Hydrodynamic Simulations of the SunyaevZeldovich Effect(s)
Abstract
We have performed a sequence of highresolution hydrodynamic simulations of structure formation in a ΛCDM model to study the thermal and kinetic SunyaevZeldovich (SZ) effects. Including only adiabatic gas physics, we demonstrate that our simulations for the thermal effect are converged down to subarcminute scales. In this model, the angular power spectrum of cosmic microwave background (CMB) anisotropies induced by the thermal effect peaks at l~=10^{4}, and reaches an amplitude just below current observational upper limits. Fluctuations due to the kinetic effect are a factor of ~=30 lower in power and peak at slightly smaller angular scales. We identify individual SZ sources and compute their counts as a function of source strength and angular size. We present a preliminary investigation of the consequences of an early epoch of energy injection, which tends to suppress power on small angular scales, while giving rise to additional power on large scales from the reheated intergalactic matter (IGM) at high redshift.
 Publication:

The Astrophysical Journal
 Pub Date:
 March 2001
 DOI:
 10.1086/319473
 arXiv:
 arXiv:astroph/0008133
 Bibcode:
 2001ApJ...549..681S
 Keywords:

 Cosmology: Cosmic Microwave Background;
 Cosmology: Theory;
 Galaxies: Clusters: General;
 Cosmology: LargeScale Structure of Universe;
 Methods: Numerical;
 Astrophysics
 EPrint:
 7 pages, published in ApJ, flawed factor of h=0.67 in y/bresults corrected, see http://www.mpagarching.mpg.de/~volker/erratum.ps.gz for detailed erratum