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    Planck intermediate results. XII: Diffuse Galactic components in the Gould Belt system


    Ade, P.A.R., Aghanim, N., Alves, M.I.R., Arnaud, M., Ashdown, M., Atrio-Barandela, F., Aumont, J., Baccigalupi, C., Balbi, A., Banday, A.J., Barreiro, R.B., Bartlett, J.G., Battaner, E., Bedini, L., Benabed, K., Benoit, A., Bernard, J.-P., Bersanelli, M., Bonaldi, A., Bond, J.R., Borrill, J., Bouchet, F.R., Boulanger, F., Burigana, C., Butler, R.C., Cabella, P., Cardoso, J.-F., Chen, X., Chiang, L.-Y., Christensen, P.R., Clements, D.L., Colombi, S., Colombo, L.P.L., Coulais, A., Cuttaia, F., Davies, R.D., Davis, R.J., De Bernardis, P., de Gasperis, G., de Zotti, G., Delabrouille, J., Dickinson, C., Diego, J.M., Dobler, G., Dole, H., Donzelli, S., Dore, O., Douspis, M., Dupac, X., Enßlin, T.A., Finelli, F., Forni, O., Frailis, M., Franceschi, E., Galeotta, S., Ganga, K., Genova-Santos, R.T., Ghosh, T., Giard, M., Giardino, G., Giraud-Héraud, Y., Gonzalez-Nuevo, J., Gorski, K.M., Gregorio, A., Gruppuso, A., Hansen, F.K., Harrison, D., Hernandez-Monteagudo, C., Hildebrandt, S.R., Hivon, E., Hobson, M., Holmes, W.A., Hornstrup, A., Hovest, W., Huffenberger, K.M., Jaffe, A.H., Jaffe, T.R., Juvela, M., Keihanen, E., Keskitalo, R., Kisner, T.S., Knoche, J., Kunz, M., Kurki-Suonio, H., Lagache, G., Lahteenmaki, A., Lamarre, J.-M., Lasenby, A., Lawrence, C.R., Leach, S., Leonardi, R., Lilje, P.B., Linden-Vornle, M., Lubin, P.M., Macias-Perez, J.F., Maffei, B., Maino, D., Mandolesi, N., Maris, M., Marshall, D.J., Martin, P.G., Martinez-Gonzalez, E., Masi, S., Massardi, M., Matarrese, S., Mazzotta, P., Melchiorri, A., Mennella, A., Mitra, S., Miville-Deschenes, M.-A., Moneti, A., Montier, L., Morgante, G., Mortlock, D., Munshi, D., Murphy, J.Anthony, Naselsky, P., Nati, F., Natoli, P., Norgaard-Nielsen, H.U., Noviello, F., Novikov, D., Novikov, I., Osborne, S., Oxborrow, C.A., Pajot, F., Paladini, R., Paoletti, D., Peel, M., Perotto, L., Perrotta, F., Piacentini, F., Piat, M., Pierpaoli, E., Pietrobon, D., Plaszczynski, S., Pointecouteau, E., Polenta, G., Popa, L., Poutanen, T., Pratt, G.W., Prunet, S., Puget, J.-L., Rachen, J.P., Reach, W.T., Rebolo, R., Reinecke, M., Renault, C., Ricciardi, S., Ristorcelli, I., Rocha, G., Rosset, C., Rubino-Martin, J.A., Rusholme, B., Salerno, E., Sandri, M., Savini, G., Scott, D., Spencer, L., Stolyarov, V., Sudiwala, R., Suur-Uski, A.-S., Sygnet, J.-F., Tauber, J.A., Terenzi, L., Tibbs, C.T., Toffolatti, L., Tomasi, M., Tristram, M., Valenziano, L., Van Tent, B., Varis, J., Vielva, P., Villa, F., Vittorio, N., Wade, L.A., Wandelt, B.D., Ysard, N., Yvon, D., Zacchei, A. and Zonca, A. (2013) Planck intermediate results. XII: Diffuse Galactic components in the Gould Belt system. Astronomy & Astrophysics, 557 (A53). ISSN 0004-6361

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    Abstract

    We perform an analysis of the diffuse low-frequency Galactic components in the southern part of the Gould Belt system (130° ≤ l ≤ 230° and −50° ≤ b ≤ −10°). Strong ultra-violet flux coming from the Gould Belt super-association is responsible for bright diffuse foregrounds that we observe from our position inside the system and that can help us improve our knowledge of the Galactic emission. Free-free emission and anomalous microwave emission (AME) are the dominant components at low frequencies (ν < 40 GHz), while synchrotron emission is very smooth and faint. We separated diffuse free-free emission and AME from synchrotron emission and thermal dust emission by using Planck data, complemented by ancillary data, using the correlated component analysis (CCA) component-separation method and we compared our results with the results of cross-correlation of foreground templates with the frequency maps. We estimated the electron temperature Te from Hα and free-free emission using two methods (temperature-temperature plot and cross-correlation) and obtained Te ranging from 3100 to 5200K for an effective fraction of absorbing dust along the line of sight of 30% (fd = 0.3). We estimated the frequency spectrum of the diffuse AME and recovered a peak frequency (in flux density units) of 25.5 ± 1.5 GHz. We verified the reliability of this result with realistic simulations that include biases in the spectral model for the AME and in the free-free template. By combining physical models for vibrational and rotational dust emission and adding the constraints from the thermal dust spectrum from Planck and IRAS, we are able to present a good description of the AME frequency spectrum for plausible values of the local density and radiation field.
    Item Type: Article
    Additional Information: Appendices are available in electronic form at http://www.aanda.org
    Keywords: Planck Collaboration; Galaxy: general; radio continuum: ISM; radiation mechanisms: general;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 14206
    Identification Number: 10.1051/0004-6361/201321160
    Depositing User: Dr. Anthony Murphy
    Date Deposited: 18 Mar 2021 17:12
    Journal or Publication Title: Astronomy & Astrophysics
    Publisher: EDP Sciences
    Refereed: Yes
    Related URLs:
    URI: https://mural.maynoothuniversity.ie/id/eprint/14206
    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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