Ultra Diffuse Galaxies in the IC1459 Group from the VEGAS Survey

Duncan A. Forbes; Bililign T. Dullo; Jonah Gannon; Warrick J. Couch; Enrichetta Iodice; Marilena Spavone; Michele Cantiello; Pietro Schipani

doi:10.1093/mnras/staa1111

Ultra Diffuse Galaxies in the IC1459 Group from the VEGAS Survey

Astrophysics of Galaxies 2020-05-06 v1 Cosmology and Nongalactic Astrophysics

Authors: Duncan A. Forbes , Bililign T. Dullo , Jonah Gannon , Warrick J. Couch , Enrichetta Iodice , Marilena Spavone , Michele Cantiello , Pietro Schipani

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Abstract

Using deep g,r,i imaging from the VEGAS survey, we have searched for ultra diffuse galaxies (UDGs) in the IC 1459 group. Assuming they are group members, we identify 9 galaxies with physical sizes and surface brightnesses that match the UDG criteria within our measurement uncertainties. They have mean colours of g--i = 0.6 and stellar masses of $\sim$ 10 $^8$ M $_{\odot}$ . Several galaxies appear to have associated systems of compact objects, e.g. globular clusters. Two UDGs contain a central bright nucleus, with a third UDG revealing a remarkable double nucleus. This appears to be the first reported detection of a double nucleus in a UDG - its origin is currently unclear.

Keywords

ultra diffuse galaxies ic 1459 group vegas survey globular clusters double nucleus stellar mass

Cite

@article{arxiv.2004.10855,
  title  = {Ultra Diffuse Galaxies in the IC1459 Group from the VEGAS Survey},
  author = {Duncan A. Forbes and Bililign T. Dullo and Jonah Gannon and Warrick J. Couch and Enrichetta Iodice and Marilena Spavone and Michele Cantiello and Pietro Schipani},
  journal= {arXiv preprint arXiv:2004.10855},
  year   = {2020}
}

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6 pages, 4 figures, accepted for publication in MNRAS

Ultra Diffuse Galaxies in the IC1459 Group from the VEGAS Survey

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