the outer dark halo density profile".ASTRONOMY & ASTROPHYSICS 516(2010).

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