Environmental Effects on the UV Upturn in Local Clusters of Galaxies

Sadman Shariar Ali; Malcolm Bremer; Steven Phillipps; Roberto De Propris

doi:10.1093/mnras/stz1502

Environmental Effects on the UV Upturn in Local Clusters of Galaxies

Sadman Shariar Ali, Malcolm Bremer, Steven Phillipps, Roberto De Propris

School of Physics

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Abstract

We explore the dependence of 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 FUV 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.

Original language	English
Article number	stz1502
Pages (from-to)	3021-3028
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	487
Issue number	3
Early online date	3 Jun 2019
DOIs	https://doi.org/10.1093/mnras/stz1502
Publication status	Published - 1 Aug 2019

Keywords

galaxies: formation and evolution
stars: horizontal branch

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10.1093/mnras/stz1502

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This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Oxford University Press at https://doi.org/10.1093/mnras/stz1502 . Please refer to any applicable terms of use of the publisher.
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https://arxiv.org/abs/1905.12655

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title = "Environmental Effects on the UV Upturn in Local Clusters of Galaxies",

abstract = "We explore the dependence of 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 FUV 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. ",

keywords = "galaxies: formation and evolution, stars: horizontal branch",

author = "Ali, {Sadman Shariar} and Malcolm Bremer and Steven Phillipps and {De Propris}, Roberto",

year = "2019",

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doi = "10.1093/mnras/stz1502",

language = "English",

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journal = "Monthly Notices of the Royal Astronomical Society",

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TY - JOUR

T1 - Environmental Effects on the UV Upturn in Local Clusters of Galaxies

AU - Ali, Sadman Shariar

AU - Bremer, Malcolm

AU - Phillipps, Steven

AU - De Propris, Roberto

PY - 2019/8/1

Y1 - 2019/8/1

N2 - We explore the dependence of 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 FUV 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.

AB - We explore the dependence of 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 FUV 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.

KW - galaxies: formation and evolution

KW - stars: horizontal branch

UR - https://arxiv.org/pdf/1905.12655.pdf

U2 - 10.1093/mnras/stz1502

DO - 10.1093/mnras/stz1502

M3 - Article (Academic Journal)

SN - 0035-8711

VL - 487

SP - 3021

EP - 3028

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

M1 - stz1502

ER -

Environmental Effects on the UV Upturn in Local Clusters of Galaxies

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