期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 385, 期 4, 页码 2097-2106出版社
BLACKWELL PUBLISHING
DOI: 10.1111/j.1365-2966.2008.12967.x
关键词
galaxies : elliptical and lenticular, cD; galaxies : stellar content; ultraviolet : galaxies
资金
- STFC [ST/F002963/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002963/1] Funding Source: researchfish
We present GALEX near-ultraviolet (NUV) and Two-Micron All-Sky Survey 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 (similar to 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 (> 5.5 sigma) 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.
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