Cosmologie

Euclid Clusters - a joint meeting of the Cluster SWG & OU-LE3

 

Euclid will greatly advance galaxy cluster science, in both cosmology and astrophysics, by providing a large catalog of clusters extending to redshifts well beyond unity and with high quality gravitational lensing measurements. This is a joint meeting of the Galaxy Cluster Science Working Group (SWG) and OU-LE3 group of the science ground segment. The meeting will cover critical areas of on-going work in the preparation of mission data analysis.

Cosmologie WG, GdR Ondes gravitationnelles

La prochaine réunion du groupe de travail Cosmologie des ondes gravitationnelles GdR se tiendra le 13 novembre prochain à APC, 10 rue Alice Domon et Léonie Duquet, dans le 13ème arrondissement de Paris.

S'il vous plaît, marquez dans votre agenda et inscrivez-vous sur la page web indico ! Veuillez noter que même si vous n'êtes pas inscrit en tant que membre du GdR, vous êtes les bienvenus (et vous pouvez vous inscrire au GdR si vous le souhaitez !). Vous êtes également encouragé à transmettre ce courriel à toute personne susceptible d'être intéressée.

Kinetic Inductance Detectors (KIDs)

Kinetic inductance detector (KID) is a promising technology for astronomy with high sensitivity, microsecond timing and intrinsic multiplexing readout properties. Based on these advantages, a wide range of application has been proposed from millimeter to X-ray. With simple fabrication and frequency domain multiplexing readout, hundreds of KID pixels could be easily read out with single cable. In the last decade, KID has been developed rapidly. This talk will introduce the recent development of KIDs for frequency range from 100 GHz to 1 THz.

Studying black hole populations with gravitational-wave observations

The first observations of gravitational waves emitted by merging binary black holes demonstrated the existence of black holes more massive than ever observed in our Galaxy. Future observations with ground-based interferometers such as Advanced LIGO and Virgo will probe the mass and spin distributions of black holes in various galactic environments and may also detect the stochastic gravitational-wave background from unresolved mergers. These measurements will provide a new tool for stellar and galaxy evolution studies.

Physics of Gravitational Redshifts in Clusters of Galaxies

Wojtak, Hansen and Hjorth and others have measured the long-predicted gravitational redshift of light escaping from galaxy clusters.  The effect is very small, corresponding to a velocity shift of only ~10 km/s, but the result appears to be fairly robust and seemed to be in good agreement with general relativity predictions and possibly in conflict with some alternative theories. The effect was initially imagined to be a simple astronomical analogue of the famous terrestrial Pound and Rebka experiment that verified Einstein's theoretical prediction.

The Dark Energy Survey Supernova Program and the Australian OzDES survey

The Dark Energy Survey (DES) is using four probes to investigate the dynamics of the expansion of the Universe. The DES Supernova Program (DES-SN) is observing 27 square degrees with a 6-day cadence to obtain a large sample of type Ia supernovae for cosmology. In collaboration with DES, OzDES is using the AAT to obtain redshifts and classifications for objects in the DES fields.

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