“School of Astronomy”
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| Paper IPM / Astronomy / 14345 |
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We use multi-wavelength observations of galaxy groups to probe the formation models for galaxy formation
in cosmological simulations, statistically. The observations include Chandra and XMM-Newton
X-ray observations, optical photometry and radio observations at 1.4 GHz and 610 MHz. Using a large
sample of galaxy groups observed by the XMM-Newton X-ray telescope as part of the XMM-Large Scale
Survey, we carried out a statistical study of the redshift evolution of the luminosity gap for a well de-
fined mass-selected group sample and show the relative success of some of the semi-analytic models in
reproducing the observed properties of galaxy groups up to redshift z �?� 1.2. The observed trend argues
in favour of a stronger evolution of the feedback from active galactic nuclei at z < 1 compared to the
models. The slope of the relation between the magnitude of the brightest cluster galaxy and the value
of the luminosity gap does not evolve with redshift and is well reproduced by the models. We find that
the radio power of giant elliptic galaxies residing in galaxy groups with a large luminosity gap are lower
compared to giant ellipticals of the same stellar masses but in typical galaxy groups.
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