Planck intermediate results. LVI. Detection of the CMB dipole through modulation of the thermal Sunyaev-Zeldovich effect: Eppur si muove II

Yashar Akrami (1, 2, 3) , M. Ashdown , J. Aumont (4) , C. Baccigalupi , M. Ballardini , A. J. Banday (4) , R. B. Barreiro , N. Bartolo , S. Basak , K. Benabed (5) , J.-P. Bernard (4) , M. Bersanelli , P. Bielewicz , J. R. Bond , J. Borrill , F. R. Bouchet (5) , C. Burigana , E. Calabrese , J.-F. Cardoso (5) , B. Casaponsa , H. C. Chiang , C. Combet (6) , D. Contreras , B. P. Crill , F. Cuttaia , P. de Bernardis , A. de Rosa , G. de Zotti , J. Delabrouille (7) , E. Di Valentino , J. M. Diego , O. Doré , M. Douspis (8) , X. Dupac , T. A. Ensslin , H. K. Eriksen , R. Fernandez-Cobos , F. Finelli , M. Frailis , E. Franceschi , A. Frolov , S. Galeotta , S. Galli (5) , K. Ganga (7) , R. T. Génova-Santos , M. Gerbino , J. González-Nuevo , K. M. Górski , A. Gruppuso , J. E. Gudmundsson (9, 10) , W. Handley , D. Herranz , E. Hivon (5) , Z. Huang , A. H. Jaffe , W. C. Jones , E. Keihänen , R. Keskitalo , K. Kiiveri , J. Kim , T. S. Kisner , N. Krachmalnicoff , M. Kunz (8) , H. Kurki-Suonio , J.-M. Lamarre (11) , M. Lattanzi , C. R. Lawrence , M. Le Jeune (7) , F. Levrier (11, 3) , M. Liguori , P. B. Lilje , V. Lindholm , M. López-Caniego , J. F. Macías-Pérez (6) , D. Maino , N. Mandolesi , A. Marcos-Caballero , M. Maris , P. G. Martin , E. Martínez-González , S. Matarrese , N. Mauri , J. D. Mcewen , A. Mennella , M. Migliaccio , D. Molinari , A. Moneti (12) , L. Montier (4) , G. Morgante , A. Moss , P. Natoli , L. Pagano (8) , D. Paoletti , F. Perrotta , V. Pettorino (13) , F. Piacentini , G. Polenta , J. P. Rachen , M. Reinecke , M. Remazeilles , A. Renzi , G. Roha , C. Rosset (7) , J. A. Rubiño-Martín , B. Ruiz-Granados , L. Salvati , M. Savelainen , D. Scott (14) , C. Sirignano , G. Sirri , L. D. Spencer , R. M. Sullivan , R. Sunyaev , A.-S. Suur-Uski , J. A. Tauber , D. Tavagnacco , M. Tenti , L. Toffolatti , M. Tomasi , T. Trombetti , J. Valiviita , B. van Tent (15) , P. Vielva , Francesca Villa , N. Vittorio , I. K. Wehus , A. Zacchei , A. Zonca

1 Universiteit Leiden = Leiden University
2 UiO - University of Oslo
3 Astrophysique
4 IRAP - Institut de recherche en astrophysique et planétologie
5 IAP - Institut d'Astrophysique de Paris
6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
7 APC (UMR_7164) - AstroParticule et Cosmologie
8 IAS - Institut d'astrophysique spatiale
9 Princeton University
10 Oskar Klein Centre [Stockholm]
11 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres
12 IAP - Institut d'Astrophysique de Paris
13 AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
14 UBC - University of British Columbia
15 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]

The largest temperature anisotropy in the cosmic microwave background (CMB) is the dipole, which has been measured with increasing accuracy for more than three decades, particularly with the Planck satellite. The simplest interpretation of the dipole is that it is due to our motion with respect to the rest frame of the CMB. Since current CMB experiments infer temperature anisotropies from angular intensity variations, the dipole modulates the temperature anisotropies with the same frequency dependence as the thermal Sunyaev-Zeldovich (tSZ) effect. We present the first, and significant, detection of this signal in the tSZ maps and find that it is consistent with direct measurements of the CMB dipole, as expected. The signal contributes power in the tSZ maps, which is modulated in a quadrupolar pattern, and we estimate its contribution to the tSZ bispectrum, noting that it contributes negligible noise to the bispectrum at relevant scales.

Mots clés: cosmic background radiation; cosmology: observations; relativistic processes; reference systems

Domaines: Astrophysique [astro-ph]

Yashar Akrami, M. Ashdown, J. Aumont, C. Baccigalupi, M. Ballardini, et al.. Planck intermediate results. LVI. Detection of the CMB dipole through modulation of the thermal Sunyaev-Zeldovich effect: Eppur si muove II. Astronomy and Astrophysics - A&A, 2020, 644, pp.A100. ⟨10.1051/0004-6361/202038053⟩. ⟨cea-03065755⟩