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The Korean Astronomical Society (한국천문학회)
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AGE DATING GALAXY GROUPS IN THE MILLENNIUM SIMULATION

  • RAOUF, MOJTABA (School of Astronomy, Institute for Research in Fundamental Sciences (IPM)) ;
  • KHOSROSHAHI, HABIB G. (School of Astronomy, Institute for Research in Fundamental Sciences (IPM))
  • Received : 2014.11.30
  • Accepted : 2015.06.30
  • Published : 2015.09.30
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Abstract

We study galaxies drawn from the semi-analytic models of Guo et al. (2011) based on the Millennium Simulation. We establish a set of four observationally measurable parameters which can be used in combination to identify a subset of galaxy groups which are old, with a very high probability. We therefore argue that a sample of fossil groups selected based on the luminosity gap will result in a contaminated sample of old galaxy groups. By adding constraints on the luminosity of the brightest galaxy, and its offset from the group luminosity centroid, we can considerably improve the age-dating.

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References

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