A. Mennella

Learn More
We report the results of a joint analysis of data from BICEP2/Keck Array and Planck. BICEP2 and Keck Array have observed the same approximately 400  deg^{2} patch of sky centered on RA 0 h, Dec. -57.5°. The combined maps reach a depth of 57 nK deg in Stokes Q and U in a band centered at 150 GHz. Planck has observed the full sky in polarization at seven(More)
Measurements of the cosmic microwave background (CMB) allow high precision observation of the cosmic plasma at redshift z ∼1100. After the success of the NASA satellite COBE, that in 1992 provided the first detection of the CMB anisotropy, results from many ground-based and balloon-borne experiments have showed a remarkable consistency between different(More)
Signal digitisation may produce significant effects in balloon-borne or space CMB experiments, when the limited bandwidth for downlink of data requires for loss-less data compression. In fact, the data compressibilty depends on the quantisation step q applied on board by the instrument acquisition chain. In this paper we present a study of the impact of the(More)
A detailed knowledge of the Galactic radio continuum is of high interest for studies of the dynamics and structure of the Galaxy as well as for the problem of foreground removal in Cosmic Microwave Background measurements. In this work we present a full-sky study of the diffuse Galactic emission at frequencies of few GHz, where synchrotron radiation is by(More)
We report on the design, fabrication and testing of a set of high performance corrugated feed horns at 30 GHz, 70 GHz and 100 GHz, built as advanced prototypes for the Low Frequency Instrument (LFI) of the ESA Planck mission. The electromagnetic designs include linear (100 GHz) and dual shaped (30 and 70 GHz) profiles. Fabrication has been achieved by(More)
Accurate measurements of the Cosmic Microwave Background (CMB) anisotropy call for high precision and reliability of the in-flight calibration. For extended surveys the CMB dipole provides an excellent calibration source at frequencies lower than ∼ 200 GHz; however poorly known foreground emissions, such as diffuse galactic components, complicate the signal(More)
  • Planck Collaboration, J Aatrokoski, P A R Ade, N Aghanim, M Arnaud, M Ash-Down +234 others
  • 2012
project of the European Space Agency ESA with instruments provided by two scientific Consortia funded by ESA member states (in particular the lead countries: France and Italy) with contributions from NASA (USA), and telescope reflectors provided in a collaboration between ESA and a scientific Consortium led and funded by Denmark.
To asses stability against 1/ f noise, the Low Frequency Instrument (LFI) on–board the Planck mission will acquire data at a rate much higher than the data rate allowed by the science telemetry bandwith of 35.5 kbps. The data are processed by an on–board pipeline, followed on– ground by a decoding and reconstruction step, to reduce the volume of data to a(More)
Short title Challenges and perspectives in the observation of CMB anisotropy 1 ABSTRACT Measurements of the cosmic microwave background (CMB) allow high precision observation of the Last Scattering Surface at redshift z ∼1100. After the success of the NASA satellite COBE, that in 1992 provided the first detection of the CMB anisotropy, results from many(More)