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

## TL;DR

This study identifies 89 ultra-diffuse galaxy candidates in the Perseus cluster core, revealing a depletion of large, faint low surface brightness galaxies likely due to tidal disruption in the dense cluster environment.

## Contribution

First comprehensive detection and analysis of ultra-diffuse galaxy candidates in the Perseus cluster core, highlighting their distribution and tidal disruption effects.

## Key findings

- LSB galaxy candidates have mean surface brightness 24.8-27.1 mag arcsec$^{-2}$
- Depletion of large LSB galaxies in cluster center observed
- Some candidates associated with tidal streams indicating disruption

## 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.