Article

On the presence of thermal Sunyaev-Zel'dovich induced signal in the first-year WMAP temperature maps

Monthly Notices of the Royal Astronomical Society (Impact Factor: 5.52). 01/2004; 347(2):403-410. DOI: 10.1111/j.1365-2966.2004.07205.x
Source: arXiv

ABSTRACT Using available optical and X-ray catalogues of clusters and
superclusters of galaxies, we build templates of thermal
Sunyaev-Zel'dovich (tSZ) emission as they should be detected by the WMAP
experiment. We compute the cross-correlation of our templates with WMAP
temperature maps, and interpret our results separately for clusters and
for superclusters of galaxies. For clusters of galaxies, we claim
2-5σ detections in our templates built from the BCS (Ebeling et
al.), NORAS (Böhringer et al.) and de Grandi et al. catalogues. In
these templates, the typical cluster temperature decrements in WMAP maps
are around 15-35 μK in the Rayleigh-Jeans range (no beam
deconvolution applied). Several tests probing the possible influence of
foregrounds in our analyses demonstrate that our results are robust
against Galactic contamination. On supercluster scales, we detect a
diffuse component in the V and W WMAP bands, which cannot be generated
by superclusters in our catalogues (Einasto et al.), and which is not
present in the clean map of Tegmark et al. Using this clean map, our
analyses yield, for Einasto's supercluster catalogues, the following
upper limit for the Comptonization parameter associated with
supercluster scales: ySC < 2.18 × 10-8 at
the 95 per cent confidence level.

0 Bookmarks
 · 
26 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Models with dark energy decaying into dark matter have been proposed in Cosmology to solve the coincidence problem. We study the effect of such coupling on the cosmic microwave background temperature anisotropies. The interaction changes the rate of evolution of the metric potentials, the growth rate of matter density perturbations and modifies the Integrated Sachs-Wolfe component of cosmic microwave background temperature anisotropies, enhancing the effect. Cross-correlation of galaxy catalogs with CMB maps provides a model independent test to constrain the interaction. We particularize our analysis for a specific interacting model and show that galaxy catalogs with median redshifts $z_m=0.1-0.9$ can rule out models with an interaction parameter strength of $c^2\simeq 0.1$ better than 99.95% confidence level. Values of $c^2\le 0.01$ are compatible with the data and may account for the possible discrepancy between the fraction of dark energy derived from WMAP 3yr data and the fraction obtained from the ISW effect. Measuring the fraction of dark energy by these two methods could provide evidence of an interaction.
    Physical review D: Particles and fields 02/2008;
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, we present a joint cross-correlation analysis of the Archeops CMB maps at 143 and 217 GHz and the WMAP CMB maps at 41, 61 and 94 GHz with sky templates of projected galaxy density constructed from the 2MASS Extended Source catalog. These templates have been divided in patches sorted in decreasing galaxy density with a fixed number of pixels (we considered patches having 32, 64 and 128 pixels) and the cross correlation has been performed independently for each of these patches. We find that the densest patch shows a strong temperature decrement in the $Q$, $V$, $W$ bands of WMAP and in the 143 GHz channel of Archeops, but not in the 217 GHz channel. Furthermore, we find that the spectral behavior of the amplitude of this decrement is compatible with that expected for the non-relativistic thermal Sunyaev-Zel'dovich effect, and is incompatible (at 4.5$\sigma$ level) with the null hypothesis of having only CMB, noise and a dust component (${\propto}\nu^2$) in those pixels. We find that the first 32-pixel sized patch samples the cores of 11 known massive nearby galaxy clusters. Under the assumption that the decrement found in this patch is due entirely to the thermal Sunyaev-Zel'dovich effect, we obtain an average comptonization parameter for those sources of $y = (0.39 \pm 0.07) \times 10^{-4}$ at 13 arcmin angular scales. This value is compatible at 1-$\sigma$ with the expectation, $y = 0.49 \times 10^{-4}$, from a model of the cluster flux number counts based on the standard $\Lambda$-CDM cosmology (Xue & Wu 2001). The observed value of $y$ is slightly diluted when computed for the first patch of 64 and 128 pixels, presumably due to the inclusion of less massive clusters, and the dilution factor inferred is also compatible with the quoted model.

    Astronomy and Astrophysics 04/2006; · 5.08 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, we try to detect the SZ effect in the 2MASS DWT clusters and less bound objects in order to constrain the warm-hot intergalactic medium distribution on large scales by cross-correlation analysis. The results of both observed WMAP and mock SZ effect map indicate that the hot gas distributes from inside as well as outside of the high density regions of galaxy clusters, which is consistent with the results of both observation and hydro simulation. Therefore, the DWT measurement of the cross-correlation would be a powerful tool to probe the missing of baryons in the Universe. Comment: 9 pages,2 figures. Accepted for publication in Mod. Phys. Lett. A
    Modern Physics Letters A 03/2006; · 1.11 Impact Factor

Full-text (2 Sources)

View
17 Downloads
Available from
Jun 2, 2014