SDSS-IV MaNGA: the spatially resolved stellar initial mass function in similar to 400 early-type galaxies

doi:10.1093/mnras/sty785

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	SDSS-IV MaNGA: the spatially resolved stellar initial mass function in similar to 400 early-type galaxies
	Parikh, Taniya 11; Thomas, Daniel 11; Maraston, Claudia 11; Westfall, Kyle B.12; Goddard, Daniel 11; Lian, Jianhui 11; Meneses-Goytia, Sofia 11; Jones, Amy 13; Vaughan, Sam 14; Andrews, Brett H.15
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018-07-01
卷号	477 期号:3 页码:3954-3982
关键词	galaxies: elliptical and lenticular, cD galaxies: evolution galaxies: formation galaxies: fundamental parameters galaxies: stellar content
ISSN号	0035-8711
DOI	10.1093/mnras/sty785
英文摘要	Mapping Nearby Galaxies at Apache Point Observatory provides the opportunity to make precise spatially resolved measurements of the IMF slope in galaxies owing to its unique combination of spatial resolution, wavelength coverage, and sample size. We derive radial gradients in age, element abundances, and IMF slope analysing optical and near-infrared absorption features from stacked spectra out to the half-light radius of 366 early-type galaxies with masses 9.9-10.8 logM/M-circle dot. We find flat gradients in age and [alpha/Fe] ratio, as well as negative gradients in metallicity, consistent with the literature. We further derive significant negative gradients in the [Na/Fe] ratio with galaxy centres being well enhanced in Na abundance by up to 0.5 dex. Finally, we find a gradient in IMF slope with a bottom-heavy IMF in the centre (typical mass excess factor of 1.5) and a Milky Way-type IMF at the half-light radius. This pattern is mass dependent with the lowest mass galaxies in our sample featuring only a shallow gradient around a Milky Way IMF. Our results imply the local IMF-sigma relation within galaxies to be even steeper than the global relation and hint towards the local metallicity being the dominating factor behind the IMF variations. We also employ different stellar population models in our analysis and show that a radial IMF gradient is found independently of the stellar population model used. A similar analysis of the Wing-Ford band provides inconsistent results and further evidence of the difficulty in measuring and modelling this particular feature.
资助项目	University of Portsmouth PhD bursary ; Consolidated Grant Cosmology and Astrophysics at Portsmouth[ST/N000668/1] ; Institute of Cosmology of Gravitation, South East Physics Network ; University of Portsmouth ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah
WOS关键词	DIGITAL SKY SURVEY ; SENSITIVE ABSORPTION FEATURES ; ELEMENT ABUNDANCE RATIOS ; POPULATION-MODELS ; ELLIPTIC GALAXIES ; GLOBULAR-CLUSTERS ; LINE INDEXES ; LICK INDEXES ; COMA CLUSTER ; MORPHOLOGICAL CLASSIFICATIONS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000433893700080
资助机构	University of Portsmouth PhD bursary ; University of Portsmouth PhD bursary ; Consolidated Grant Cosmology and Astrophysics at Portsmouth ; Consolidated Grant Cosmology and Astrophysics at Portsmouth ; Institute of Cosmology of Gravitation, South East Physics Network ; Institute of Cosmology of Gravitation, South East Physics Network ; University of Portsmouth ; University of Portsmouth ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; University of Portsmouth PhD bursary ; University of Portsmouth PhD bursary ; Consolidated Grant Cosmology and Astrophysics at Portsmouth ; Consolidated Grant Cosmology and Astrophysics at Portsmouth ; Institute of Cosmology of Gravitation, South East Physics Network ; Institute of Cosmology of Gravitation, South East Physics Network ; University of Portsmouth ; University of Portsmouth ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; University of Portsmouth PhD bursary ; University of Portsmouth PhD bursary ; Consolidated Grant Cosmology and Astrophysics at Portsmouth ; Consolidated Grant Cosmology and Astrophysics at Portsmouth ; Institute of Cosmology of Gravitation, South East Physics Network ; Institute of Cosmology of Gravitation, South East Physics Network ; University of Portsmouth ; University of Portsmouth ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; University of Portsmouth PhD bursary ; University of Portsmouth PhD bursary ; Consolidated Grant Cosmology and Astrophysics at Portsmouth ; Consolidated Grant Cosmology and Astrophysics at Portsmouth ; Institute of Cosmology of Gravitation, South East Physics Network ; Institute of Cosmology of Gravitation, South East Physics Network ; University of Portsmouth ; University of Portsmouth ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/21621]
专题	中国科学院国家天文台
通讯作者	Parikh, Taniya
作者单位	1.Univ Wisconsin, Dept Astron, 475N Charter St, Madison, WI 53703 USA 2.Apache Point Observ, POB 59, Sunspot, NM 88349 USA 3.Univ Utah, Dept Phys & Astron, 115 S 1400 E, Salt Lake City, UT 84112 USA 4.Univ Texas Austin, McDonald Observ, 1 Univ Stn, Austin, TX 78712 USA 5.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany 6.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA 7.Univ La Serena, Dept Fis, Fac Ciencias, La Serena 1200, Chile 8.Univ Kentucky, Dept Phys & Astron, 505 Rose St, Lexington, KY 40506 USA 9.Univ North Carolina Asheville, Dept Phys, One Univ Hts, Asheville, NC 28804 USA 10.Chinese Acad Sci, Natl Astron Observ China, 20A Datun Rd, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Parikh, Taniya,Thomas, Daniel,Maraston, Claudia,et al. SDSS-IV MaNGA: the spatially resolved stellar initial mass function in similar to 400 early-type galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,477(3):3954-3982.
APA	Parikh, Taniya.,Thomas, Daniel.,Maraston, Claudia.,Westfall, Kyle B..,Goddard, Daniel.,...&Zheng, Zheng.(2018).SDSS-IV MaNGA: the spatially resolved stellar initial mass function in similar to 400 early-type galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,477(3),3954-3982.
MLA	Parikh, Taniya,et al."SDSS-IV MaNGA: the spatially resolved stellar initial mass function in similar to 400 early-type galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 477.3(2018):3954-3982.