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

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posted on 2023-06-09, 01:16 authored by 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 Heath Jones, L S Kelvin, M A Lara-López, J Liske, A R López-Sánchez, Jonathan LovedayJonathan Loveday, M Meyer, P Norberg, 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 WHa versus [N ii]/Ha (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.

Funding

Astronomy rolling grant; G0278; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I000976/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

4

Volume

453

Page range

3519-3539

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-05-16

First Open Access (FOA) Date

2016-05-16

First Compliant Deposit (FCD) Date

2016-05-16

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