University of Oulu

Nelvy Choque-Challapa, J Alfonso L Aguerri, Pavel E Mancera Piña, Reynier Peletier, Aku Venhola, Marc Verheijen, The dwarf galaxy population in nearby clusters from the KIWICS survey, Monthly Notices of the Royal Astronomical Society, Volume 507, Issue 4, November 2021, Pages 6045–6060, https://doi.org/10.1093/mnras/stab2420

The dwarf galaxy population in nearby clusters from the KIWICS survey

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Author: Choque-Challapa, Nelvy1; Aguerri, J. Alfonso L.2,3; Mancera Piña, Pavel E.1,4;
Organizations: 1Kapteyn Astronomical Institute, University of Groningen , Landleven 12, NL-9747 AD Groningen, the Netherlands
2Instituto de Astrofísica de Canarias , E-38200 La Laguna, Tenerife, Spain
3Dept. Astrofísica, Universidad de La Laguna , E-38206 La Laguna, Tenerife, Spain
4ASTRON, Netherlands Institute for Radio Astronomy , Postbus 2, NL-7900 AA Dwingeloo, the Netherlands
5Space physics and astronomy research unit, University of Oulu , Pentti Kaiteran katu 1, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 7.5 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021111555162
Language: English
Published: Oxford University Press, 2021
Publish Date: 2021-11-15
Description:

Abstract

We analyse a sample of 12 galaxy clusters, from the Kapteyn IAC WEAVE INT Cluster Survey (KIWICS) looking for dwarf galaxy candidates. By using photometric data in the r and g bands from the Wide Field Camera (WFC) at the 2.5-m Isaac Newton Telescope (INT), we select a sample of bright dwarf galaxies (Mr ≤ −15.5 mag) in each cluster and analyse their spatial distribution, stellar colour, and as well as their Sérsic index and effective radius. We quantify the dwarf fraction inside the R200 radius of each cluster, which ranges from ∼0.7 to ∼0.9. Additionally, when comparing the fraction in the inner region with the outermost region of the clusters, we find that the fraction of dwarfs tends to increase going to the outer regions. We also study the clustercentric distance distribution of dwarf and giant galaxies (Mr < −19.0 mag), and in half of the clusters of our sample, the dwarfs are distributed in a statistically different way as the giants, with the giant galaxies being closer to the cluster centre. We analyse the stellar colour of the dwarf candidates and quantify the fraction of blue dwarfs inside the R200 radius, which is found to be less than ∼0.4, but increases with distance from the cluster centre. Regarding the structural parameters, the Sérsic index for the dwarfs we visually classify as early-type dwarfs tends to be higher in the inner region of the cluster. These results indicate the role that the cluster environment plays in shaping the observational properties of low-mass haloes.

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Series: Monthly notices of the Royal Astronomical Society
ISSN: 0035-8711
ISSN-E: 1365-8711
ISSN-L: 0035-8711
Volume: 507
Issue: 4
Pages: 6045 - 6060
DOI: 10.1093/mnras/stab2420
OADOI: https://oadoi.org/10.1093/mnras/stab2420
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: RP and NCC 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. NCC acknowledges the financial support from CONICYT PFCHA/DOCTORADO BECAS CHILE/2016 - 72170347. PEMP was supported by the Netherlands Research School for Astronomy (Nederlandse Onderzoekschool voor Astronomie, NOVA), Project 10.1.5.6.
Copyright information: © The Author(s) 2021. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
  https://creativecommons.org/licenses/by/4.0/