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20 April 2024 |
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Galaxies at the extremes: Ultra-diffuse galaxies in the Virgo Cluster | | Chris Mihos
; Patrick R. Durrell
; Laura Ferrarese
; John J. Feldmeier
; Patrick Côté
; Eric W. Peng
; Paul Harding
; Chengze Liu
; Stephen Gwyn
; Jean-Charles Cuillandre
; | | Date: |
8 Jul 2015 | | Abstract: | We report the discovery of three large (R29 >~ 1 arcminute) extremely low
surface brightness (mu_(V,0) ~ 27.0) galaxies identified using our deep,
wide-field imaging of the Virgo Cluster from the Burrell Schmidt telescope.
Complementary data from the Next Generation Virgo Cluster Survey do not resolve
red giant branch stars in these objects down to i=24, yielding a lower distance
limit of 2.5 Mpc. At the Virgo distance, these objects have half-light radii
3-10 kpc and luminosities L_V=2-9x10^7 Lsun. These galaxies rival the most
extreme LSB galaxies recently identified in the Coma cluster and are located
well within Virgo’s virial radius; two are projected directly on the cluster
core. One object appears to be a nucleated LSB in the process of being tidally
stripped to form a new Virgo ultracompact dwarf galaxy. The others show no sign
of tidal disruption, despite the fact that such objects should be most
vulnerable to tidal destruction in the cluster environment. The relative
proximity of Virgo makes these objects amenable to detailed studies of their
structural properties and stellar populations. They thus provide an important
new window onto the connection between cluster environment and galaxy evolution
at the extremes. | | Source: | arXiv, 1507.2270 | | Services: | Forum | Review | PDF | Favorites | |
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