Title: Are CMB derived cosmological parameters affected by foregrounds associated to nearby galaxies?

Place: Seminar del DAA. Jeroni Muñoz Research Building, fourth floor, in Burjassot.

Day: Fryday, june 13, 2025. Time: 12.00.

Abstract:

A new unknown extragalactic foreground of the cosmic microwave background (CMB) has recently been detected. This signal shows a systematic decrease in CMB temperatures around nearby large spiral galaxies, pointing to an interaction with CMB photons up to several projected Mpc around these galaxies. We investigate to what extent this foreground may impact the CMB fluctuation map and the cosmological parameters.