Measurement of a large scale flow with clusters of galaxies

Prof. Fernando Atrio Barandela

Abstract

Peculiar velocities of galaxies, derived using distance estimators, are plagued with systematic effects and are unreliable beyond 100 Mpc/h. In Kashlinsky & Atrio-Barandela (2000) we proposed to measure peculiar velocities of clusters of galaxies using the temperature anisotropies on the Cosmic Microwave Background generated by the hot X-ray emitting. Using this technique we have recently found a bulk flow velocity of amplitude 600-1000 km/s in the same direction as the CMB dipole and encompassing a sphere of 300 Mpc/h radius. We shall discuss the cosmological implications of this measurement.

About the talk

Measurement of a large scale flow with clusters of galaxies
Prof. Fernando Atrio Barandela
University of Salamanca, Spain
Friday January 16, 2009 - 0:00  (Aula)
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