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Cosmology & eXtragalactics

Welcome on the pages of the COSMology & eXtragalactics (COSM!X) team.

 

Our research reaches from the primordial fluctuations in the Universe down to its structuration at the largest scales in the most recent era. We study how the cosmic web elements are forming and evolving both through modelling and observations.

 

 

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4 years 1 month ago

To reconcile the standard cosmological model with the X-ray measured number of galaxy clusters, a team of French scientists has shown that the cluster masses should be increased by 70% compared to current estimates. These results follow the conclusions obtained by the Planck mission in 2013 from observations of galaxy clusters in the microwave domain. This huge difference is intriguing: either our understanding of the physics of galaxy clusters needs to be revised, or the standard cosmological model is incomplete.

4 years 8 months ago

Many new and enigmatic high redshift galaxies that are intensively forming stars have been discovered using ESA’s Planck and Herschel satellites . These galaxies occur in clumps – and could be the long-sought formation phase of galaxy clusters. Some appear very bright, and have been found to be gravitationally lensed galaxies. These rapidly star-forming galaxies could help solve a central problem in cosmology: how did the large scale structure of galaxies form?

4 years 10 months ago

News about Dark Matter, neutrinos, first stars and the cosmological model: the Planck collaboration, with a leading participation of the Institut d'Astrophysique Spatiale, has just published nearly twenty articles revealing many important results that will allow to better understand major chapters in the book of the Universe.

4 years 10 months ago

By analysing their data jointly, the Planck and BICEP2/Keck collaborations have shown that the detection of primordial gravitational waves through the observation of the polarisation of the Cosmic Microwave Background (CMB) has not occurred yet. This result constitutes the denouement of the scientific drama that kept enthralled cosmologists and universe enthusiasts alike since March 2014: the signal, the detection of which has been reported by the BICEP2 team, is not related to the first instants of the Big Bang. It results from the combination of the Galactic signal and of gravitational distortions of the CMB during its propagation down to us.

5 years 6 days ago

Beginning the 1st December at an international conference in Ferrara (Italy), the Planck collaboration, which involves the CNRS, the CEA, the CNES and several French universities among other institutes, reveals the results of four years of observation by the ESA Planck satellite of the Cosmic Microwave Background (CMB), the oldest light in the universe. For the first time, the CMB is accurately measured on the whole sky in both its intensity and polarisation.

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