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          Institute: MPI für Astrophysik     Collection: Cosmology     Display Documents

ID: 10722.0, MPI für Astrophysik / Cosmology
Simulating the Sunyaev-Zeldovich effect(s): Including radiative cooling and energy injection by galactic winds
Authors:White, M.; Hernquist, L.; Springel, V.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:The Astrophysical Journal
Journal Abbrev.:Astrophys. J.
Issue / Number:1
Start Page:16
End Page:22
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present results on the thermal and kinetic Sunyaev-Zeldovich (SZ) effects from a sequence of high-resolution hydrodynamic simulations of structure formation, including cooling, feedback, and metal injection. These simulations represent a self-consistent thermal model that incorporates ideas from the "preheating " scenario while preserving good agreement with the low-density intergalactic medium at z similar to 3 probed by the Lyalpha forest. Four simulations were performed, at two different resolutions with and without radiative effects and star formation. The long-wavelength modes in each simulation were the same, so we can compare the results on an object-by- object basis. We demonstrate that our simulations are converged to the subarcminute level. The effect of the additional physics is to suppress the mean Comptonization parameter by 20% and to suppress the angular power spectrum of fluctuations by just under a factor of 2 in this model, while leaving the source counts and properties relatively unchanged. We quantify how non-Gaussianity in the SZ maps increases the sample variance over the standard result for Gaussian fluctuations. We identify a large scatter in the Y-M relation that will be important in searches for clusters using the SZ effect(s).
Free Keywords:cosmic microwave background; cosmology : theory; galaxies : clusters : general; large-scale structure of universe; methods : numerical
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley,; CA 94720 USA; Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA; Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA; Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA; Max Planck Inst Astrophys, D-85748 Garching, Germany
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