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Paper   IPM / Astronomy / 14348
School of Astronomy
  Title:   Age Dating Galaxy Groups in the Millennium Simulation
1.  M. Raouf
2.  H.G. Khosroshahi
  Status:   Published
  Journal: Journal of The Korean Astronomical Society
  Vol.:  30
  Year:  2015
  Pages:   363-365
  Supported by:            ipm IPM
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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