TEMPLATES FOR THE SUNYAEV-ZEL'DOVICH ANGULAR POWER SPECTRUM
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
- Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
We present templates for the Sunyaev-Zel'dovich (SZ) angular power spectrum based on four models for the nonlinear gas distribution. The frequency-dependent SZ temperature fluctuations, with thermal (TSZ) and kinetic (KSZ) contributions, are calculated by tracing through a dark matter simulation, processed to include gas in dark matter halos and in the filamentary intergalactic medium. Different halo gas models are compared to study how star formation, energetic feedback, and nonthermal pressure support influence the angular power spectrum. The standard model has been calibrated to reproduce the stellar and gas fractions and X-ray scaling relations measured from low-redshift clusters and groups. The other models illustrate the current theoretical and empirical uncertainties relating to properties of the intracluster medium. Relative to the standard model, their angular power spectra differ by approximately {+-}50% (TSZ), {+-}20% (KSZ), and {+-}40% (SZ at 148 GHz) for l = 3000, {sigma}{sub 8} = 0.8, and homogeneous reionization at z = 10. The angular power spectrum decreases in amplitude as gas mass and binding energy are removed through star formation, and as gas is pushed out to larger radii by energetic feedback. With nonthermal pressure support, less pressure is required to maintain hydrostatic equilibrium, thus reducing the thermal contribution to the SZ power. We also calculate the SZ templates as a function of {sigma}{sub 8} and quantify this dependence. Assuming C{sub l} {proportional_to} ({sigma}{sub 8}/0.8){sup {alpha}}, the effective scaling index ranges from 7 {approx}< {alpha}{sub TSZ} {approx}< 9, 4.5 {approx}< {alpha}{sub KSZ} {approx}< 5.5, and 6.5 {approx}< {alpha}{sub SZ} (148 GHz) {approx}< 8 at l = 3000 for 0.6 < {sigma}{sub 8} < 1. The template spectra are publicly available and can be used when fitting for the SZ contribution to the cosmic microwave background on arcminute scales.
- OSTI ID:
- 21567548
- Journal Information:
- Astrophysical Journal, Vol. 727, Issue 2; Other Information: DOI: 10.1088/0004-637X/727/2/94; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
Similar Records
A MEASUREMENT OF SECONDARY COSMIC MICROWAVE BACKGROUND ANISOTROPIES WITH TWO YEARS OF SOUTH POLE TELESCOPE OBSERVATIONS
A measurement of the secondary-CMB and millimeter-wave-foreground bispectrum using 800 deg{sup 2} of south pole telescope data
Related Subjects
COSMOLOGY AND ASTRONOMY
FREQUENCY DEPENDENCE
GALAXY CLUSTERS
NONLUMINOUS MATTER
RELICT RADIATION
SIMULATION
STANDARD MODEL
STARS
ELECTROMAGNETIC RADIATION
FIELD THEORIES
GRAND UNIFIED THEORY
MATHEMATICAL MODELS
MATTER
MICROWAVE RADIATION
PARTICLE MODELS
QUANTUM FIELD THEORY
RADIATIONS
UNIFIED GAUGE MODELS