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    Planck intermediate results XIII. Constraints on peculiar velocities

    Ade, P.A.R. and Aghanim, N. and Arnaud, M. and Ashdown, M. and Aumont, J. and Baccigalupi, C. and Balbi, A. and Banday, A.J. and Barreiro, R.B. and Battaner, E. and Benabed, K. and Benoit-Lévy, A. and Bernard, J.-P. and Bersanelli, M. and Bielewicz, P. and Bikmaev, I. and Bobin, J. and Bock, J.J. and Bonaldi, A. and Bond, J.R. and Borrill, J. and Bouchet, F.R. and Burigana, C. and Butler, R.C. and Cabella, P. and Cardoso, J.-F. and Catalano, A. and Chamballu, A. and Chiang, L.-Y. and Chon, G. and Christensen, P.R. and Clements, D.L. and Colombi, S. and Colombo, L.P.L. and Crill, B.P. and Cuttaia, F. and Da Silva, A. and Dahle, H. and Davies, R.D. and Davis, R.J. and De Bernardis, P. and de Gasperis, G. and de Zotti, G. and Delabrouille, J. and Démoclès, J. and Diego, J.M. and Dolag, K. and Dole, H. and Donzelli, S. and Dore, O. and Dorl, U. and Douspis, M. and Dupac, X. and Enßlin, T.A. and Finelli, F. and Flores-Cacho, I. and Forni, O. and Frailis, M. and Frommert, M. and Galeotta, S. and Ganga, K. and Genova-Santos, R.T. and Giard, M. and Giardino, G. and Gonzalez-Nuevo, J. and Gregorio, A. and Gruppuso, A. and Hansen, F.K. and Harrison, D. and Hernandez-Monteagudo, C. and Herranz, D. and Hildebrandt, S.R. and Hivon, E. and Holmes, W.A. and Hovest, W. and Huffenberger, K.M. and Hurier, G. and Jaffe, A.H. and Jaffe, T.R. and Jasche, J. and Jones, W.C. and Juvela, M. and Keihanen, E. and Keskitalo, R. and Khamitov, I. and Kisner, T.S. and Knoche, J. and Kunz, M. and Kurki-Suonio, H. and Lagache, G. and Lahteenmaki, A. and Lamarre, J.-M. and Lasenby, A. and Lawrence, C.R. and Le Jeune, M. and Leonardi, R. and Lilje, P.B. and Linden-Vornle, M. and Lopez-Caniego, M. and Macias-Perez, J.F. and Maino, D. and Mak, D.S.Y. and Mandolesi, N. and Maris, M. and Marleau, F. and Martinez-Gonzalez, E. and Masi, S. and Matarrese, S. and Mazzotta, P. and Melchiorri, A. and Melin, J.-B. and Mendes, L. and Mennella, A. and Migliaccio, M. and Mitra, S. and Miville-Deschenes, M.-A. and Moneti, A. and Montier, L. and Morgante, G. and Mortlock, D. and Moss, A. and Munshi, D. and Murphy, J.Anthony and Naselsky, P. and Nati, F. and Natoli, P. and Netterfield, C.B. and Norgaard-Nielsen, H.U. and Noviello, F. and Novikov, D. and Novikov, I. and Osborne, S. and Pagano, L. and Paoletti, D. and Perdereau, O. and Perrotta, F. and Piacentini, F. and Piat, M. and Pierpaoli, E. and Pietrobon, D. and Plaszczynski, S. and Pointecouteau, E. and Polenta, G. and Popa, L. and Poutanen, T. and Pratt, G.W. and Prunet, S. and Puget, J.-L. and Puisieux, S. and Rachen, J.P. and Rebolo, R. and Reinecke, M. and Remazeilles, M. and Renault, C. and Ricciardi, S. and Roman, M. and Rubino-Martin, J.A. and Rusholme, B. and Sandri, M. and Savini, G. and Scott, D. and Spencer, L. and Sunyaev, R. and Sutton, D. and Suur-Uski, A.-S. and Sygnet, J.-F. and Tauber, J.A. and Terenzi, L. and Toffolatti, L. and Tomasi, M. and Tristram, M. and Tucci, M. and Valenziano, L. and Valiviita, J. and Van Tent, B. and Vielva, P. and Villa, F. and Vittorio, N. and Wade, L.A. and Welikala, N. and Yvon, D. and Zacchei, A. and Zibin, J.P. and Zonca, A. (2014) Planck intermediate results XIII. Constraints on peculiar velocities. Astronomy & Astrophysics, 561 (A97). ISSN 0004-6361

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    Using Planck data combined with the Meta Catalogue of X-ray detected Clusters of galaxies (MCXC), we address the study of peculiar motions by searching for evidence of the kinetic Sunyaev-Zeldovich effect (kSZ). By implementing various filters designed to extract the kSZ generated at the positions of the clusters, we obtain consistent constraints on the radial peculiar velocity average, root mean square (rms), and local bulk flow amplitude at different depths. For the whole cluster sample of average redshift 0.18, the measured average radial peculiar velocity with respect to the cosmic microwave background (CMB) radiation at that redshift, i.e., the kSZ monopole, amounts to 72 ± 60 km s-1. This constitutes less than 1% of the relative Hubble velocity of the cluster sample with respect to our local CMB frame. While the linear ΛCDM prediction for the typical cluster radial velocity rms at z = 0.15 is close to 230 km s-1, the upper limit imposed by Planck data on the cluster subsample corresponds to 800 km s-1 at 95% confidence level, i.e., about three times higher. Planck data also set strong constraints on the local bulk flow in volumes centred on the Local Group. There is no detection of bulk flow as measured in any comoving sphere extending to the maximum redshift covered by the cluster sample. A blind search for bulk flows in this sample has an upper limit of 254 km s-1 (95% confidence level) dominated by CMB confusion and instrumental noise, indicating that the Universe is largely homogeneous on Gpc scales. In this context, in conjunction with supernova observations, Planck is able to rule out a large class of inhomogeneous void models as alternatives to dark energy or modified gravity. The Planck constraints on peculiar velocities and bulk flows are thus consistent with the ΛCDM scenario.

    Item Type: Article
    Keywords: Planck Collaboration; cosmology: observations; cosmic background radiation; large-scale structure of Universe; galaxies: clusters: general;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 14254
    Identification Number:
    Depositing User: Dr. Anthony Murphy
    Date Deposited: 24 Mar 2021 16:37
    Journal or Publication Title: Astronomy & Astrophysics
    Publisher: EDP Sciences
    Refereed: Yes

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