title: A flat Universe from high-resolution maps of the cosmic microwave background radiation
abstract: The blackbody radiation left over from the Big Bang has been transformed by the expansion of the Universe into the nearly isotropic 2.73 K cosmic microwave background. Tiny inhomogeneities in the early Universe left their imprint on the microwave background in the form of small anisotropies in its temperature. These anisotropies contain information about basic cosmological parameters, particularly the total energy density and curvature of the Universe. Here we report the first images of resolved structure in the microwave background anisotropies over a significant part of the sky. Maps at four frequencies clearly distinguish the microwave background from foreground emission. We compute the angular power spectrum of the microwave background, and find a peak at Legendre multipole Ipeak = (197 +/- 6), with an amplitude delta T200 = (69 +/- 8) microK. This is consistent with that expected for cold dark matter models in a flat (euclidean) Universe, as favoured by standard inflationary models.
authors.affiliation: Dipartimento di Fisica, Universita' di Roma La Sapienza, Italy. debernardis@roma1.infn.it
authors.lastname: de Bernardis P
authors.initials: PA
authors.lastname: Ade
authors.initials: JJ
authors.lastname: Bock
authors.initials: JR
authors.lastname: Bond
authors.initials: J
authors.lastname: Borrill
authors.initials: A
authors.lastname: Boscaleri
authors.initials: K
authors.lastname: Coble
authors.initials: BP
authors.lastname: Crill
authors.lastname: De Gasperis G
authors.initials: PC
authors.lastname: Farese
authors.initials: PG
authors.lastname: Ferreira
authors.initials: K
authors.lastname: Ganga
authors.initials: M
authors.lastname: Giacometti
authors.initials: E
authors.lastname: Hivon
authors.initials: VV
authors.lastname: Hristov
authors.initials: A
authors.lastname: Iacoangeli
authors.initials: AH
authors.lastname: Jaffe
authors.initials: AE
authors.lastname: Lange
authors.initials: L
authors.lastname: Martinis
authors.initials: S
authors.lastname: Masi
authors.initials: PV
authors.lastname: Mason
authors.initials: PD
authors.lastname: Mauskopf
authors.initials: A
authors.lastname: Melchiorri
authors.initials: L
authors.lastname: Miglio
authors.initials: T
authors.lastname: Montroy
authors.initials: CB
authors.lastname: Netterfield