Data di Pubblicazione:
2014
Abstract:
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 LambdaCDM 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 LambdaCDM scenario.
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 LambdaCDM 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 LambdaCDM scenario.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
cosmology: observations; cosmic background radiation; large-scale structure of Universe; galaxies: clusters: general
Elenco autori:
P., Collaboration; P. A., R.; N., Aghanim; M., Arnaud; M., Ashdown; J., Aumont; C., Baccigalupi; A., Balbi; A. J., Banday; R. B., Barreiro; E., Battaner; K., Benabed; A., Benoit L�vy; J., Bernard; M., Bersanelli; P., Bielewicz; I., Bikmaev; J., Bobin; J. J., Bock; A., Bonaldi; J. R., Bond; J., Borrill; F. R., Bouchet; C., Burigana; R. C., Butler; P., Cabella; J., Cardoso; A., Catalano; A., Chamballu; L., Chiang; G., Chon; P. R., Christensen; D. L., Clements; S., Colombi; L. P., L.; B. P., Crill; F., Cuttaia; A. D., Silva; H., Dahle; R. D., Davies; R. J., Davis; P. d., Bernardis; G. d., Gasperis; G. d., Zotti; J., Delabrouille; J., D�mocl�s; J. M., Diego; K., Dolag; H., Dole; S., Donzelli; O., Dor�; U., D�rl; M., Douspis; X., Dupac; T. A., En�lin; F., Finelli; I., Flores Cacho; O., Forni; M., Frailis; M., Frommert; S., Galeotta; K., Ganga; R. T., G�nova Santos; M., Giard; G., Giardino; J., Gonz�alez Nuevo; A., Gregorio; A., Gruppuso; F. K., Hansen; D., Harrison; C., Hern�ndez Monteagudo; D., Herranz; S. R., Hildebrandt; E., Hivon; W. A., Holmes; W., Hovest; K. M., Huffenberger; G., Hurier; T. R., Jaffe; A. H., Jaffe; J., Jasche; W. C., Jones; M., Juvela; E., Keih�nen; R., Keskitalo; I., Khamitov; T. S., Kisner; J., Knoche; M., Kunz; H., Kurki Suonio; G., Lagache; A., L�hteenm�ki; J., Lamarre; A., Lasenby; C. R., Lawrence; M. L., Jeune; R., Leonardi; P. B., Lilje; M., Linden V�rnle; M., L�pez Caniego; J. F., Mac�as P�rez; D., Maino; D. S., Y.; N., Mandolesi; M., Maris; F., Marleau; E., Mart�nez Gonz�lez; S., Masi; S., Matarrese; P., Mazzotta; A., Melchiorri; J., Melin; L., Mendes; A., Mennella; M., Migliaccio; S., Mitra; M., Miville Desch�nes; A., Moneti; L., Montier; G., Morgante; D., Mortlock; A., Moss; D., Munshi; J. A., Murphy; P., Naselsky; F., Nati; P., Natoli; C. B., Netterfield; H. U., N�rgaard Nielsen; F., Noviello; D., Novikov; I., Novikov; S., Osborne; L., Pagano; D., Paoletti; O., Perdereau; F., Perrotta; F., Piacentini; M., Piat; E., Pierpaoli; D., Pietrobon; S., Plaszczynski; E., Pointecouteau; G., Polenta; L., Popa; T., Poutanen; G. W., Pratt; S., Prunet; J., Puget; S., Puisieux; J. P., Rachen; R., Rebolo; M., Reinecke; M., Remazeilles; C., Renault; S., Ricciardi; M., Roman; Mart�n, J. A. Rubi�o.; B., Rusholme; M., Sandri; G., Savini; D., Scott; L., Spencer; R., Sunyaev; D., Sutton; A., Suur Uski; J., Sygnet; J. A., Tauber; Terenzi, Luca; L., Toffolatti; M., Tomasi; M., Tristram; M., Tucci; L., Valenziano; J., Valiviita; B. V., Tent; P., Vielva; F., Villa; N., Vittorio; L. A., Wade; N., Welikala; D., Yvon; A., Zacchei; J. P., Zibin; A., Zonca
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