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

  • Y. Akrami
  • , M. Ashdown
  • , J. Aumont
  • , C. Baccigalupi
  • , M. Ballardini
  • , A. J. Banday
  • , R. B. Barreiro
  • , N. Bartolo
  • , S. Basak
  • , K. Benabed
  • , J. P. Bernard
  • , M. Bersanelli
  • , P. Bielewicz
  • , J. R. Bond
  • , J. Borrill
  • , F. R. Bouchet
  • , C. Burigana
  • , E. Calabrese
  • , J. F. Cardoso
  • , B. Casaponsa
  • H. C. Chiang, C. Combet, D. Contreras, B. P. Crill, F. Cuttaia, P. De Bernardis, A. De Rosa, G. De Zotti, J. Delabrouille, E. Di Valentino, J. M. Diego, O. Doré, M. Douspis, X. Dupac, T. A. Enßlin, H. K. Eriksen, R. Fernandez-Cobos, F. Finelli, M. Frailis, E. Franceschi, A. Frolov, S. Galeotta, S. Galli, K. Ganga, R. T. Génova-Santos, M. Gerbino, J. González-Nuevo, K. M. Górski, A. Gruppuso, J. E. Gudmundsson, W. Handley, D. Herranz, E. Hivon, Z. Huang, A. H. Jaffe, W. C. Jones, E. Keihänen, R. Keskitalo, K. Kiiveri, J. Kim, T. S. Kisner, N. Krachmalnicoff, M. Kunz, H. Kurki-Suonio, J. M. Lamarre, M. Lattanzi, C. R. Lawrence, M. Le Jeune, F. Levrier, M. Liguori, P. B. Lilje, V. Lindholm, M. López-Caniego, J. F. Maciás-Pérez, 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, L. Montier, G. Morgante, A. Moss, P. Natoli, L. Pagano, D. Paoletti, F. Perrotta, V. Pettorino, F. Piacentini, G. Polenta, J. P. Rachen, M. Reinecke, M. Remazeilles, A. Renzi, G. Roha, C. Roset, J. A. Rubiño-Martín, B. Ruiz-Granados, L. Salvati, M. Savelainen, D. Scott, 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, P. Vielva, F. Villa, N. Vittorio, I. K. Wehus, A. Zacchei, A. Zonca

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article numberA100
JournalAstronomy and Astrophysics
Volume644
DOIs
Publication statusPublished - 1 Dec 2020

Bibliographical note

Funding Information: Acknowledgements. The Planck Collaboration acknowledges the support of: ESA; CNES and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MINECO, JA, and RES (Spain); Tekes, AoF, and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); and ERC and PRACE (EU). A description of the Planck Collaboration and a list of its members, indicating which technical or scientific activities they have been involved in, can be found at http://www.cosmos.esa.int/web/planck/ planck-collaboration. Some of the results in this paper have been derived using the HEALPix package and the NaMaster package and some plots were generated using the pygtc package. Funding Information: ★ Corresponding author: R. M. Sullivan, e-mail: [email protected] 1 Planck (http://www.esa.int/Planck) is a project of the European Space Agency (ESA) with instruments provided by two scientific consortia funded by ESA member states and led by Principal Investigators from France and Italy, telescope reflectors provided through a collaboration between ESA and a scientific consortium led and funded by Denmark, and additional contributions from NASA (USA). Publisher Copyright: © ESO 2020.

Other keywords

  • Cosmic background radiation
  • Cosmology: observations
  • Reference systems
  • Relativistic processes

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