Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003tsra.symp...45d&link_type=abstract
TEXAS IN TUSCANY. Proceedings of the XXI Symposium on Relativistic Astrophysics. Held 9-13 December 2002 in Florence, Italy. Edi
Astronomy and Astrophysics
Astrophysics
Cosmic Microwave Background, Anisotropies, Balloon Experiments
Scientific paper
ARCHEOPS is a balloon-borne instrument dedicated to measuring cosmic microwave background (CMB) temperature anisotropies. It has a high angular resolution (about 10 arcminutes) in order to constrain high ℓ multipoles, as well as a large sky coverage fraction (30%) in the millimetre domain (from 143 to 545 GHz) in order to minimize the cosmic variance. This is achieved with fast 0.1 K bolometers and cold optics with a design very similar to PLANCK - HFI. They view a well-baffled 1.5 m off-axis telescope pointing at 41 degree elevation. The gondola at a float altitude above 35 km spins across the sky at a rate of 2 rpm which, combined with the Earth rotation, makes a well sampled sky map. We report on the first results obtained from the last flight (12.5 dark hours) that happened from Kiruna (Sweden) to Russia in February 2002. The white noise sensitivity for the 8 best bolometers is measured below 200 μKCMB S1/2 per bolometer. The CMB power spectrum is obtained for ℓ values ranging from 20 to 350 with an unprecedented sensitivity. It connects, in a single experiment, COBE large angular scales to the first acoustic peak region. Taken all together, the CMB experiments show good consistency. Consequences on the cosmological parameters are also addressed. With priors on the Hubble constant and the optical depth to reionisation τ, inflation motivated cosmologies are reinforced with a total density equal to 1 (i.e. a flat Universe) within 3 percent, the spectral index of scalar perturbation n being 0.96 ± 0.03 and the baryonic density is in very good agreement with other independent estimates based on big bang nucleosynthesis.
Archeops Collaboration
Desert François Xavier
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