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. and Pimbblet, Kevin A. (2018) Galaxy And Mass Assembly (GAMA): blue spheroids within 87 Mpc. Monthly Notices of the Royal Astronomical Society, 475 1: 788-799. doi:10.1093/mnras/stx3202

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Author 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.
Title Galaxy And Mass Assembly (GAMA): blue spheroids within 87 Mpc
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 2018-03-21
Year available 2017
Sub-type Article (original research)
DOI 10.1093/mnras/stx3202
Open Access Status File (Publisher version)
Volume 475
Issue 1
Start page 788
End page 799
Total pages 12
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Abstract 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 < z < 0.02 (8-87 Mpc) 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 H-1 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 ass red galaxies.
Keyword Galaxies: evolution
Galaxies: fundamental parameters
Galaxies: star formation
Galaxies: stellar content
Galaxies: structure
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DST/INSPIRE/04/2015/002311
Institutional Status UQ
Additional Notes This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Monthly Notices of the Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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Created: Sat, 14 Apr 2018, 20:28:22 EST