SDSS-IV MaNGA : spatially resolved star-formation histories and the connection to galaxy physical properties
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A key task of observational extragalactic astronomy is to determine where – within galaxies of diverse masses and morphologies – stellar mass growth occurs, how it depends on galaxy properties and what processes regulate star formation. Using spectroscopic indices derived from the stellar continuum at ∼4000Å, we determine the spatially resolved star-formation histories of 980000 spaxels in 2404 galaxies in the SDSS-IV MaNGA IFU survey. We examine the spatial distribution of star-forming, quiescent, green valley, starburst and post-starburst spaxels as a function of stellar mass and morphology to see where and in what types of galaxy star formation is occurring. The spatial distribution of star-formation is dependent primarily on stellar mass, with a noticeable change in the distribution at M*>1010M⊙. Galaxies above this mass have an increasing fraction of regions that are forming stars with increasing radius, whereas lower mass galaxies have a constant fraction of star forming regions with radius. Our findings support a picture of inside-out growth and quenching at high masses. We find that morphology (measured via concentration) correlates with the fraction of star-forming spaxels, but not with their radial distribution. We find (post-)starburst regions are more common outside of the galaxy centre, are preferentially found in asymmetric galaxies, and have lower gas-phase metallicity than other regions, consistent with interactions triggering starbursts and driving low metallicity gas into regions at <1.5Re.
Rowlands , K , Heckman , T , Wild , V , Zakamska , N L , Rodriguez-Gomez , V , Barrera-Ballesteros , J , Lotz , J , Thilker , D , Andrews , B H , Boquien , M , Brinkmann , J , Brownstein , J R , Hwang , H-C & Smethurst , R 2018 , ' SDSS-IV MaNGA : spatially resolved star-formation histories and the connection to galaxy physical properties ' , Monthly Notices of the Royal Astronomical Society , vol. Advance article . https://doi.org/10.1093/mnras/sty1916
Monthly Notices of the Royal Astronomical Society
© 2018, 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 as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/sty1916
DescriptionFunding: V. W. acknowledges support from the European Research Council Starting Grant SEDmorph (P.I. V. Wild).
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