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novembre 2018
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Coralie Neiner (LESIA) - TBD

Vendredi 9 novembre 2018 11:00-12:00


Joel Vernet (ESO) - A multi-phase study of the Circum Galactic Medium in High-z radio galaxies with MUSE and ALMA

Vendredi 16 novembre 2018 11:00-12:00

Radio galaxies (radio loud type-2 AGN) are among the most massive and luminous galaxies known at any redshift. They are found in high density environments (proto-clusters) and since the 1990s, it is known that they are surrounded by massive haloes extending to 150-200 kpc. These emission-line haloes extend well beyond the boundaries of the host galaxy, and form the link between its inter-stellar medium and the intra-cluster gas in the proto-cluster environment, i.e. the Circum Galactic Medium (CGM). They may well represent the accretion flows feeding the host galaxies with primordial gas from filamentary large-scale structures. The AGN is the flashlight illuminating and revealing these structures which play a crucial role in the galaxy formation process.
In this talk, I will present the results of an on-going VLT/MUSE and ALMA study of a sample of radio galaxies at 3<z<4.5 aimed at drawing a complete picture of the nature of these giant haloes in all possible phases : ionized, molecular, atomic, neutral.

Andrea Ferrara (SNS, Pise) - The Interstellar Medium of High Redshift Galaxies

Vendredi 23 novembre 2018 11:00-12:00

In the last decade we have explored the cosmic depths and found a statistically significant number of galaxies well into the Epoch of Reionization. However, our physical knowledge of these pristine objects remains very scant. Investigating the internal structure, interstellar medium and evolution of early galaxies is the next challenge to understand key processes as the cosmic history of baryons, feedback, reionization and metal enrichment of the intergalactic medium, This ambitious plan can be tackled by combining a new generation of physically-rich, high resolution, zoom simulations with data in the sub-mm bands provided by ALMA. This approach will be soon strengthened by the forthcoming JWST power. I will review the present status and the open questions in the field.

Chiara Caprini (APC Paris) - Cosmology with LISA

Vendredi 30 novembre 2018 11:00-12:00

Gravitational waves can constitute a unique probe of both the early and late-time universe. After a general introduction to the subject, this seminar focuses on the potential of the space-based interferometer LISA to test cosmology. In particular, two aspects will be discussed : the stochastic gravitational wave background generated by sources in the very early universe, and the use of compact binaries, emitting gravitational waves, as standard sirens, i.e. to probe the energy content and the acceleration of the late-time universe.

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