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

• Verfasst von: Wittmann, Carolin [VerfasserIn]
• Verfasst von: Lisker, Thorsten [VerfasserIn]
• Verfasst von: Ambachew Tilahun, Liyualem [VerfasserIn]
• Verfasst von: Grebel, Eva K. [VerfasserIn]
• Titel: A population of faint low surface brightness galaxies in the Perseus cluster core
• Verf.angabe: Carolin Wittmann, Thorsten Lisker, Liyualem Ambachew Tilahun, Eva K. Grebel, Christopher J. Conselice, Samantha Penny, Joachim Janz, John S. Gallagher III, Ralf Kotulla, and James McCormac
• Fussnoten: Gesehen am 18.10.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Jahr Quelle: 2017
• Band/Heft Quelle: (2017) Artikel-Nummer 1705.09697, 16 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1564521745

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.