Archeops results

. A RCHEOPS is a balloon–borne instrument dedicated to measuring cosmic microwave background (CMB) temperature anisotropies at high angular resolution ( ∼ 12 arcmin.) over a large fraction (30%) of the sky in the (sub)millimetre domain (from 143 to 545 GHz). We describe the results obtained during the last flight: the A RCHEOPS estimate of the CMB angular power spectrum linking for the first time C OBE scales and the first acoustic peak, consequences in terms of cosmological parementers favouring a flat- Λ Universe. We also present the first measurement of galactic dust polarization and accurate maps of the galactic plane diffuse (sub) millimetre emisson. c (cid:13) 2003 Acad´emie des sciences