A1 Refereed original research article in a scientific journal
Environmental effects on the UV upturn in local clusters of galaxies
Authors: Sadman S. Ali, Malcolm N. Bremer, Steven Phillipps, Roberto De Propris
Publisher: OXFORD UNIV PRESS
Publication year: 2019
Journal: Monthly Notices of the Royal Astronomical Society
Journal acronym: MON NOT R ASTRON SOC
Volume: 487
Issue: 3
First page : 3021
Last page: 3028
Number of pages: 8
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/stz1502
Web address : https://academic.oup.com/mnras/article/487/3/3021/5510432
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/42056229
We explore the dependence of ultraviolet (UV) upturn colours in early-type cluster galaxies on the properties of their parent clusters (such as velocity dispersion and X-ray luminosity) and on the positions and kinematics of galaxies within them. We use a sample of 24 nearby clusters with highly complete spectroscopy and optical/infrared data to select a suitable sample of red-sequence galaxies, whose far-ultraviolet and NUV magnitudes we measure from archival GALEX data. Our results show that the UV upturn colour has no dependence on cluster properties and has the same range in all clusters. There is also no dependence on the projected position within clusters or on line-of-sight velocity. Therefore, our conclusion is that the UV upturn phenomenon is an intrinsic feature of cluster early-type galaxies, irrespective of their cluster environment.
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