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SDSS-IV MaNGA : spatially resolved star formation histories in galaxies as a function of galaxy mass and type

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Date
01/05/2017
Author
Goddard, Daniel
Thomas, Daniel
Maraston, Claudia
Westfall, Kyle B.
Etherington, James
Riffel, Rogerio
Mallmann, Nicolas D.
Zheng, Zheng
Argudo-Fernández, Maria
Lian, Jianhui
Bershady, Matthew A.
Bundy, Kevin
Drory, Niv
Law, David R.
Yan, Renbin
Wake, David
Weijmans, Anne-Marie
Bizyaev, Dmitry
Brownstein, Joel R.
Lane, Richard R.
Maiolino, Roberto
Masters, Karen L.
Merrifield, Michael R.
Nitschelm, Christian
Pan, Kaike
Roman-Lopes, Alexandre
Storchi-Bergmann, Thaisa
Schneider, Donald P.
Keywords
Galaxies: formation
Galaxies: evolution
Galaxies: elliptical and lenticular, cD
Galaxies: spiral
Galaxies: stellar content
Galaxies: star formation
QB Astronomy
QC Physics
DAS
Metadata
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Abstract
We study the internal gradients of stellar population properties within 1.5Re for a representative sample of 721 galaxies with stellar masses ranging between 109M⊙ to 1011.5M⊙ from the SDSS-IV MaNGA IFU survey. Through the use of our full spectral fitting code FIREFLY, we derive light and mass-weighted stellar population properties and their radial gradients, as well as full star formation and metal enrichment histories. We also quantify the impact that different stellar population models and full spectral fitting routines have on the derived stellar population properties, and the radial gradient measurements. In our analysis, we find that age gradients tend to be shallow for both early-type and late-type galaxies. Mass-weighted age gradients of early-types are positive (∼0.09dex/Re) pointing to "outside-in" progression of star formation, while late-type galaxies have negative light-weighted age gradients (∼−0.11dex/Re), suggesting an "inside-out" formation of discs. We detect negative metallicity gradients in both early and late-type galaxies, but these are significantly steeper in late-types, suggesting that radial dependence of chemical enrichment processes and the effect of gas inflow and metal transport are far more pronounced in discs. Metallicity gradients of both morphological classes correlate with galaxy mass, with negative metallicity gradients becoming steeper with increasing galaxy mass. The correlation with mass is stronger for late-type galaxies, with a slope of d(∇[Z/H])/d(logM)∼−0.2±0.05, compared to d(∇[Z/H])/d(logM)∼−0.05±0.05 for early-types. This result suggests that the merger history plays a relatively small role in shaping metallicity gradients of galaxies.
Citation
Goddard , D , Thomas , D , Maraston , C , Westfall , K B , Etherington , J , Riffel , R , Mallmann , N D , Zheng , Z , Argudo-Fernández , M , Lian , J , Bershady , M A , Bundy , K , Drory , N , Law , D R , Yan , R , Wake , D , Weijmans , A-M , Bizyaev , D , Brownstein , J R , Lane , R R , Maiolino , R , Masters , K L , Merrifield , M R , Nitschelm , C , Pan , K , Roman-Lopes , A , Storchi-Bergmann , T & Schneider , D P 2017 , ' SDSS-IV MaNGA : spatially resolved star formation histories in galaxies as a function of galaxy mass and type ' , Monthly Notices of the Royal Astronomical Society , vol. 466 , no. 4 , pp. 4731-4758 . https://doi.org/10.1093/mnras/stw3371
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stw3371
ISSN
0035-8711
Type
Journal article
Rights
© 2016, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at mnras.oxfordjournals.org / https://doi.org/10.1093/mnras/stw3371
Collections
  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2016arXiv161201546G
URI
http://hdl.handle.net/10023/10085

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