SDSS-IV MaNGA: spatially resolved star formation histories in galaxies as a function of galaxy mass and type

	SDSS-IV MaNGA: spatially resolved star formation histories in galaxies as a function of galaxy mass and type
	Goddard, D.1; Thomas, D.1; Maraston, C.1; Westfall, K.1; Etherington, J.1; Riffel, R.2,3; Mallmann, N. D.2,3; Zheng, Z.4 ; Argudo-Fernandez, M.5; Lian, J.1
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2017-05-01
卷号	466 期号:4 页码:4731-4758
关键词	galaxies: elliptical and lenticular cD galaxies: evolution galaxies: formation galaxies: spiral galaxies: star formation galaxies: stellar content
英文摘要	We study the internal gradients of stellar population propertieswithin 1.5 R-e for a representative sample of 721 galaxies, with stellar masses ranging between 10(9)M circle dot and 10(11.5)M circle dot from the SDSS-IV MaNGA Integral-Field-Unit survey. Through the use of our full spectral fitting code FIREFLY, we derive light-and mass-weighted stellar population properties and their radial gradients, as well as full star formation and metal enrichment histories. We also quantify the impact that different stellar population models and full spectral fitting routines have on the derived stellar population properties and the radial gradient measurements. In our analysis, we find that age gradients tend to be shallow for both early-type and late-type galaxies. Mass-weighted age gradients of early-types arepositive (similar to 0.09 dex/Re) pointing to ` outsidein' progression of star formation, while late-type galaxies have negative light-weighted age gradients (similar to-0.11 dex/R-e), suggesting an ` inside-out' formation of discs. We detect negative metallicity gradients in both early-and late-type galaxies, but these are significantly steeper in late-types, suggesting that the radial dependence of chemical enrichment processes and the effect of gas inflow and metal transport are far more pronounced in discs. Metallicity gradients of both morphological classes correlate with galaxy mass, with negative metallicity gradients becoming steeper with increasing galaxy mass. The correlation with mass is stronger for late-type galaxies, with a slope of d(del[Z/H])/d(logM) similar to -0.2 +/- 0.05, compared to d(del[Z/H])/d(logM) similar to -0.05 +/- 0.05 for early-types. This result suggests that the merger history plays a relatively small role in shaping metallicity gradients of galaxies.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	STELLAR POPULATION GRADIENTS ; DIGITAL SKY SURVEY ; INTEGRAL-FIELD SPECTROGRAPH ; INSIDE-OUT GROWTH ; 2.5 M TELESCOPE ; ELLIPTIC GALAXIES ; METALLICITY GRADIENTS ; SPIRAL GALAXIES ; CALIFA SURVEY ; COMA CLUSTER
收录类别	SCI
语种	英语
WOS记录号	WOS:000402849400070
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8793]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Univ Portsmouth, Inst Cosmol & Gravitat, Burnaby Rd, Portsmouth PO1 3FX, Hants, England 2.Univ Fed Rio Grande do Sul, Inst Fis, Campus Vale,CP 15051, BR-91501970 Porto Alegre, RS, Brazil 3.Lab Interinstituc E Astron, Rua Gen Jose Cristino,77 Vasco da Gama, BR-20921400 Rio De Janeiro, Brazil 4.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China 5.Univ Antofagasta, Fac Cs Basicas, Unidad Astron, Avda Univ Antofagasta, Antofagasta 02800, Chile 6.Univ Wisconsin, Dept Astron, 475 N Charter St, Madison, WI 53706 USA 7.Univ Tokyo, Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan 8.Univ Texas Austin, Dept Astron, McDonald Observ, 1 Univ Stn, Austin, TX 78712 USA 9.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA 10.Univ Kentucky, Dept Phys & Astron, 505 Rose St, Lexington, KY 40506 USA
推荐引用方式 GB/T 7714	Goddard, D.,Thomas, D.,Maraston, C.,et al. SDSS-IV MaNGA: spatially resolved star formation histories in galaxies as a function of galaxy mass and type[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,466(4):4731-4758.
APA	Goddard, D..,Thomas, D..,Maraston, C..,Westfall, K..,Etherington, J..,...&Schneider, D. P..(2017).SDSS-IV MaNGA: spatially resolved star formation histories in galaxies as a function of galaxy mass and type.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,466(4),4731-4758.
MLA	Goddard, D.,et al."SDSS-IV MaNGA: spatially resolved star formation histories in galaxies as a function of galaxy mass and type".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 466.4(2017):4731-4758.