SDSS-IV MaNGA: stellar initial mass function variation inferred from Bayesian analysis of the integral field spectroscopy of early-type galaxies

doi:10.1093/mnras/stz764

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	SDSS-IV MaNGA: stellar initial mass function variation inferred from Bayesian analysis of the integral field spectroscopy of early-type galaxies
	Zhou, Shuang 1,2; Mo, H. J.1,2,3; Li, Cheng 1,2; Zheng, Zheng 4; Li, Niu 1,2; Du, Cheng 1,2; Mao, Shude 1,2,4,5; Parikh, Taniya 6; Lane, Richard R.7,8; Thomas, Daniel 6
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-06-01
卷号	485 期号:4 页码:5256-5275
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/stz764
英文摘要	We analyse the stellar initial mass functions (IMF) of a large sample of early-type galaxies (ETGs) provided by MaNGA (Mapping Nearby Galaxies at Apache Point Observatory). The large number of integral field unit (IFU) spectra of individual galaxies provide high signal-to-noise composite spectra that are essential for constraining IMF and to investigate possible radial gradients of the IMF within individual galaxies. The large sample of ETGs also make it possible to study how the IMF shape depends on various properties of galaxies. We adopt a novel approach to study IMF variations in ETGs, use Bayesian inferences based on full spectrum fitting. The Bayesian method provides a statistically rigorous way to explore potential degeneracy in spectrum fitting and to distinguish different IMFmodels with Bayesian evidence. We find that the IMF slope depends systematically on galaxy velocity dispersion, in that galaxies of higher velocity dispersion prefer amore bottom-heavy IMF, but the dependence is almost entirely due to the change of metallicity, Z, with velocity dispersion. The IMF shape also depends on stellar age, A, but the dependence is completely degenerate with that on metallicity through a combination AZ(-1.42). Using independent age and metallicity estimates we find that the IMF variation is produced by metallicity instead of age. The IMF near the centres of massive ETGs appears more bottom-heavy than that in the outer parts, while a weak opposite trend is seen for low-mass ETGs. Uncertainties produced by star formation history, dust extinction, a-element abundance enhancement, and noise in the spectra are tested.
资助项目	National Key R&D Program of China[2018YFA0404503] ; National Key R&D Program of China[2018YFA0404502] ; National Key R&D Program of China[2018YFA0404501] ; National Key Basic Research Program of China[2015CB857004] ; National Science Foundation of China[11233005] ; National Science Foundation of China[11621303] ; National Science Foundation of China[11522324] ; National Science Foundation of China[11421303] ; National Science Foundation of China[11503065] ; National Science Foundation of China[11673015] ; National Science Foundation of China[11733004] ; National Science Foundation of China[11320101002] ; National Science Foundation of China[11821303] ; National Science Foundation of China[11333003] ; National Science Foundation of China[11390372] ; National Science Foundation of China[11761131004] ; National Science Fundation[AST-1517528] ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; Center for High-Performance Computing at the University of Utah ; Carnegie Institution for Science ; Chilean Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Johns Hopkins University ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Max-Planck-Institut fur Astrophysik (MPA Garching) ; Max-Planck-Institut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University
WOS关键词	EVOLUTIONARY POPULATION SYNTHESIS ; SENSITIVE ABSORPTION FEATURES ; DIGITAL SKY SURVEY ; SYSTEMATIC VARIATION ; ELLIPTIC GALAXIES ; RADIAL GRADIENTS ; STAR-FORMATION ; METALLICITY ; IMF ; MODELS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000474880400060
资助机构	National Key R&D Program of China ; National Key R&D Program of China ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Fundation ; National Science Fundation ; 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 ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Johns Hopkins University ; Johns Hopkins University ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Max-Planck-Institut fur Astrophysik (MPA Garching) ; Max-Planck-Institut fur Astrophysik (MPA Garching) ; Max-Planck-Institut fur Extraterrestrische Physik (MPE) ; Max-Planck-Institut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; National Key R&D Program of China ; National Key R&D Program of China ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Fundation ; National Science Fundation ; 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 ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Johns Hopkins University ; Johns Hopkins University ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Max-Planck-Institut fur Astrophysik (MPA Garching) ; Max-Planck-Institut fur Astrophysik (MPA Garching) ; Max-Planck-Institut fur Extraterrestrische Physik (MPE) ; Max-Planck-Institut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; National Key R&D Program of China ; National Key R&D Program of China ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Fundation ; National Science Fundation ; 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 ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Johns Hopkins University ; Johns Hopkins University ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Max-Planck-Institut fur Astrophysik (MPA Garching) ; Max-Planck-Institut fur Astrophysik (MPA Garching) ; Max-Planck-Institut fur Extraterrestrische Physik (MPE) ; Max-Planck-Institut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; National Key R&D Program of China ; National Key R&D Program of China ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Fundation ; National Science Fundation ; 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 ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Johns Hopkins University ; Johns Hopkins University ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Max-Planck-Institut fur Astrophysik (MPA Garching) ; Max-Planck-Institut fur Astrophysik (MPA Garching) ; Max-Planck-Institut fur Extraterrestrische Physik (MPE) ; Max-Planck-Institut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/27005]
专题	中国科学院国家天文台
通讯作者	Zhou, Shuang
作者单位	1.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 2.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China 3.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 4.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China 5.Univ Manchester, Jodrell Bank Ctr Astrophys, Alan Turing Bldg, Manchester M13 9PL, Lancs, England 6.Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg, Portsmouth PO1 3FX, Hants, England 7.Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile 8.Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile
推荐引用方式 GB/T 7714	Zhou, Shuang,Mo, H. J.,Li, Cheng,et al. SDSS-IV MaNGA: stellar initial mass function variation inferred from Bayesian analysis of the integral field spectroscopy of early-type galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,485(4):5256-5275.
APA	Zhou, Shuang.,Mo, H. J..,Li, Cheng.,Zheng, Zheng.,Li, Niu.,...&Thomas, Daniel.(2019).SDSS-IV MaNGA: stellar initial mass function variation inferred from Bayesian analysis of the integral field spectroscopy of early-type galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,485(4),5256-5275.
MLA	Zhou, Shuang,et al."SDSS-IV MaNGA: stellar initial mass function variation inferred from Bayesian analysis of the integral field spectroscopy of early-type galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 485.4(2019):5256-5275.