SDSS-IV MaNGA: Variation of the Stellar Initial Mass Function in Spiral and Early-type Galaxies

Hongyu Li; Junqiang Ge; Shude Mao; Michele Cappellari; R. J. Long; Ran Li; Eric Emsellem; Aaron A. Dutton; Cheng Li; Kevin Bundy; Daniel Thomas; Niv Drory; Alexandre Roman Lopes

doi:10.3847/1538-4357/aa662a

SDSS-IV MaNGA: Variation of the Stellar Initial Mass Function in Spiral and Early-type Galaxies

Hongyu Li, Junqiang Ge, Shude Mao, Michele Cappellari, R. J. Long, Ran Li, Eric Emsellem, Aaron A. Dutton, Cheng Li, Kevin Bundy, Daniel Thomas, Niv Drory, Alexandre Roman Lopes

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Abstract

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 ATLAS_3D 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.

Original language	English
Article number	77
Journal	Astrophysical Journal
Volume	838
Issue number	2
Early online date	29 Mar 2017
DOIs	https://doi.org/10.3847/1538-4357/aa662a
Publication status	Published - 2017

Keywords

dark matter
galaxies: evolution
galaxies: formation
galaxies: kinematics and dynamics
galaxies: structure

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Li_2017_ApJ_838_77Final published version, 3.28 MB

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title = "SDSS-IV MaNGA: Variation of the Stellar Initial Mass Function in Spiral and Early-type Galaxies",

abstract = "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 ATLAS3D 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.",

keywords = "dark matter, galaxies: evolution, galaxies: formation, galaxies: kinematics and dynamics, galaxies: structure",

author = "Hongyu Li and Junqiang Ge and Shude Mao and Michele Cappellari and Long, {R. J.} and Ran Li and Eric Emsellem and Dutton, {Aaron A.} and Cheng Li and Kevin Bundy and Daniel Thomas and Niv Drory and Lopes, {Alexandre Roman}",

year = "2017",

doi = "10.3847/1538-4357/aa662a",

language = "English",

volume = "838",

journal = "Astrophysical Journal",

issn = "0004-637X",

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TY - JOUR

T1 - SDSS-IV MaNGA

T2 - Variation of the Stellar Initial Mass Function in Spiral and Early-type Galaxies

AU - Li, Hongyu

AU - Ge, Junqiang

AU - Mao, Shude

AU - Cappellari, Michele

AU - Long, R. J.

AU - Li, Ran

AU - Emsellem, Eric

AU - Dutton, Aaron A.

AU - Li, Cheng

AU - Bundy, Kevin

AU - Thomas, Daniel

AU - Drory, Niv

AU - Lopes, Alexandre Roman

PY - 2017

Y1 - 2017

N2 - 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 ATLAS3D 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.

AB - 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 ATLAS3D 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.

KW - dark matter

KW - galaxies: evolution

KW - galaxies: formation

KW - galaxies: kinematics and dynamics

KW - galaxies: structure

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U2 - 10.3847/1538-4357/aa662a

DO - 10.3847/1538-4357/aa662a

M3 - Article

AN - SCOPUS:85017327334

SN - 0004-637X

VL - 838

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 77

ER -

SDSS-IV MaNGA: Variation of the Stellar Initial Mass Function in Spiral and Early-type Galaxies

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Keywords

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