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Environments and morphologies of red sequence galaxies with residual star formation in massive clusters

Research output: Contribution to journalJournal articlepeer-review

Published
  • Jacob P. Crossett
  • Kevin A. Pimbblet
  • John P. Stott
  • D. H. Jones D. Heath
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<mark>Journal publication date</mark>21/01/2014
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number3
Volume437
Number of pages10
Pages (from-to)2521-2530
Publication StatusPublished
Early online date28/11/13
<mark>Original language</mark>English

Abstract

We present a photometric investigation into recent star formation in galaxy clusters at z ~ 0.1. We use spectral energy distribution templates to quantify recent star formation in large Xray- selected clusters from the LARCS survey using matched GALEX near-ultraviolet (NUV) photometry. These clusters all have signs of red sequence galaxy recent star formation (as indicated by the blue NUV - R colour), regardless of the cluster morphology and size. A trend in environment is found for these galaxies, such that they prefer to occupy low-density, highcluster- radius environments. The morphology of these UV-bright galaxies suggests that they are in fact red spirals, which we confirm with light profiles and Galaxy Zoo voting percentages as morphological proxies. These UV-bright galaxies are therefore seen to be either truncated spiral galaxies, caught by ram pressure infalling into the cluster, or high-mass spirals, with the photometry dominated by the older stellar population.