SDSS-IV MaNGA: Environmental Dependence of the Mgb/– Relation for Nearby Galaxies

doi:10.3847/1538-4357/ab03d2

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	SDSS-IV MaNGA: Environmental Dependence of the Mgb/– Relation for Nearby Galaxies
	Zheng,Zheng 12,13; Li,Cheng 11; Mao,Shude 11,13; Wang,Huiyuan 10; Liu,Chao 13; Mo,Houjun 9,11; Yuan,Zhen 8; Maraston,Claudia 7; Thomas,Daniel 7; Yan,Renbin 6
刊名	The Astrophysical Journal
	2019-03-05
卷号	873 期号:1
关键词	galaxies: abundances galaxies: evolution galaxies: general galaxies: statistics galaxies: stellar content galaxies: structure
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab03d2
英文摘要	Abstract We use a sample of ～3000 galaxies from the MaNGA MPL-7 internal data release to study the α abundance distribution within low-redshift galaxies. We use the Lick index ratio Mgb/ as an α abundance indicator to study relationships between the α abundance distribution and galaxy properties such as effective stellar velocity dispersion within 0.3 effective radii (σ), galaxy environment, and dark matter halo formation time (zf). We find that (1) all galaxies show a tight correlation between Mgb/ and (2) “old” (Hβ < 3) low-σ galaxies in high local density environment and inner regions within galaxy groups are enhanced in Mgb/ , while “young” (Hβ > 3) galaxies and high-mass galaxies show no or less environmental dependence; (3) “old” galaxies with high-zf show enhanced Mgb/ over low- and medium-zf; and (4) Mgb/ gradients are close to zero and show dependence on σ* but no obvious dependence on the environment or zf. Our study indicates that stellar velocity dispersion or galaxy mass is the main parameter driving the Mgb/ enhancement, although environments appear to have modest effects, particularly for low- and medium-mass galaxies.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-873-1-AB03D2
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/30921]
专题	中国科学院国家天文台
作者单位	1.Instituto Milenio de Astrofísica, Av. Vicu?a Mackenna 4860, Macul, Santiago, Chile 2.Instituto de Astronomía, Universidad Católica del Norte, Av. Angamos 0610, Antofagasta, Chile 3.Apache Point Observatory and New Mexico State University, P.O. Box 59, Sunspot, NM 88349-0059, USA 4.Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, UK 5.Department of Astronomy and Astrophysics, University of California, 1156 High Street, Santa Cruz, CA 95064, USA 6.University of Kentucky, Lexington, KY 40506, USA 7.Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX, UK 8.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People's Republic of China 9.Department of Astronomy, University of Massachusetts Amherst, MA 01003, USA 10.Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
推荐引用方式 GB/T 7714	Zheng,Zheng,Li,Cheng,Mao,Shude,et al. SDSS-IV MaNGA: Environmental Dependence of the Mgb/– Relation for Nearby Galaxies[J]. The Astrophysical Journal,2019,873(1).
APA	Zheng,Zheng.,Li,Cheng.,Mao,Shude.,Wang,Huiyuan.,Liu,Chao.,...&Lacerna,Ivan.(2019).SDSS-IV MaNGA: Environmental Dependence of the Mgb/– Relation for Nearby Galaxies.The Astrophysical Journal,873(1).
MLA	Zheng,Zheng,et al."SDSS-IV MaNGA: Environmental Dependence of the Mgb/– Relation for Nearby Galaxies".The Astrophysical Journal 873.1(2019).