logo observatoire

SÉMINAIRE DU LERMA
OBSERVATOIRE DE PARIS
logo lerma



Vendredi 7 juin 2002, à 14h,


77 avenue Denfert Rochereau, Paris 14



!!!! Salle de l'Atelier !!!!





INFLUENCE OF MAGNETIC FIELDS ON THE SUNYAEV-ZEL'DOVICH EFFECT IN CLUSTERS OF GALAXIES.



KOCH Patrick

Institute of Theoretical Physics, Zurich



Résumé : we assume a spherically symmetric, isothermal cluster model. Adding a magnetic field pressure term to the hydrostatic equilibrium equation, we calculate the new electron density profile. This profile can be written as the product of the standard density profile (i.e. an isothermal beta profile) and a radius dependent function which takes properly into account the magnetic field. We find that magnetic fields can reduce the SZ-signal by about 10% for non cooling flow clusters. A similar calculation holds for cooling flow clusters.