University of Oulu

Pavel E Mancera Piña, J A L Aguerri, Reynier F Peletier, Aku Venhola, Scott Trager, Nelvy Choque Challapa, The evolution of ultra-diffuse galaxies in nearby galaxy clusters from the Kapteyn IAC WEAVE INT Clusters Survey, Monthly Notices of the Royal Astronomical Society, Volume 485, Issue 1, May 2019, Pages 1036–1052,

The evolution of ultra-diffuse galaxies in nearby galaxy clusters from the Kapteyn IAC WEAVE INT Clusters Survey

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Author: Piña, Pavel E. Mancera1,2; Aguerri, J. A. L.3; Peletier, Reynier F.1;
Organizations: 1Kapteyn Astronomical Institute, University of Groningen, Landleven 12, NL-9747 AD Groningen, the Netherlands
2ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, NL-7990 AA Dwingeloo, the Netherlands
3Instituto de Astrofısica de Canarias, Calle Vıa L ́actea S/N, 38205, La Laguna, Tenerife, Spain
4Astronomy Research Unit, University of Oulu, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
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Language: English
Published: Oxford University Press, 2019
Publish Date: 2019-10-29


We study the population of ultra-diffuse galaxies (UDGs) in a set of eight nearby (⁠z < 0.035) galaxy clusters, from the Kapteyn IAC WEAVE INT Clusters Survey. We report the discovery of 442 UDG candidates in our eight field of views, with 247 of these galaxies lying at projected distances <1R200 from their host cluster. With the aim of testing theories about their formation, we study the scaling relations of UDGs comparing with different types of galaxies, finding that in the full parameter space they behave as dwarf galaxies and their colours do not seem to correlate with their effective radii. To investigate the influence of the environment on the evolution of UDGs, we analyse their structural properties as functions of the projected clustercentric distance and the mass of their host cluster. We find no systematic trends for the stellar mass nor effective radius as function of the projected distance. However, the fraction of blue UDGs seem to be lower towards the centre of clusters, and UDGs in the inner and outer regions of clusters have different Sérsic index and axial ratio distributions. Specifically, the axial ratio distributions of the outer and inner UDGs resemble the axial ratio distributions of, respectively, late-type dwarfs and dwarf ellipticals in the Fornax Cluster suggesting an environmentally driven evolution and another link between UDGs and dwarf galaxies. In general our results suggest strong similarities between UDGs and smaller dwarf galaxies in their structural parameters and their transformation within clusters.

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Series: Monthly notices of the Royal Astronomical Society
ISSN: 0035-8711
ISSN-E: 1365-8711
ISSN-L: 0035-8711
Volume: 485
Issue: 1
Pages: 1036 - 1052
DOI: 10.1093/mnras/stz238
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: PEMP thanks the Netherlands Research School for Astronomy (NOVA) for funding via the NOVA MSc Fellowship. PEMP, RFP, and AV acknowledge financial support from the European Union’s Horizon 2020 research and innovation programme under Marie Skłodowska-Curie grant agreement no. 721463 to the SUNDIAL ITN network. JALA acknowledges support from the Spanish Ministerio de Economía y Competitividad (MINECO) by the grants AYA2013-43188-P and AYA2017-83204-P. AV would like to thank the Vilho, Yrjö, and Kalle Väisälä Foundation of the Finnish Academy of Science and Letters for the funding during the writing of this paper.
EU Grant Number: (721463) SUNDIAL - SUrvey Network for Deep Imaging Analysis and Learning
Copyright information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.