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SDSS IV MaNGA - sSFR profiles and the slow quenching of discs in green valley galaxies

Belfiore, Francesco; Maiolino, Roberto; Bundy, Kevin; Masters, Karen; Bershady, Matthew; Oyarzún, Grecco; Lin, Lihwai; Cano-Diaz, Mariana; Wake, David; Spindler, Ashley; Thomas, Daniel; Brownstein, Joel R; Drory, Niv and Yan, Renbin (2018). SDSS IV MaNGA - sSFR profiles and the slow quenching of discs in green valley galaxies. Monthly Notices of the Royal Astronomical Society, 477(3) pp. 3014–3029.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1093/mnras/sty768
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Abstract

We study radial profiles in Hα equivalent width and specific star formation rate (sSFR) derived from spatially-resolved SDSS-IV MaNGA spectroscopy to gain insight on the physical mechanisms that suppress star formation and determine a galaxy’s location in the SFR- M diagram. Even within the star-forming ‘main sequence’, the measured sSFR decreases with stellar mass, both in an integrated and spatially-resolved sense. Flat sSFR radial profiles are observed for log(M/M)<10.5, while star-forming galaxies of higher mass show a significant decrease in sSFR in the central regions, a likely consequence of both larger bulges and an inside-out growth history. Our primary focus is the green valley, constituted by galaxies lying below the star formation main sequence, but not fully passive. In the green valley we find sSFR profiles that are suppressed with respect to star-forming galaxies of the same mass at all galactocentric distances out to 2 effective radii. The responsible quenching mechanism therefore appears to affect the entire galaxy, not simply an expanding central region. The majority of green valley galaxies of log(M/M)>10.0 are classified spectroscopically as central low-ionisation emission-line regions (cLIERs). Despite displaying a higher central stellar mass concentration, the sSFR suppression observed in cLIER galaxies is not simply due to the larger mass of the bulge. Drawing a comparison sample of star forming galaxies with the same M and Σ1 kpc (the mass surface density within 1 kpc), we show that a high Σ1 kpc is not a sufficient condition for determining central quiescence.

Item Type: Journal Item
Copyright Holders: 2018 The Author(s)
ISSN: 1365-2966
Keywords: galaxies: ISM, galaxies: evolution, galaxies: fundamental parameters, galaxies: survey
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 54024
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 29 Mar 2018 14:24
Last Modified: 24 May 2018 14:31
URI: http://oro.open.ac.uk/id/eprint/54024
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