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Guo Chin Liu

Publications and source records attributed to Guo Chin Liu.

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Recent developments in astrophysical and cosmological exploitation of microwave surveys

In this article we focus on the astrophysical results and the related cosmological implications derived from recent microwave surveys, with emphasis to those coming from the Planck mission. We critically discuss the impact of systematics effects and the role of methods to separate the cosmic microwave background signal from the astrophysical emissions and each different astrophysical component from the others. We then review of the state of the art in diffuse emissions, extragalactic sources, cosmic infrared back- ground, and galaxy clusters, addressing the information they provide to our global view of the cosmic structure evolution and for some crucial physical parameters, as the neutrino mass. Finally, we present three different kinds of scientific perspectives for fundamental physics and cosmology offered by the analysis of on-going and future cosmic microwave background projects at different angular scales dedicated to anisotropies in total intensity and polarization and to absolute temperature.

astro-ph.CO

Primordial quadrupole-induced polarisation from filamentary structures and galaxy clusters

We present the first computation of the Cosmic Microwave Background (CMB) polarisation power spectrum from galaxy clusters and filaments using hydrodynamical simulations of large scale structure. We give the $E$ and $B$ mode power spectra of the CMB quadrupole induced polarisation between $\ell \sim 560$ and 20000. We find that the contribution from warm ionised gas in filamentary structures dominates the polarised signal from galaxy clusters by more than one order of magnitude on large scales (below $\ell \sim 1000$) and by a factor of about two on small scales ($\ell \gsim 10000$). We study the dependence of the power spectra with $σ_8$. Assuming the power spectra vary like $σ_8^n$ we find $n=3.2-4.0$ for filaments and $n=3.5-4.6$ for clusters.

astro-ph