Penny, SJ, Brown, MJI, Pimbblet, KA, Cluver, ME, Croton, DJ, Owers, MS, Lange, R, Alpaslan, M, Baldry, IK, Bland-Hawthorn, J, Brough, S, Driver, SP, Holwerda, BW, Hopkins, AM, Jarrett, TH, Jones, DH, Kelvin, LS, Lara-Lopez, MA, Liske, J, Lopez-Sanchez, AR et al, Loveday, J, Meyer, M, Norberg, P, Robotham, ASG and 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.
ISSN 0035-8711
(Accepted)
Abstract
We examine the properties of galaxies in the Galaxies and Mass Assembly (GAMA) survey located in voids with radii $>10~h^{-1}$ Mpc. Utilising the GAMA equatorial survey, 592 void galaxies are identified out to z~0.1 brighter than $M_{r} = -18.4$, our magnitude completeness limit. Using the $W_{\rm{H\alpha}}$ vs. [NII]/H$\alpha$ (WHAN) line strength diagnostic diagram, we classify their spectra as star forming, AGN, or dominated by old stellar populations. For objects more massive than $5\times10^{9}$ M$_{\odot}$, 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 WISE 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 hypothesise 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 $10^{10}$ M$_{\odot}$, where internally driven processes play an increasingly important role in galaxy evolution.
| Item Type: |
Article
|
| Additional Information: |
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society. |
| Uncontrolled Keywords: |
astro-ph.GA; astro-ph.GA |
| Subjects: |
Q Science > QB Astronomy |
| Divisions: |
Astrophysics Research Institute |
| Publisher: |
Oxford University Press |
| Related URLs: |
|
| Date Deposited: |
04 Sep 2015 09:14 |
| Last Modified: |
04 Sep 2021 14:00 |
| URI: |
https://researchonline.ljmu.ac.uk/id/eprint/1932 |
Available Versions of this Item
-
Galaxy And Mass Assembly (GAMA): The Bright Void Galaxy Population in the Optical and Mid-IR. (deposited 04 Sep 2015 09:14)
[Currently Displayed]
 |
View Item |
Tools
Tools
