Discriminating between unresolved point sources and "negative" SZ clusters in CMB maps

Abstract

Clusters of galaxies produce negative features at wavelengths $\lambda >1.25$ mm in CMB maps, by means of the thermal SZ effect, while point radio sources produce positive peaks. This fact implies that a distribution of unresolved SZ clusters could be detected using the negative asymmetry introduced in the odd-moments of the brightness map (skewness and higher), or in the probability distribution function (PDF) for the fluctuations, once the map has been filtered in order to remove the contribution from primordial CMB fluctuations from large scales. This property provides a consistency check to the recent detections from CBI and BIMA experiments of an excess of power at small angular scales, in order to confirm that they are produced by a distribution of unresolved SZ clusters. However it will require at least 1.5 - 2 times more observing time than detection of corresponding power signal. This approach could also be used with the data of the planned SZ experiments (e.g. ACT, AMI, AMIBA, APEX, 8 m South Pole telescope).

Includes a new section and a new appendix. Typos corrected. Accepted for publication in MNRAS

References in corpus (18)

• Cosmology with the Sunyaev-Zel'dovich Effect
• The Sunyaev-Zel'dovich angular power spectrum as a probe of cosmological parameters
• The Anisotropy of the Microwave Background to l = 3500: Deep Field Observations with the Cosmic Background Imager
• Gravitating mass profiles of nearby galaxy clusters and relations with X-ray gas temperature, luminosity and mass
• Measurement of the cosmic microwave background bispectrum on the COBE DMR sky maps
• Surveying the Sky with the Arcminute MicroKelvin Imager: Expected Constraints on Galaxy Cluster Evolution and Cosmology
• The Micro-Jansky Sky at 8.4 GHz
• Optimal detection of sources on a homogeneous and isotropic background
• Estimate of the Cosmological Bispectrum from the MAXIMA-1 Cosmic Microwave Background Map
• Non-Gaussian Aspects of Thermal and Kinetic Sunyaev-Zel'dovich Effects
• The Sunyaev Zel'dovich effect: simulation and observation
• Measurement of Arcminute Scale Anisotropy with the BIMA Array
• First results from the Very Small Array -- II. Observations of the CMB
• Radio Point Sources and the Thermal SZ Power Spectrum
• Weak Lensing of the CMB: Cumulants of the Probability Distribution Function
• Small Angular Scale CMB Anisotropies from CBI and BIMA: Early Universe or Local structures ?
• CMB-Normalized Predictions for Sunyaev-Zel'dovich effect fluctuations
• An Analytical Approach to the Spin-Distribution of Dark Halos

Cited by in corpus (29)

• The Simons Observatory: Science goals and forecasts
• Planck 2013 results. XXIX. Planck catalogue of Sunyaev-Zeldovich sources
• Planck Early Results VIII: The all-sky Early Sunyaev-Zeldovich cluster sample
• SZ effects in the Magneticum Pathfinder Simulation: Comparison with the Planck, SPT, and ACT results
• Cosmology from the Thermal Sunyaev-Zel'dovich Power Spectrum: Primordial non-Gaussianity and Massive Neutrinos
• Superposition of blackbodies and the dipole anisotropy: A possibility to calibrate CMB experiments
• Bispectrum of the Sunyaev-Zel'dovich Effect
• Can we neglect relativistic temperature corrections in the Planck thermal SZ analysis?
• Final Results from the BIMA CMB Anisotropy Survey and Search for Signature of the SZ effect
• Clusters of galaxies in the microwave band: influence of the motion of the Solar System
• The Atacama Cosmology Telescope: A Measurement of the Thermal Sunyaev-Zel'dovich Effect Using the Skewness of the CMB Temperature Distribution
• An alpha-stable approach to the study of the P(D) distribution of unresolved point sources in CMB sky maps
• A VSA search for the extended Sunyaev-Zel'dovich Effect in the Corona Borealis Supercluster
• Planck intermediate results. LVI. Detection of the CMB dipole through modulation of the thermal Sunyaev-Zeldovich effect: Eppur si muove II
• Cosmological Constraints from Moments of the Thermal Sunyaev-Zel'dovich Effect
• Exploring Cosmic Origins with CORE: Cluster Science
• Constraints on the Energy Content of the Universe from a Combination of Galaxy Cluster Observables
• Removing the giants and learning from the crowd: a new SZ power spectrum method and revised Compton $y$-map analysis
• An improved Compton parameter map of thermal Sunyaev-Zeldovich effect from Planck PR4 data
• An alternative validation strategy for the Planck cluster catalog and $y$-distortion maps
• Observations of the Corona Borealis supercluster with the superextended Very Small Array: further constraints on the nature of the non-Gaussian CMB cold spot
• Limits on the fluctuating part of $y$-type distortion monopole from Planck and SPT results
• SZ Scaling Relations of Galaxy Groups and Clusters Near the North Ecliptic Pole
• Constraining the intracluster pressure profile from the thermal SZ power spectrum
• The Sunyaev-Zeldovich effect in superclusters of galaxies using gasdynamical simulations: the case of Corona Borealis
• Spectral Indications of thermal Sunyaev-Zel'dovich Effect in Archeops and WMAP Data
• Cross-correlation between the soft X-ray background and SZ Sky
• Contamination of Cluster Radio Sources in the Measurement of the Thermal Sunyaev-Zel'dovich Angular Power Spectrum
• An updated and improved thermal SZ $y$-map from Planck PR4 data