Planck intermediate results. VIII. Filaments between interacting clusters

Planck Collaboration, P A R Ade, N Aghanim, M Arnaud, M Ashdown, F Atrio-Barandela, J Aumont, C Baccigalupi, A Balbi, A J Banday, R B Barreiro, J G Bartlett E Battaner, K Benabed, A BenoÓt, J-P Bernard, M Bersanelli, R Bhatia, I Bikmaev, H Bˆhringer, A BonaldiJ R Bond, J Borrill, F R Bouchet, H Bourdin, R Burenin, C Burigana, P Cabella, J-F Cardoso, G Castex, A Catalano, L CayÛn, A Chamballu, R-R Chary, L-Y Chiang, G Chon, P R Christensen, D L Clements, S Colafrancesco, L P L Colombo, B Comis, A Coulais, B P Crill, F Cuttaia, L Danese, R J Davis, P de Bernardis, G de Gasperis, G de Zotti, J Delabrouille, J DÈmoclËs, F-X DÈsert, J M Diego, K Dolag, H Dole, S Donzelli, O DorÈ, U Dˆrl, M Douspis, X Dupac, G Efstathiou, T A Enfllin, H K Eriksen, F Finelli, I Flores-Cacho, O Forni, M Frailis, E Franceschi, M Frommert, K Ganga, T GÈnova-Santos, M Giard, M Gilfanov, Y Giraud-HÈraud, J Gonz·lez-Nuevo, K M GÛrski, A Gregorio, A Gruppuso, F K Hansen, D Harrison, A Hempel, S Henrot-VersillÈ, C Hern·ndez-Monteagudo, D Herranz, S R Hildebrandt, E Hivon, M Hobson, W A Holmes, W Hovest, G Hurier, T R Jaffe, A H Jaffe, T Jagemann, W C Jones, M Juvela, I Khamitov, T S Kisner, R Kneissl, J Knoche, L Knox, M Kunz, H Kurki-Suonio, G Lagache, J-M Lamarre, A Lasenby, C R Lawrence, M Le Jeune, R Leonardi, P B Lilje, M Linden-V¯rnle, M LÛpez-Caniego, P M Lubin, G Luzzi, J F MacÌas-PÈrez, B Maffei, D Maino, N Mandolesi, M Maris, F Marleau, D J Marshall, E MartÌnez-Gonz·lez, S Masi, M Massardi, S Matarrese, F Matthai, P Mazzotta, S Mei, A Melchiorri, J-B Melin, L Mendes, A Mennella, S Mitra, M-A Miville-DeschËnes, A Moneti, L Montier, G Morgante, D Munshi, J A Murphy, P Naselsky, F Nati, P Natoli, H U N¯rgaard-Nielsen, F Noviello, D Novikov, I Novikov, S Osborne, F Pajot, D Paoletti, F Pasian, G Patanchon, O Perdereau, L Perotto, F Perrotta, F Piacentini, M Piat, E Pierpaoli, R Piffaretti, S Plaszczynski, E Pointecouteau, G Polenta, N Ponthieu, L Popa, T Poutanen, G W Pratt, S Prunet, J-L Puget, J P Rachen, R Rebolo, M Reinecke, M Remazeilles, C Renault, S Ricciardi, T Riller, I Ristorcelli, G Rocha, M Roman, C Rosset, M Rossetti, J A RubiÒo-MartÌn, B Rusholme, M Sandri, G Savini, B M Schaefer, D Scott, G F Smoot, J-L Starck, R Sudiwala, R Sunyaev, D Sutton, A-S Suur-Uski, J-F Sygnet, J A Tauber, L Terenzi, L Toffolatti, M Tomasi, M Tristram, M Tucci, L Valenziano, B Van Tent, P Vielva, F Villa, N Vittorio, L A Wade, B D Wandelt, N Welikala, S D M White, D Yvon, A Zacchei, A Zonca

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Context. About half of the baryons of the Universe are expected to be in the form of filaments of hot and low-density intergalactic medium. Most of these baryons remain undetected even by the most advanced X-ray observatories, which are limited in sensitivity to the diffuse low-density medium.
    Aims: The Planck satellite has provided hundreds of detections of the hot gas in clusters of galaxies via the thermal Sunyaev-Zel'dovich (tSZ) effect and is an ideal instrument for studying extended low-density media through the tSZ effect. In this paper we use the Planck data to search for signatures of a fraction of these missing baryons between pairs of galaxy clusters.
    Methods: Cluster pairs are good candidates for searching for the hotter and denser phase of the intergalactic medium (which is more easily observed through the SZ effect). Using an X-ray catalogue of clusters and the Planck data, we selected physical pairs of clusters as candidates. Using the Planck data, we constructed a local map of the tSZ effect centred on each pair of galaxy clusters. ROSAT data were used to construct X-ray maps of these pairs. After modelling and subtracting the tSZ effect and X-ray emission for each cluster in the pair, we studied the residuals on both the SZ and X-ray maps.
    Results: For the merging cluster pair A399-A401 we observe a significant tSZ effect signal in the intercluster region beyond the virial radii of the clusters. A joint X-ray SZ analysis allows us to constrain the temperature and density of this intercluster medium. We obtain a temperature of kT = 7.1 ± 0.9 keV (consistent with previous estimates) and a baryon density of (3.7 ± 0.2) ◊ 10-4 cm-3.
    Conclusions: The Planck satellite mission has provided the first SZ detection of the hot and diffuse intercluster gas.
    Original languageEnglish
    Article numberA134
    JournalAstronomy and Astrophysics
    Volume550
    DOIs
    Publication statusPublished - 2013

    Keywords

    • Galaxies: clusters: general
    • Large-scale structure of Universe

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