Galaxy And Mass Assembly (GAMA) : blue spheroids within 87 Mpc
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) 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 multi-dimensional 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 disks, hence their blue colours. They may eventually become spiral galaxies — if sufficient gas accretion occurs — or more likely fade into low-mass red galaxies.
Citation
Mahajan , S , Drinkwater , M J , Driver , S , Hopkins , A M , Graham , A W , Brough , S , Brown , M J I , Holwerda , B W , Owers , M S & Pimbblet , K A 2018 , ' Galaxy And Mass Assembly (GAMA) : blue spheroids within 87 Mpc ' , Monthly Notices of the Royal Astronomical Society , vol. 475 , no. 1 , pp. 788-799 . https://doi.org/10.1093/mnras/stx3202
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Rights
© 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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