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Galaxy and mass assembly (GAMA): The merging potential of brightest group galaxies

Banks, K.; Brough, S.; Holwerda, B. W.; Hopkins, A. M.; López-Sánchez, R.; Phillipps, S.; Pimbblet, K. A.; Robotham, A. S.G.


K. Banks

S. Brough

B. W. Holwerda

A. M. Hopkins

R. López-Sánchez

S. Phillipps

A. S.G. Robotham


Using a volume-limited sample of 550 groups from the Galaxy And Mass Assembly Galaxy Group Catalogue spanning the halo mass range 12.8 < log[Mh M?] < 14.2, we investigate the merging potential of central Brightest Group Galaxies (BGGs). We use spectroscopically confirmed close-companion galaxies as an indication of the potential stellar mass buildup of low-redshift BGGs, z . 0.2. We identify 17 close-companion galaxies with projected separations rp < 30 kpc, relative velocities ?v . 300 km s-1, and stellar mass ratios MBGG/MCC = 4 relative to the BGG. These close-companion galaxies yield a total pair fraction of 0.03 ± 0.01. Overall, we find that BGGs in our sample have the potential to grow in stellar mass due to mergers by 2.2 ± 1.5% Gyr-1. This is lower than the stellar mass growth predicted by current galaxy evolution models.


Banks, K., Brough, S., Holwerda, B. W., Hopkins, A. M., López-Sánchez, R., Phillipps, S., …Robotham, A. S. (2021). Galaxy and mass assembly (GAMA): The merging potential of brightest group galaxies. The Astrophysical journal, 921(1), 9.

Journal Article Type Article
Acceptance Date Aug 6, 2021
Online Publication Date Oct 29, 2021
Publication Date 2021-11
Deposit Date Jan 11, 2022
Publicly Available Date Oct 30, 2022
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 921
Issue 1
Article Number 47
Pages 9
Keywords Galaxy evolution; Galaxy groups; Early-type galaxies
Public URL


2108.05923 (3.4 Mb)

Copyright Statement
© 2021. The American Astronomical Society.

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