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Galaxy And Mass Assembly (GAMA): the bright void galaxy population in the optical and mid-IR

Penny, S.J.; Brown, M.J.I.; Pimbblet, K.A.; Cluver, M.E.; Croton, D.J.; Owers, M.S.; Lange, R.; Alpaslan, M.; Baldry, I.; Bland-Hawthorn, J.; Brough, S.; Driver, S.P.; Holwerda, B.W.; Hopkins, A.M.; Jarrett, T.H.; Jones, D.H.; Kelvin, L.S.; Lara-López, M.A.; Liske, J.; López-Sánchez, A.R.; Loveday, J.; Meyer, M.; Norberg, P.; Robotham, A.S.G.; Rodrigues, M.

Galaxy And Mass Assembly (GAMA): the bright void galaxy population in the optical and mid-IR Thumbnail


S.J. Penny

M.J.I. Brown

K.A. Pimbblet

M.E. Cluver

D.J. Croton

M.S. Owers

R. Lange

M. Alpaslan

I. Baldry

J. Bland-Hawthorn

S. Brough

S.P. Driver

B.W. Holwerda

A.M. Hopkins

T.H. Jarrett

D.H. Jones

L.S. Kelvin

M.A. Lara-López

J. Liske

A.R. López-Sánchez

J. Loveday

M. Meyer

A.S.G. Robotham

M. Rodrigues


We examine the properties of galaxies in the Galaxies and Mass Assembly (GAMA) survey located in voids with radii >10 h−1 Mpc. Utilizing the GAMA equatorial survey, 592 void galaxies are identified out to z ≈ 0.1 brighter than Mr = −18.4, our magnitude completeness limit. Using the WHα versus [N ii]/Hα (WHAN) line strength diagnostic diagram, we classify their spectra as star forming, AGN, or dominated by old stellar populations. For objects more massive than 5 × 109 M⊙, we identify a sample of 26 void galaxies with old stellar populations classed as passive and retired galaxies in the WHAN diagnostic diagram, else they lack any emission lines in their spectra. When matched to Wide-field Infrared Survey Explorer mid-IR photometry, these passive and retired galaxies exhibit a range of mid-IR colour, with a number of void galaxies exhibiting [4.6] − [12] colours inconsistent with completely quenched stellar populations, with a similar spread in colour seen for a randomly drawn non-void comparison sample. We hypothesize that a number of these galaxies host obscured star formation, else they are star forming outside of their central regions targeted for single-fibre spectroscopy. When matched to a randomly drawn sample of non-void galaxies, the void and non-void galaxies exhibit similar properties in terms of optical and mid-IR colour, morphology, and star formation activity, suggesting comparable mass assembly and quenching histories. A trend in mid-IR [4.6] − [12] colour is seen, such that both void and non-void galaxies with quenched/passive colours <1.5 typically have masses higher than 1010 M⊙, where internally driven processes play an increasingly important role in galaxy evolution.


Penny, S., Brown, M., Pimbblet, K., Cluver, M., Croton, D., Owers, M., …Rodrigues, M. (2015). Galaxy And Mass Assembly (GAMA): the bright void galaxy population in the optical and mid-IR. Monthly Notices of the Royal Astronomical Society, 453(4), 3519-3539.

Journal Article Type Article
Acceptance Date Aug 18, 2015
Publication Date Nov 11, 2015
Deposit Date Feb 3, 2016
Publicly Available Date Feb 11, 2016
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 453
Issue 4
Pages 3519-3539
Keywords Galaxies: evolution, Galaxies: general, Infrared: galaxies.


Published Journal Article (11.6 Mb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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