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Title

Planck 2013 results. XXVII. Doppler boosting of the CMB: Eppur si muove

AuthorsScott, D.; Barreiro, R. Belén ; Curto, Andrés ; Diego, José María ; González-Nuevo, J. ; López-Caniego, M. ; Martínez-González, Enrique ; Rebolo López, Rafael; Toffolatti, L. ; Vielva, P. ; Planck Collaboration
KeywordsReference systems
Relativistic processes
Cosmic background radiation
Cosmology: observations
Issue Date2014
PublisherEDP Sciences
CitationAstronomy and Astrophysics 571: A27 (2014)
AbstractOur velocity relative to the rest frame of the cosmic microwave background (CMB) generates a dipole temperature anisotropy on the sky which has been well measured for more than 30 years, and has an accepted amplitude of v/c = 1.23 × 10-3, or v = 369. In addition to this signal generated by Doppler boosting of the CMB monopole, our motion also modulates and aberrates the CMB temperature fluctuations (as well as every other source of radiation at cosmological distances). This is an order 10-3 effect applied to fluctuations which are already one part in roughly 105, so it is quite small. Nevertheless, it becomes detectable with the all-sky coverage, high angular resolution, and low noise levels of the Planck satellite. Here we report a first measurement of this velocity signature using the aberration and modulation effects on the CMB temperature anisotropies, finding a component in the known dipole direction, (l,b) = (264°,48°), of 384 km s-1 ± 78 km s-1 (stat.) ± 115 km s-1 (syst.). This is a significant confirmation of the expected velocity.
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361/201321556
URIhttp://hdl.handle.net/10261/110630
DOIhttp://dx.doi.org/10.1051/0004-6361/201321556
Identifiersdoi: 10.1051/0004-6361/201321556
issn: 0004-637X
e-issn: 1432-0746
Appears in Collections:(IFCA) Artículos
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