Galaxy And Mass Assembly (GAMA): Defining passive galaxy samples and searching for the UV upturn

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dc.contributor.authorCluver, M. E.
dc.contributor.authorPhillipps, S.
dc.contributor.authorAli, S. S.
dc.date.accessioned2021-02-12T07:54:57Z
dc.date.available2021-02-12T07:54:57Z
dc.date.issued2019
dc.description.abstractWe use data from the GAMA and GALEX surveys to demonstrate that the UV upturn, an unexpected excess of ultraviolet flux from a hot stellar component, seen in the spectra of many early-type galaxies, arises from processes internal to individual galaxies with no measurable influence from the galaxies’ larger environment. We first define a clean sample of passive galaxies without a significant contribution to their UV flux from low-level star formation. We confirm that galaxies with the optical colours of red sequence galaxies often have signs of residual star formation, which, without other information, would prevent a convincing demonstration of the presence of UV upturns. However, by including (NUV−u) and WISE (W2–W3) colours, and FUV data where it exists, we can convincingly constrain samples to be composed of non-star-forming objects. Using such a sample, we examine GALEX photometry of low-redshift GAMA galaxies in a range of low-density environments, from groups to the general field, searching for UV upturns. We find a wide range of (NUV−r) colours, entirely consistent with the range seen – and attributed to the UV upturn – in low-redshift red sequence cluster galaxies.en_US
dc.identifier.citationCluver, M. E. et al. (2020). Galaxy And Mass Assembly (GAMA): Defining passive galaxy samples and searching for the UV upturn. Monthly Notices of the Royal Astronomical Society, 492(2), 2128–2139en_US
dc.identifier.issn1365-2966
dc.identifier.urihttps://doi.org/10.1093/mnras/stz3552
dc.identifier.urihttp://hdl.handle.net/10566/5908
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.subjectGalaxies: evolutionen_US
dc.subjectGalaxies: star formationen_US
dc.subjectGalaxies: stellar contenten_US
dc.subjectGalaxy And Mass Assembly (GAMA)en_US
dc.subjectUV upturnen_US
dc.titleGalaxy And Mass Assembly (GAMA): Defining passive galaxy samples and searching for the UV upturnen_US
dc.typeArticleen_US

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