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    Planck intermediate results X. Physics of the hot gas in the Coma cluster


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    Ade, P.A.R., Aghanim, N., Arnaud, M., Ashdown, M., Atrio-Barandela, F., Aumont, J., Baccigalupi, C., Balbi, A., Banday, A.J., Barreiro, R.B., Bartlett, J.G., Battaner, E., Benabed, K., Benoit, A., Bernard, J.-P., Bersanelli, M., Bikmaev, I., Böhringer, H., Bonaldi, A., Bond, J.R., Borrill, J., Bouchet, F.R., Bourdin, H., Brown, M.L., brown, S.D., Burenin, R., Burigana, C., Cabella, P., Cardoso, J.-F., Carvalho, P., Catalano, A., Cayon, L., Chiang, L.-Y., Chon, G., Christensen, P.R., Churazov, E., Clements, D.L., Colafrancesco, S., Colombo, L.P.L., Coulais, A., Crill, B.P., Cuttaia, F., Da Silva, A., Dahle, H., Danese, L., Davis, R.J., De Bernardis, P., de Gasperis, G., de Rosa, A., de Zotti, G., Delabrouille, J., Démoclès, J., Desert, F.-X., Dickinson, C., Diego, J.M., Dolag, K., Dole, H., Donzelli, S., Dore, O., Dorl, U., Douspis, M., Dupac, X., Enßlin, T.A., Eriksen, H.K., Finelli, F., Flores-Cacho, I., Forni, O., Frailis, M., Franceschi, E., Frommert, M., Galeotta, S., Ganga, K., Genova-Santos, R.T., Giard, M., Gilfanov, M., Gonzalez-Nuevo, J., Gorski, K.M., Gregorio, A., Gruppuso, A., Hansen, F.K., Harrison, D., Henrot-Versille, S., Hernandez-Monteagudo, C., Hildebrandt, S.R., Hivon, E., Hobson, M., Holmes, W.A., Hornstrup, A., Hovest, W., Huffenberger, K.M., Hurier, G., Jaffe, T.R., Jagemann, T., Jones, W.C., Juvela, M., Keihanen, E., Khamitov, I., Kneissl, R., Knoche, J., Knox, L., Kunz, M., Kurki-Suonio, H., Lagache, G., Lahteenmaki, A., Lamarre, J.-M., Lasenby, A., Lawrence, C.R., Le Jeune, M., Leonardi, R., Lilje, P.B., Linden-Vornle, M., Lopez-Caniego, M., Lubin, P.M., Macias-Perez, J.F., Maffei, B., Maino, D., Mandolesi, N., Maris, M., Marleau, F., Martinez-Gonzalez, E., Masi, S., Massardi, M., Matarrese, S., Matthai, F., Mazzotta, P., Mei, S., Melchiorri, A., Melin, J.-B., Mendes, L., Mennella, A., Mitra, S., Miville-Deschenes, M.-A., Moneti, A., Montier, L., Morgante, G., Munshi, D., Murphy, J.Anthony, Naselsky, P., Natoli, P., Norgaard-Nielsen, H.U., Noviello, F., Novikov, D., Novikov, I., Osborne, S., Pajot, F., Paoletti, D., Perdereau, O., Perrotta, F., Piacentini, F., Piat, M., Pierpaoli, E., Piffaretti, R., Plaszczynski, S., Pointecouteau, E., Polenta, G., Ponthieu, N., Popa, L., Poutanen, T., Pratt, G.W., Prunet, S., Puget, J.-L., Rachen, J.P., Rebolo, R., Reinecke, M., Remazeilles, M., Renault, C., Ricciardi, S., Riller, T., Ristorcelli, I., Rocha, G., Roman, M., Rosset, C., Rossetti, M., Rubino-Martin, J.A., Rudnick, L., Rusholme, B., Sandri, M., Savini, G., Schaefer, B.M., Scott, D., Smoot, G.F., Stivoli, F., Sudiwala, R., Sunyaev, R., Sutton, D., Suur-Uski, A.-S., Sygnet, J.-F., Tauber, J.A., Terenzi, L., Toffolatti, L., Tomasi, M., Tristram, M., Tuovinen, J., Turler, M., Umana, G., Valenziano, L., Van Tent, B., Varis, J., Vielva, P., Villa, F., Vittorio, N., Wade, L.A., Wandelt, B.D., Welikala, N., White, S.D.M., Yvon, D., Zacchei, A., Zaroubi, S. and Zonca, A. (2013) Planck intermediate results X. Physics of the hot gas in the Coma cluster. Astronomy & Astrophysics, 554 (A140). ISSN 0004-6361

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    Abstract

    We present an analysis of Planck satellite data on the Coma cluster observed via the Sunyaev-Zeldovich effect. Thanks to its great sensitivity, Planck is able, for the first time, to detect SZ emission up to r ≈ 3 × R500. We test previously proposed spherically symmetric models for the pressure distribution in clusters against the azimuthally averaged data. In particular, we find that the Arnaud et al. (2010, A&A, 517, A92) “universal” pressure profile does not fit Coma, and that their pressure profile for merging systems provides a reasonable fit to the data only at r < R500; by r = 2 × R500 it underestimates the observed y profile by a factor of ≃2. This may indicate that at these larger radii either: i) the cluster SZ emission is contaminated by unresolved SZ sources along the line of sight; or ii) the pressure profile of Coma is higher at r > R500 than the mean pressure profile predicted by the simulations used to constrain the models. The Planck image shows significant local steepening of the y profile in two regions about half a degree to the west and to the south-east of the cluster centre. These features are consistent with the presence of shock fronts at these radii, and indeed the western feature was previously noticed in the ROSAT PSPC mosaic as well as in the radio. Using Plancky profiles extracted from corresponding sectors we find pressure jumps of 4.9-0.2+0.4 and 5.0-0.1+1.3 in the west and south-east, respectively. Assuming Rankine-Hugoniot pressure jump conditions, we deduce that the shock waves should propagate with Mach number Mw = 2.03-0.04+0.09 and Mse = 2.05-0.02+0.25 in the west and south-east, respectively. Finally, we find that the y and radio-synchrotron signals are quasi-linearly correlated on Mpc scales, with small intrinsic scatter. This implies either that the energy density of cosmic-ray electrons is relatively constant throughout the cluster, or that the magnetic fields fall off much more slowly with radius than previously thought.
    Item Type: Article
    Keywords: Planck Collaboration; galaxies: clusters: individual: Coma cluster; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters; cosmology: observations; galaxies: clusters: general; cosmic background radiation;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 14263
    Identification Number: 10.1051/0004-6361/201220247
    Depositing User: Dr. Anthony Murphy
    Date Deposited: 26 Mar 2021 12:45
    Journal or Publication Title: Astronomy & Astrophysics
    Publisher: EDP Sciences
    Refereed: Yes
    Related URLs:
    URI: https://mural.maynoothuniversity.ie/id/eprint/14263
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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