SDSS-IV MaNGA: star formation cessation in low-redshift galaxies I: dependence on stellar mass and structural properties

We investigate radial gradients in the recent star formation history (SFH) of 1917 MaNGA galaxies with 0.01 < z < 0.14. For each galaxy, we obtain two-dimensional maps and radial profiles for three spectroscopically-measured parameters that are sensitive to the recent SFH: Dn(4000) (the 4000̊A...

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Main Authors:	Wang, Enci, Li, Cheng, Xiao, Ting, Lin, Lin, Bershady, Matthew, Law, David R., Merrifield, Michael, Sanchez, Sebastian F., Riffel, Rogemar A., Riffel, Rogério, Yan, Renbin
Format:	Article
Language:	English English
Published:	American Astronomical Society 2018
Online Access:	http://eprints.nottingham.ac.uk/50327/ http://eprints.nottingham.ac.uk/50327/ http://eprints.nottingham.ac.uk/50327/ http://eprints.nottingham.ac.uk/50327/1/Wang_EC_SFH_gradients_in_MaNGA_galaxies.pdf http://eprints.nottingham.ac.uk/50327/8/pdf.pdf

id	nottingham-50327
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spelling	nottingham-503272018-06-10T02:31:31Z http://eprints.nottingham.ac.uk/50327/ SDSS-IV MaNGA: star formation cessation in low-redshift galaxies I: dependence on stellar mass and structural properties Wang, Enci Li, Cheng Xiao, Ting Lin, Lin Bershady, Matthew Law, David R. Merrifield, Michael Sanchez, Sebastian F. Riffel, Rogemar A. Riffel, Rogério Yan, Renbin We investigate radial gradients in the recent star formation history (SFH) of 1917 MaNGA galaxies with 0.01 < z < 0.14. For each galaxy, we obtain two-dimensional maps and radial profiles for three spectroscopically-measured parameters that are sensitive to the recent SFH: Dn(4000) (the 4000̊A break), EW(HδA) and EW(Hα) (equivalent width of the Hδ absorption and Hα emission line). The majority of the spaxels are consistent with models of continuously declining star formation rate, indicating that starbursts occur rarely in local galaxies with regular morphologies. We classify the galaxies into three classes: fully star-forming (SF), partly quenched (PQ) and totally quenched (TQ). The galaxies less massive than 10 10 M present at most weak radial gradients in the diagnostic parameters. In contrast, massive galaxies with stellar mass above 10 10 M present significant gradients in the three diagnostic parameters if classified as SF or PQ, but show weak gradients in D n (4000) and EW(H δ A ) and no gradients in EW(H α ) if in the TQ class. This implies the existence of a critical stellar mass (∼ 10 10 M) above which the star formation in a galaxy gets shutdown from the inside out. Galaxies tend to evolve synchronously from inner to outer regions before their mass reaches the critical value. We have further divided the sample at fixed mass by both bulge-to-total luminosity ratio and morphological type, finding that our conclusions hold regardless of these factors: it appears that the presence of a central dense object is not a driving parameter, but rather a byproduct of the star formation cessation process. American Astronomical Society 2018-04-02 Article PeerReviewed application/pdf en http://eprints.nottingham.ac.uk/50327/1/Wang_EC_SFH_gradients_in_MaNGA_galaxies.pdf application/pdf en http://eprints.nottingham.ac.uk/50327/8/pdf.pdf Wang, Enci and Li, Cheng and Xiao, Ting and Lin, Lin and Bershady, Matthew and Law, David R. and Merrifield, Michael and Sanchez, Sebastian F. and Riffel, Rogemar A. and Riffel, Rogério and Yan, Renbin (2018) SDSS-IV MaNGA: star formation cessation in low-redshift galaxies I: dependence on stellar mass and structural properties. Astrophysical Journal, 856 (2). pp. 1-22. ISSN 1538-4357 http://iopscience.iop.org/article/10.3847/1538-4357/aab263 doi:10.3847/1538-4357/aab263 doi:10.3847/1538-4357/aab263
repository_type	Digital Repository
institution_category	Local University
institution	University of Nottingham Malaysia Campus
building	Nottingham Research Data Repository
collection	Online Access
language	English English
description	We investigate radial gradients in the recent star formation history (SFH) of 1917 MaNGA galaxies with 0.01 < z < 0.14. For each galaxy, we obtain two-dimensional maps and radial profiles for three spectroscopically-measured parameters that are sensitive to the recent SFH: Dn(4000) (the 4000̊A break), EW(HδA) and EW(Hα) (equivalent width of the Hδ absorption and Hα emission line). The majority of the spaxels are consistent with models of continuously declining star formation rate, indicating that starbursts occur rarely in local galaxies with regular morphologies. We classify the galaxies into three classes: fully star-forming (SF), partly quenched (PQ) and totally quenched (TQ). The galaxies less massive than 10 10 M present at most weak radial gradients in the diagnostic parameters. In contrast, massive galaxies with stellar mass above 10 10 M present significant gradients in the three diagnostic parameters if classified as SF or PQ, but show weak gradients in D n (4000) and EW(H δ A ) and no gradients in EW(H α ) if in the TQ class. This implies the existence of a critical stellar mass (∼ 10 10 M) above which the star formation in a galaxy gets shutdown from the inside out. Galaxies tend to evolve synchronously from inner to outer regions before their mass reaches the critical value. We have further divided the sample at fixed mass by both bulge-to-total luminosity ratio and morphological type, finding that our conclusions hold regardless of these factors: it appears that the presence of a central dense object is not a driving parameter, but rather a byproduct of the star formation cessation process.
format	Article
author	Wang, Enci Li, Cheng Xiao, Ting Lin, Lin Bershady, Matthew Law, David R. Merrifield, Michael Sanchez, Sebastian F. Riffel, Rogemar A. Riffel, Rogério Yan, Renbin
spellingShingle	Wang, Enci Li, Cheng Xiao, Ting Lin, Lin Bershady, Matthew Law, David R. Merrifield, Michael Sanchez, Sebastian F. Riffel, Rogemar A. Riffel, Rogério Yan, Renbin SDSS-IV MaNGA: star formation cessation in low-redshift galaxies I: dependence on stellar mass and structural properties
author_facet	Wang, Enci Li, Cheng Xiao, Ting Lin, Lin Bershady, Matthew Law, David R. Merrifield, Michael Sanchez, Sebastian F. Riffel, Rogemar A. Riffel, Rogério Yan, Renbin
author_sort	Wang, Enci
title	SDSS-IV MaNGA: star formation cessation in low-redshift galaxies I: dependence on stellar mass and structural properties
title_short	SDSS-IV MaNGA: star formation cessation in low-redshift galaxies I: dependence on stellar mass and structural properties
title_full	SDSS-IV MaNGA: star formation cessation in low-redshift galaxies I: dependence on stellar mass and structural properties
title_fullStr	SDSS-IV MaNGA: star formation cessation in low-redshift galaxies I: dependence on stellar mass and structural properties
title_full_unstemmed	SDSS-IV MaNGA: star formation cessation in low-redshift galaxies I: dependence on stellar mass and structural properties
title_sort	sdss-iv manga: star formation cessation in low-redshift galaxies i: dependence on stellar mass and structural properties
publisher	American Astronomical Society
publishDate	2018
url	http://eprints.nottingham.ac.uk/50327/ http://eprints.nottingham.ac.uk/50327/ http://eprints.nottingham.ac.uk/50327/ http://eprints.nottingham.ac.uk/50327/1/Wang_EC_SFH_gradients_in_MaNGA_galaxies.pdf http://eprints.nottingham.ac.uk/50327/8/pdf.pdf
first_indexed	2018-09-06T14:12:53Z
last_indexed	2018-09-06T14:12:53Z
_version_	1610867722125574144

SDSS-IV MaNGA: star formation cessation in low-redshift galaxies I: dependence on stellar mass and structural properties

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