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The dwarf low surface brightness galaxy population of the Virgo Cluster – II. Colours and H i line observations

Sabatini, Sabina, Davies, Jonathan Ivor, van Driel, W., Baes, Maarten, Roberts, S., Smith, R., Linder, S. and O'Neil, K. 2005. The dwarf low surface brightness galaxy population of the Virgo Cluster – II. Colours and H i line observations. Monthly Notices of the Royal Astronomical Society 357 (3) , pp. 819-833. 10.1111/j.1365-2966.2005.08608.x

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n order to investigate the nature of dwarf low surface brightness (LSB) galaxies we have undertaken a deep B- and I-band CCD survey of a 14-deg2 strip in the Virgo Cluster and applied a Fourier convolution technique to explore its dwarf galaxy population down to a central surface brightness of ∼26 B mag arcsec−2 and a total absolute B mag of ∼−10. In this paper we carry out an analysis of their morphology, (B−I) colours and atomic hydrogen content. We compare these properties with those of dwarf galaxies in other environments to try and assess how the cluster environment has influenced their evolution. Field dwarfs are generally of a more irregular morphology, are bluer and contain relatively more gas. We assess the importance that various physical processes have on the evolution of cluster dwarf galaxies (ram-pressure stripping, tidal interactions, supernova-driven gas loss). We suggest that enhanced star formation triggered by tidal interactions is the major reason for the very different general properties of cluster dwarfs: they have undergone accelerated evolution.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: galaxies: clusters: individual: Virgo Cluster; galaxies: dwarf
Publisher: John Wiley
ISSN: 0035-8711
Last Modified: 10 Oct 2017 14:29

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