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Biases on the cosmological parameters and thermal SZ residuals
Nicolas Taburet, Nabila Aghanim, Marian Douspis +1
We examine the biases induced on cosmological parameters when the presence of secondary anisotropies is not taken into account in Cosmic Microwave Background analyses. We first dev…
Optimising large galaxy surveys for ISW detection
Marian Douspis, Patricia G. Castro, Chiara Caprini +1
We report on investigations of the power of next generation cosmic microwave background and large scale structure surveys in constraining the nature of dark energy through the cros…
The cross-correlation of the CMB polarisation and the 21-cm line fluctuations from cosmic reionisation
Hiroyuki Tashiro, Nabila Aghanim, Mathieu Langer +2
The cosmic microwave background (CMB) polarisation and the 21 cm line fluctuations are powerful probes of cosmological reionisation. We study how the cross-correlation between the…
SZ and CMB reconstruction using Generalized Morphological Component Analysis
J. Bobin, Y. Moudden, J. -L. Starck +2
In the last decade, the study of cosmic microwave background (CMB) data has become one of the most powerful tools to study and understand the Universe. More precisely, measuring th…
Secondary anisotropies of the CMB
Nabila Aghanim, Subhabrata Majumdar, Joseph Silk
The Cosmic Microwave Background fluctuations provide a powerful probe of the dark ages of the universe through the imprint of the secondary anisotropies associated with the reionis…
Secondary B-mode polarization from Faraday rotation in clusters and galaxies
Hiroyuki Tashiro, Nabila Aghanim, Mathieu Langer
We revisit the polarisation induced by Faraday rotation when Cosmic Microwave Background photons traverse magnetised plasma. We compute the secondary B-mode angular power spectrum…
On the detectability of non-trivial topologies
M. Kunz, N. Aghanim, A. Riazuelo +1
We explore the main physical processes which potentially affect the topological signal in the Cosmic Microwave Background (CMB) for a range of toroidal universes. We consider speci…
The evolution of clusters in the CLEF cosmological simulation: X-ray structural and scaling properties
Scott T. Kay, Antonio C. da Silva, Nabila Aghanim +5
We present results from a study of the X-ray cluster population that forms within the CLEF cosmological hydrodynamics simulation, a large N-body/SPH simulation of the Lambda CDM co…
Small scale contributions to CMB: A coherent analysis
Marian Douspis, Nabila Aghanim, Mathieu Langer
We reanalyse Cosmic Microwave Background data from experiments probing both large and small scales. We assume that measured anisotropies are due not only to primary fluctuations bu…
Constraining topology in harmonic space
M. Kunz, N. Aghanim, L. Cayon +3
We consider several ways to test for topology directly in harmonic space by comparing the measured a_lm with the expected correlation matrices. Two tests are of a frequentist natur…
Magnetic fields from reionisation
Mathieu Langer, Nabila Aghanim, Jean-Loup Puget
We present a complementary study to a new model for generating magnetic fields of cosmological interest. The driving mechanism is the photoionisation process by photons provided by…
Number counts in homogeneous and inhomogeneous dark energy models
N. J. Nunes, A. C. da Silva, N. Aghanim
In the simple case of a constant equation of state, redshift distribution of collapsed structures may constrain dark energy models. Different dark energy models having the same ene…
Clusters of Galaxies: New Results from the CLEF Hydrodynamics Simulation
S. T. Kay, A. C. da Silva, N. Aghanim +5
Preliminary results are presented from the CLEF hydrodynamics simulation, a large (N=2(428)^3 particles within a 200 Mpc/h comoving box) simulation of the LCDM cosmology that inclu…
The CLEF-SSH simulation project
A. C. da Silva, S. T. Kay, N. Aghanim +5
The CLEF-SSH simulation project is an international collaboration, involving the IAS, LATT and the University of Sussex, to produce large hydrodynamic simulations of large-scale st…
CMB Quadrupole induced polarisation from clusters and filaments
Guo-Chin Liu, Antonio da Silva, Nabila Aghanim
We present the estimates of the Cosmic Microwave Background (CMB) polarisation power spectrum from galaxy clusters and filaments using hydrodynamical simulations of large scale str…
Primordial quadrupole-induced polarisation from filamentary structures and galaxy clusters
Guo Chin Liu, Antonio da Silva, Nabila Aghanim
We present the first computation of the Cosmic Microwave Background (CMB) polarisation power spectrum from galaxy clusters and filaments using hydrodynamical simulations of large s…
The distance duality relation from X-ray and SZ observations of clusters
Jean-Philippe Uzan, Nabila Aghanim, Yannick Mellier
X-ray and Sunyaev-Zel'dovich data of clusters of galaxies enable to construct a test of the distance duality relation between the angular and luminosity distances. We argue that su…
Separating the kinetic SZ effect from primary CMB fluctuations
O. Forni, N. Aghanim
In the present work, we propose a new method aiming at extracting the kinetic Sunyaev-Zel'dovich (KSZ) temperature fluctuations embedded in the primary anisotropies of the cosmic m…
Trouble for cluster parameter estimation from blind SZ surveys?
Nabila Aghanim, Steen H. Hansen, Guilaine Lagache
(Abriged version) The Sunyaev-Zel'dovich (SZ) effect of galaxy clusters is a tool to measure three quantities: Compton parameter, electron temperature, and cluster peculiar velocit…
Detection and discrimination of cosmological non-Gaussian signatures by multi-scale methods
J. L. Starck, N. Aghanim, O. Forni
Recent Cosmic Microwave Background (CMB) observations indicate that the temperature anisotropies arise from quantum fluctuations in the inflationary scenario. In the simplest infla…
Non-Gaussianity: Comparing wavelet and Fourier based methods
N. Aghanim, M. Kunz, P. G. Castro +1
In the context of the present and future Cosmic Microwave Background (CMB) experiments, going beyond the information provided by the power spectrum has become necessary in order to…
Cosmological Magnetogenesis driven by Radiation Pressure
Mathieu Langer, Jean-Loup Puget, Nabila Aghanim
The origin of large scale cosmological magnetic fields remains a mystery, despite the continuous efforts devoted to that problem. We present a new model of magnetic field generatio…
Extraction of cluster parameters with future Sunyaev-Zel'dovich observations
Nabila Aghanim, Steen H. Hansen, Sergio Pastor +1
The Sunyaev-Zel'dovich (SZ) effect of galaxy clusters is characterized by three parameters: Compton parameter, electron temperature and cluster peculiar velocity. In the present st…
XMM-Newton observation of the distant (z=0.6) galaxy cluster RX J1120.1+4318
M. Arnaud, S. Majerowicz, D. Lumb +12
We report on a 20 ksec XMM observation of the distant cluster RXJ1120.1+4318, discovered at z=0.6 in the SHARC survey. The cluster has a regular spherical morphology, suggesting it…