A population of faint low surface brightness galaxies in the Perseus cluster core

Wittmann, Carolin; Lisker, Thorsten; Ambachew Tilahun, Liyualem; Grebel, Eva K.; Conselice, Christopher J.; Penny, Samantha; Janz, Joachim; Gallagher, John S.; Kotulla, Ralf; McCormac, James

Abstract

We present the detection of 89 low surface brightness (LSB), and thus low stellar density galaxy candidates in the Perseus cluster core, of the kind named ‘ultra-diffuse galaxies’, with mean effective V-band surface brightnesses 24.8-27.1 mag arcsec−2, total V-band magnitudes −11.8 to −15.5 mag, and half-light radii 0.7-4.1 kpc. The candidates have been identified in a deep mosaic covering 0.3 square degrees, based on wide-field imaging data obtained with the William Herschel Telescope. We find that the LSB galaxy population is depleted in the cluster centre and only very few LSB candidates have half-light radii larger than 3 kpc. This appears consistent with an estimate of their tidal radius, which does not reach beyond the stellar extent even if we assume a high dark matter content (M/L = 100). In fact, three of our candidates seem to be associated with tidal streams, which points to their current disruption. Given that published data on faint LSB candidates in the Coma cluster – with its comparable central density to Perseus – show the same dearth of large objects in the core region, we conclude that these cannot survive the strong tides in the centres of massive clusters.

Citation

Wittmann, C., Lisker, T., Ambachew Tilahun, L., Grebel, E. K., Conselice, C. J., Penny, S., …McCormac, J. (2017). A population of faint low surface brightness galaxies in the Perseus cluster core. Monthly Notices of the Royal Astronomical Society, 470(2), 1512-1525. https://doi.org/10.1093/mnras/stx1229

• Journal Article Type: Article
• Acceptance Date: May 17, 2017
• Online Publication Date: May 20, 2017
• Publication Date: Sep 11, 2017
• Deposit Date: Jun 15, 2017
• Publicly Available Date: Jun 15, 2017
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 470
• Issue: 2
• Pages: 1512-1525
• DOI: https://doi.org/10.1093/mnras/stx1229
• Keywords: galaxies: dwarf, galaxies: clusters: individual: Perseus, galaxies: photometry, galaxies: fundamental parameters, galaxies: evolution
• Public URL: https://nottingham-repository.worktribe.com/output/882083
• Publisher URL: https://academic.oup.com/mnras/article/doi/10.1093/mnras/stx1229/3837816/A-population-of-faint-low-surface-brightness
• Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record is available online at: https://academic.oup.com/mnras/article/doi/10.1093/mnras/stx1229/3837816/A-population-of-faint-low-surface-brightness