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Do galaxy global relationships emerge from local ones? The SDSS IV MaNGA surface mass density-metallicity relation

Barrera-Ballesteros, Jorge K.; Heckman, Timothy M.; Zhu, Guangtun B.; Zakamska, Nadia L.; Sánchez, Sebastian F.; Law, David; Wake, David; Green, Jenny E.; Bizyaev, Dmitry; Oravetz, Daniel; Simmons, Audrey; Malanushenko, Elena; Pan, Kaike; Roman Lopes, Alexandre and Lane, Richard R. (2016). Do galaxy global relationships emerge from local ones? The SDSS IV MaNGA surface mass density-metallicity relation. Monthly Notices of the Royal Astronomical Society, 463(3) pp. 2513–2522.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1093/mnras/stw1984
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Abstract

We present the stellar surface mass density versus gas metallicity (Σ*-Z) relation for more than 500 000 spatially resolved star-forming resolution elements (spaxels) from a sample of 653 disc galaxies included in the SDSS IV MaNGA survey. We find a tight relation between these local properties, with higher metallicities as the surface density increases. This relation extends over three orders of magnitude in the surface mass density and a factor of 4 in metallicity. We show that this local relationship can simultaneously reproduce two well-known properties of disc galaxies: their global mass–metallicity relationship and their radial metallicity gradients. We also find that the Σ*-Z relation is largely independent of the galaxy's total stellar mass and specific star formation rate (sSFR), except at low stellar mass and high sSFR. These results suggest that in the present-day universe local properties play a key role in determining the gas-phase metallicity in typical disc galaxies.

Item Type: Journal Item
Copyright Holders: 2016 The Authors
ISSN: 1365-2966
Keywords: imaging spectroscopy; galactic abundances; galaxies; interstellar medium
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Health and Wellbeing PRA (Priority Research Area)
Item ID: 48516
Depositing User: David Wake
Date Deposited: 20 Feb 2017 10:43
Last Modified: 01 May 2019 17:49
URI: http://oro.open.ac.uk/id/eprint/48516
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