SDSS-IV MaNGA: Stellar M/L gradients and the M/L-colour relation in galaxies
Abstract
The stellar mass-to-light ratio gradient in SDSS r-band ∇(M*/Lr) of a galaxy depends on its mass assembly history, which is imprinted in its morphology and gradients of age, metallicity, and stellar initial mass function (IMF). Taking a MaNGA sample of 2051 galaxies with stellar masses ranging from 109 to 1012M⊙ released in SDSS DR15, we focus on face-on galaxies, without merger and bar signatures, and investigate the dependence of the 2D ∇(M*/Lr) on other galaxy properties, including M*/Lr-colour relationships by assuming a fixed Salpeter IMF as the mass normalization reference. The median gradient is ∇M*/Lr ~ –0.1 (i.e. the M*/Lr is larger at the centre) for massive galaxies, becomes flat around M* ~ 1010M⊙ and change sign to ∇M*/Lr ~ 0.1 at the lowest masses. The M*/Lr inside a half-light radius increases with increasing galaxy stellar mass; in each mass bin, early-type galaxies have the highest value, while pure-disc late-type galaxies have the smallest. Correlation analyses suggest that the mass-weighted stellar age is the dominant parameter influencing the M*/Lr profile, since a luminosity-weighted age is easily affected by star formation when the specific star formation rate (sSFR) inside the half-light radius is higher than 10–3 Gyr–1. With increased sSFR gradient,more »
- Authors:
-
[3];
[4];
[5];
[6]
- Chinese Academy of Sciences (CAS), Beijing (China). National Astronomical Observatories
- Tsinghua Univ., Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China). National Astronomical Observatories
- Chinese Academy of Sciences (CAS), Beijing (China). National Astronomical Observatories; University of Chinese Academy of Sciences, Beijing (China)
- Univ. of Oxford (United Kingdom)
- Tsinghua Univ., Beijing (China); Univ. of Manchester (United Kingdom)
- Univ. of Kentucky, Lexington, KY (United States)
- Publication Date:
- Research Org.:
- US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)
- Sponsoring Org.:
- USDOE Office of Science (SC); Beijing Municipal Natural Science Foundation; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); National Key Program for Science and Technology Research and Development; National Science Foundation (NSF)
- OSTI Identifier:
- 1982525
- Grant/Contract Number:
- 1204038; 2018YFA0404501; 11903046; U1931110; 11333003; 11761131004; 11390372; 2016YFA0400704; AST-1715898
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 507; Journal Issue: 2; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astronomy; Astrophysics; Galaxies; Elliptical and lenticular; CD; Evolution; Formation; Fundamental parameters; Spiral; Star formation
Citation Formats
Ge, Junqiang, Mao, Shude, Lu, Youjun, Cappellari, Michele, Long, Richard J., and Yan, Renbin. SDSS-IV MaNGA: Stellar M/L gradients and the M/L-colour relation in galaxies. United States: N. p., 2021.
Web. doi:10.1093/mnras/stab2341.
Ge, Junqiang, Mao, Shude, Lu, Youjun, Cappellari, Michele, Long, Richard J., & Yan, Renbin. SDSS-IV MaNGA: Stellar M/L gradients and the M/L-colour relation in galaxies. United States. https://doi.org/10.1093/mnras/stab2341
Ge, Junqiang, Mao, Shude, Lu, Youjun, Cappellari, Michele, Long, Richard J., and Yan, Renbin. Fri .
"SDSS-IV MaNGA: Stellar M/L gradients and the M/L-colour relation in galaxies". United States. https://doi.org/10.1093/mnras/stab2341. https://www.osti.gov/servlets/purl/1982525.
@article{osti_1982525,
title = {SDSS-IV MaNGA: Stellar M/L gradients and the M/L-colour relation in galaxies},
author = {Ge, Junqiang and Mao, Shude and Lu, Youjun and Cappellari, Michele and Long, Richard J. and Yan, Renbin},
abstractNote = {The stellar mass-to-light ratio gradient in SDSS r-band ∇(M*/Lr) of a galaxy depends on its mass assembly history, which is imprinted in its morphology and gradients of age, metallicity, and stellar initial mass function (IMF). Taking a MaNGA sample of 2051 galaxies with stellar masses ranging from 109 to 1012M⊙ released in SDSS DR15, we focus on face-on galaxies, without merger and bar signatures, and investigate the dependence of the 2D ∇(M*/Lr) on other galaxy properties, including M*/Lr-colour relationships by assuming a fixed Salpeter IMF as the mass normalization reference. The median gradient is ∇M*/Lr ~ –0.1 (i.e. the M*/Lr is larger at the centre) for massive galaxies, becomes flat around M* ~ 1010M⊙ and change sign to ∇M*/Lr ~ 0.1 at the lowest masses. The M*/Lr inside a half-light radius increases with increasing galaxy stellar mass; in each mass bin, early-type galaxies have the highest value, while pure-disc late-type galaxies have the smallest. Correlation analyses suggest that the mass-weighted stellar age is the dominant parameter influencing the M*/Lr profile, since a luminosity-weighted age is easily affected by star formation when the specific star formation rate (sSFR) inside the half-light radius is higher than 10–3 Gyr–1. With increased sSFR gradient, one can obtain a steeper negative ∇(M*/Lr). The scatter in the slopes of M*/L-colour relations increases with increasing sSFR, for example, the slope for post-starburst galaxies can be flattened to 0.45 from the global value 0.87 in the M*/L versus g – r diagram. Hence converting galaxy colours to M*/L should be done carefully, especially for those galaxies with young luminosity-weighted stellar ages, which can have quite different star formation histories.},
doi = {10.1093/mnras/stab2341},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 507,
place = {United States},
year = {Fri Aug 13 00:00:00 EDT 2021},
month = {Fri Aug 13 00:00:00 EDT 2021}
}
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Improving the full spectrum fitting method: accurate convolution with Gauss–Hermite functions
journal, November 2016
- Cappellari, Michele
- Monthly Notices of the Royal Astronomical Society, Vol. 466, Issue 1