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

Wittmann, Carolin and Lisker, Thorsten and Ambachew Tilahun, Liyualem and Grebel, Eva K. and Conselice, Christopher J. and Penny, Samantha and Janz, Joachim and Gallagher, John S. and Kotulla, Ralf and McCormac, James (2017) A population of faint low surface brightness galaxies in the Perseus cluster core. Monthly Notices of the Royal Astronomical Society . ISSN 1365-2966

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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.

Item Type: Article
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
Keywords: galaxies: dwarf, galaxies: clusters: individual: Perseus, galaxies: photometry, galaxies: fundamental parameters, galaxies: evolution
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1093/mnras/stx1229
Depositing User: Eprints, Support
Date Deposited: 15 Jun 2017 13:02
Last Modified: 15 Jun 2017 21:38
URI: http://eprints.nottingham.ac.uk/id/eprint/43610

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