Journal
ASTRONOMY & ASTROPHYSICS
Volume 496, Issue 3, Pages 637-644Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200810692
Keywords
large-scale structure of Universe
Categories
Funding
- CNES
- Programme National de Cosmologie
- STFC
- Fundacao Ciencia e Tecnologia (FCT) [SFRH/BPD/20583/2004]
- CIENCIA
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/20583/2004] Funding Source: FCT
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Context. Clusters are potentially powerful tools for cosmology provided their observed properties, such as the Sunyaev-Zel'dovich (SZ) or X-ray signals, can be translated into physical quantities like mass and temperature. Scaling relations are the appropriate means to perform this translation. It is, therefore, important to understand their evolution and their modifications with respect to the physics and to the underlying cosmology. Aims. In this spirit, we investigate the effect of dark energy on the X-ray and SZ scaling relations. The study is based on the first hydro-simulations of cluster formation for diferent models of dark energy. We present results for four dark-energy models which differ from each other by their equations-of-state parameter, w. Namely, we use a cosmological constant model w = -1 (as a reference), a perfect fluid with constant equation of state parameter w = -0.8 and one with w = -1.2 and a scalar field model (or quintessence) with varying w. Methods. We generate N-body/hydrodynamic simulations that include radiative cooling with the public version of the Hydra code, modified to consider an arbitrary dark-energy component. We produce cluster catalogues for the four models and derive the associated X-ray and SZ scaling relations. Results. We find that dark energy has little effect on scaling laws, making it safe to use the standard Lambda CDM scalings for conversion of observed quantities into cluster temperatures and masses.
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