تقرير
SDSS-IV MaNGA: Spatially resolved star-formation histories and the connection to galaxy physical properties
| العنوان: | SDSS-IV MaNGA: Spatially resolved star-formation histories and the connection to galaxy physical properties |
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| المؤلفون: | Rowlands, K., Heckman, T., Wild, V., Zakamska, N. L., Rodriguez-Gomez, V., Barrera-Ballesteros, J., Lotz, J., Thilker, D., Andrews, B. H., Brinkmann, J., Boquien, M., Brownstein, J. R., Hwang, H-C., Smethurst, R. |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | 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 $\sim 4000$\AA, 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 \mstar$>10^{10}$\msun. 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 $<1.5R_e$. Comment: Accepted for publication in MNRAS. 16 pages, 14 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/sty1916 |
| URL الوصول: | http://arxiv.org/abs/1807.06066 |
| رقم الأكسشن: | edsarx.1807.06066 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/sty1916 |
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