The empty ring galaxy ESO 474-G040

Noah Brosch*, Petri Väisänen, Alexei Y. Kniazev, Alexei Moiseev

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We describe observations of the apparently empty ring galaxy ESO 474-G040 obtained with the Southern African Large Telescope. The observations, consisting of imaging, long-slit spectroscopy and Fabry-Pérot mapping of the H α line, allow determining the ring kinematics as well as estimating the metallicity of the ring and the stellar population composition in its various parts. We propose that the object could best be understood as being the result of a past merger of disc galaxies, which formed a gas ring that subsequently disrupted via the bead instability and is presently forming stars.

Original languageEnglish
Pages (from-to)4114-4125
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume451
Issue number4
DOIs
StatePublished - 24 Apr 2015

Keywords

  • Galaxies: individual: ESO 474-G040
  • Galaxies: peculiar

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