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Paper   IPM / Astronomy / 13915
School of Astronomy
  Title:   Mining the gap: evolution of the magnitude gap in X-ray galaxy groups from the 3-square-degree XMM coverage of CFHTLS
1.  G. Gozaliasl
2.  A. Finoguenov
3.  H.G. Khosroshahi
4.  M. Mirkazemi
5.  M. Salvato
6.  D.M.Z. Jassur
7.  G. Erfanianfar
8.  P. Popesso
9.  M. Tanaka
10.  M. Lerchster
11.  J.P. Kneib
12.  H.J. McCracken
13.  Y. Mellier
14.  E. Egami
15.  M.J. Pereira
16.  F. Brimoioulle
17.  T. Erben
18.  S. Seitz
  Status:   Published
  Journal: Astronomy & Astrophysics
  Vol.:  566
  Year:  2014
  Pages:   32
  Supported by:  IPM
We present a catalog of 129 X-ray galaxy groups, covering a redshift range 0.04 <z< 1.23, selected in the  3 deg2 part of the CFHTLS W1 field overlapping XMM observations performed under the XMM-LSS project. We carry out a statistical study of the redshift evolution out to redshift one of the magnitude gap between the first and the second brightest cluster galaxies of a well defined mass-selected group sample. We find that the slope of the relation between the fraction of groups and the magnitude gap steepens with redshift, indicating a larger fraction of fossil groups at lower redshifts. We find that 22.2 ± 6

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