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SDSS-IV MaNGA: Variation of the Stellar Initial Mass Function in Spiral and Early-type Galaxies
Li,Hongyu1,2; Ge,Junqiang1; Mao,Shude1,3,4; Cappellari,Michele5; Long,R. J.1,4; Li,Ran1,6; Emsellem,Eric7,8; Dutton,Aaron A.9; Li,Cheng3,10; Bundy,Kevin11; Thomas,Daniel12; Drory,Niv13; Lopes,Alexandre Roman14
Source PublicationThe Astrophysical Journal
AbstractAbstract We perform Jeans anisotropic modeling (JAM) on elliptical and spiral galaxies from the MaNGA DR13 sample. By comparing the stellar mass-to-light ratios estimated from stellar population synthesis and from JAM, we find a?systematic variation of the initial mass function (IMF) similar to that?in the earlier results. Early-type galaxies (elliptical and lenticular) with lower velocity dispersions within one effective radius are consistent with a Chabrier-like IMF, while galaxies with higher velocity dispersions are consistent with a more bottom-heavy IMF such as the Salpeter IMF. Spiral galaxies have similar systematic IMF variations, but with slightly different slopes and larger scatters, due to the uncertainties caused by the?higher gas fractions and extinctions for these galaxies. Furthermore, we examine the effects of stellar mass-to-light ratio gradients on our JAM modeling, and we?find that the trends become?stronger after considering the gradients.
Keyworddark matter galaxies: evolution galaxies: formation galaxies: kinematics and dynamics galaxies: structure
WOS IDIOP:0004-637X-838-2-aa662a
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Physics Department and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, China
4.Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
5.Sub-Department of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, UK
6.Key laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China
7.Université Lyon 1, Observatoire de Lyon, Centre de Recherche Astrophysique de Lyon and Ecole Normale Supérieure de Lyon, 9 avenue Charles André, F-69230 Saint-Genis Laval, France
8.European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany
9.New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, UAE
10.Shanghai Astronomical Observatory, Shanghai 200030, China
11.Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
12.Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, PO1 3FX, UK
13.McDonald Observatory, The University of Texas at Austin, 1 University Station, Austin, TX 78712, USA
14.Department of Physics and Astronomy, Universidad de La Serena, Cisternas 1200, La Serena, Chile
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li,Hongyu,Ge,Junqiang,Mao,Shude,et al. SDSS-IV MaNGA: Variation of the Stellar Initial Mass Function in Spiral and Early-type Galaxies[J]. The Astrophysical Journal,2017,838(2).
APA Li,Hongyu.,Ge,Junqiang.,Mao,Shude.,Cappellari,Michele.,Long,R. J..,...&Lopes,Alexandre Roman.(2017).SDSS-IV MaNGA: Variation of the Stellar Initial Mass Function in Spiral and Early-type Galaxies.The Astrophysical Journal,838(2).
MLA Li,Hongyu,et al."SDSS-IV MaNGA: Variation of the Stellar Initial Mass Function in Spiral and Early-type Galaxies".The Astrophysical Journal 838.2(2017).
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