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Article overview
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NUV-IR colours of red sequence galaxies in local clusters | | Timothy D. Rawle
; Russell J. Smith
; John R. Lucey
; Michael J. Hudson
; Gary A. Wegner
; | | Date: |
15 Jan 2008 | | Abstract: | We present GALEX near-UV (NUV) and 2MASS J band photometry for red sequence
galaxies in local clusters. We define quiescent samples according to a strict
emission threshold, removing galaxies with very recent star formation. We
analyse the NUV-J colour-magnitude relation (CMR) and find that the intrinsic
scatter is an order of magnitude larger than for the analogous optical CMR
(~0.35 rather than 0.05 mag), in agreement with previous studies. Comparing the
NUV-J colours with spectroscopically-derived stellar population parameters, we
find a strong (> 5.5sigma) correlation with metallicity, only a marginal trend
with age, and no correlation with the alpha/Fe ratio. We explore the origin of
the large scatter and conclude that neither aperture effects nor the UV upturn
phenomenon contribute significantly. We show that the scatter could be
attributed to simple ’frosting’ by either a young or a low metallicity
subpopulation. | | Source: | arXiv, 0801.2390 | | Services: | Forum | Review | PDF | Favorites | |
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