Dataset

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

The University of Western Australia
Phillipps, Steven ; Ali, S. S. ; Bremer, Malcom N. ; De Propris, Roberto ; Sansom, Anne E. ; Cluver, Michelle E. ; Alpaslan, Mehmet ; Brough, Sarah ; Brown, Michael J.I. ; Davies, Luke ; Driver, Simon ; Grootes, Meiert W. ; Holwerda, Benne W. ; Hopkins, Andrew M. ; James, P. A. ; Pimbblet, Kevin ; Robotham, Aaron ; Taylor, E. N. ; Wang, Lingyu
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://research-repository.uwa.edu.au/en/datasets/d31cb11d-9d15-4176-a460-454fb937e9ac&rft.title=Data from: Galaxy And Mass Assembly (GAMA): Defining passive galaxy samples and searching for the UV upturn&rft.identifier=d31cb11d-9d15-4176-a460-454fb937e9ac&rft.publisher=SAO/NASA Astrophysics Data System (ADS)&rft.description=We 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. The range of colours is independent of group multiplicity or velocity dispersion, with isolated passive galaxies just as likely to have blue UV-to-optical colours, implying significant upturn components, as those in richer groups and in the previous data on clusters. This is supported by equivalent results for (FUV−r) colours which are clear indicators of upturn components.&rft.creator=Phillipps, Steven &rft.creator=Ali, S. S. &rft.creator=Bremer, Malcom N. &rft.creator=De Propris, Roberto &rft.creator=Sansom, Anne E. &rft.creator=Cluver, Michelle E. &rft.creator=Alpaslan, Mehmet &rft.creator=Brough, Sarah &rft.creator=Brown, Michael J.I. &rft.creator=Davies, Luke &rft.creator=Driver, Simon &rft.creator=Grootes, Meiert W. &rft.creator=Holwerda, Benne W. &rft.creator=Hopkins, Andrew M. &rft.creator=James, P. A. &rft.creator=Pimbblet, Kevin &rft.creator=Robotham, Aaron &rft.creator=Taylor, E. N. &rft.creator=Wang, Lingyu &rft.date=2020&rft.relation=http://research-repository.uwa.edu.au/en/publications/53a100bb-d404-4d5d-9740-1221a8be5eda&rft.type=dataset&rft.language=English Access the data

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We 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. The range of colours is independent of group multiplicity or velocity dispersion, with isolated passive galaxies just as likely to have blue UV-to-optical colours, implying significant upturn components, as those in richer groups and in the previous data on clusters. This is supported by equivalent results for (FUV−r) colours which are clear indicators of upturn components.

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Associated Persons
Steven Phillipps (Creator); S. S. Ali (Creator); Malcom N. Bremer (Creator); Roberto De Propris (Creator); Anne E. Sansom (Creator); Michelle E. Cluver (Creator); Mehmet Alpaslan (Creator); Sarah Brough (Creator); Michael J.I. Brown (Creator); Meiert W. Grootes (Creator); Benne W. Holwerda (Creator); Andrew M. Hopkins (Creator); P. A. James (Creator); Kevin Pimbblet (Creator); E. N. Taylor (Creator); Lingyu Wang (Creator)

Issued: 2020-02

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  • global : d31cb11d-9d15-4176-a460-454fb937e9ac