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Galaxy And Mass Assembly (GAMA): blue spheroids within 87 Mpc

Mahajan, Smriti; Drinkwater, Michael J.; Driver, S.; Hopkins, A. M.; Graham, Alister W.; Brough, S.; Brown, Michael J. I.; Holwerda, B. W.; Owers, Matt S.; Pimbblet, Kevin A.

Authors

Smriti Mahajan

Michael J. Drinkwater

S. Driver

A. M. Hopkins

Alister W. Graham

S. Brough

Michael J. I. Brown

B. W. Holwerda

Matt S. Owers

Abstract

© 2017 The Author(s). In this paper, we test if nearby blue spheroid (BSph) galaxies may become the progenitors of star-forming spiral galaxies or passively evolving elliptical galaxies. Our sample comprises 428 galaxies of various morphologies in the redshift range 0.002 < Ζ < 0.02 (8-87 Mpc) with panchromatic data from the Galaxy and Mass Assembly survey. We find that BSph galaxies are structurally (mean effective surface brightness, effective radius) very similar to their passively evolving red counterparts. However, their star formation and other properties such as colour, age, and metallicity are more like star-forming spirals than spheroids (ellipticals and lenticulars). We show that BSph galaxies are statistically distinguishable from other spheroids as well as spirals in the multidimensional space mapped by luminosity-weighted age, metallicity, dust mass, and specific star formation rate. We use HI data to reveal that some of the BSphs are (further) developing their discs, hence their blue colours. They may eventually become spiral galaxies - if sufficient gas accretion occurs - or more likely fade into low-mass red galaxies.

Journal Article Type Article
Publication Date Mar 21, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 475
Issue 1
Pages 788-799
Institution Citation Mahajan, S., Drinkwater, M. J., Driver, S., Hopkins, A. M., Graham, A. W., Brough, S., …Pimbblet, K. A. (2018). Galaxy And Mass Assembly (GAMA): blue spheroids within 87 Mpc. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, 475(1), 788-799. https://doi.org/10.1093/mnras/stx3202
DOI https://doi.org/10.1093/mnras/stx3202
Keywords Galaxies: evolution; Galaxies: fundamental parameters; Galaxies: star formation; Galaxies: stellar content; Galaxies: structure
Publisher URL https://academic.oup.com/mnras/article/475/1/788/4733292
Related Public URLs https://research-repository.st-andrews.ac.uk/handle/10023/12639
Copyright Statement © 2017, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stx3202

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Copyright Statement
© 2017, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stx3202



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