SDSS-IV MaNGA: Bayesian analysis of the star formation history of low-mass galaxies in the local Universe
Abstract
ABSTRACT We measure the star formation histories (SFHs) of a sample of low-mass galaxies with M* < 109 M⊙ from the SDSS-IV MaNGA survey. The large number of IFU spectra for each galaxy are either combined to reach a high signal to noise ratio or used to investigate spatial variations. We use Bayesian inferences based on full spectrum fitting. Our analysis based on Bayesian evidence ratio indicates a strong preference for a model that allows the presence of an old stellar population, and that an improper model for the SFH can significantly underestimate the old population in these galaxies. The addition of near-infrared photometry to the constraining data can further distinguish between different SFH model families and significantly tighten the constraints on the mass fraction in the old population. On average more than half of the stellar mass in present-day low-mass galaxies formed at least 8 Gyr ago, while about 30 per cent within the past 4 Gyr. Satellite galaxies on average have formed their stellar mass earlier than central galaxies. The radial dependence of the SFH is quite weak. Our results suggest that most of the low-mass galaxies have an early episode of active star formation that produces a large fraction ofmore »
- Authors:
-
- Department of Astronomy, Tsinghua University, Beijing 100084, China
- Department of Astronomy, Tsinghua University, Beijing 100084, China, Department of Astronomy, University of Massachusetts Amherst, MA 01003, USA
- Centro de Astronomía, Universidad de Antofagasta, Avenida Angamos 601, Antofagasta 1270300, Chile
- Department of Astronomy and Space Science, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 143-747, South Korea
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1650399
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 497 Journal Issue: 4; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Zhou, Shuang, Mo, H. J., Li, Cheng, Boquien, Médéric, and Rossi, Graziano. SDSS-IV MaNGA: Bayesian analysis of the star formation history of low-mass galaxies in the local Universe. United Kingdom: N. p., 2020.
Web. doi:10.1093/mnras/staa2337.
Zhou, Shuang, Mo, H. J., Li, Cheng, Boquien, Médéric, & Rossi, Graziano. SDSS-IV MaNGA: Bayesian analysis of the star formation history of low-mass galaxies in the local Universe. United Kingdom. https://doi.org/10.1093/mnras/staa2337
Zhou, Shuang, Mo, H. J., Li, Cheng, Boquien, Médéric, and Rossi, Graziano. Tue .
"SDSS-IV MaNGA: Bayesian analysis of the star formation history of low-mass galaxies in the local Universe". United Kingdom. https://doi.org/10.1093/mnras/staa2337.
@article{osti_1650399,
title = {SDSS-IV MaNGA: Bayesian analysis of the star formation history of low-mass galaxies in the local Universe},
author = {Zhou, Shuang and Mo, H. J. and Li, Cheng and Boquien, Médéric and Rossi, Graziano},
abstractNote = {ABSTRACT We measure the star formation histories (SFHs) of a sample of low-mass galaxies with M* < 109 M⊙ from the SDSS-IV MaNGA survey. The large number of IFU spectra for each galaxy are either combined to reach a high signal to noise ratio or used to investigate spatial variations. We use Bayesian inferences based on full spectrum fitting. Our analysis based on Bayesian evidence ratio indicates a strong preference for a model that allows the presence of an old stellar population, and that an improper model for the SFH can significantly underestimate the old population in these galaxies. The addition of near-infrared photometry to the constraining data can further distinguish between different SFH model families and significantly tighten the constraints on the mass fraction in the old population. On average more than half of the stellar mass in present-day low-mass galaxies formed at least 8 Gyr ago, while about 30 per cent within the past 4 Gyr. Satellite galaxies on average have formed their stellar mass earlier than central galaxies. The radial dependence of the SFH is quite weak. Our results suggest that most of the low-mass galaxies have an early episode of active star formation that produces a large fraction of their present stellar mass.},
doi = {10.1093/mnras/staa2337},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 497,
place = {United Kingdom},
year = {Tue Aug 11 00:00:00 EDT 2020},
month = {Tue Aug 11 00:00:00 EDT 2020}
}
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