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

By P. A. R. Ade, N. Aghanim, M. I. R., M. Arnaud, M. Ashdown, F. Atrio-Barandela, J. Aumont, C. Baccigalupi, A. Balbi, A. J. Banday, R. B. Barreiro, J. G. Bartlett, E. Battaner, L. Bedini, K. Benabed, A. Benoit, J. P., M. Bersanelli, A. Bonaldi, J. R. Bond, J. Borrill, F. R. Bouchet, F. Boulanger, C. Burigana, R. C. Butler, P. Cabella, J. F., X. Chen, L. Y., P. R. Christensen, D. L. Clements, S. Colombi, L. P. L., A. Coulais, F. Cuttaia, R. D. Davies, R. J. Davis, P. d. Bernardis, G. d. Gasperis, G. d. Zotti, J. Delabrouille, C. Dickinson, J. M. Diego, G. Dobler, H. Dole, S. Donzelli, O. Dore, M. Douspis, X. Dupac, T. A. Ensslin, F. Finelli, O. Forni, M. Frailis, E. Franceschi, S. Galeotta, K. Ganga, R. T. Genova-Santos, T. Ghosh, M. Giard, G. Giardino, Y. Giraud-Heraud, J. Gonzalez-Nuevo, K. M. Gorski, A. Gregorio, A. Gruppuso, F. K. Hansen, D. Harrison, C. Hernandez-Monteagudo, S. R. Hildebrandt, E. Hivon, M. Hobson, W. A. Holmes, A. Hornstrup, W. Hovest, K. M. Huffenberger, T. R. Jaffe, A. H. Jaffe, M. Juvela, E. Keihanen, R. Keskitalo, T. S. Kisner, J. Knoche, M. Kunz, H. Kurki-Suonio, G. Lagache, A. Lahteenmaki, J. M., A. Lasenby, C. R. Lawrence, S. Leach, R. Leonardi, P. B. Lilje, M. Linden-Vornle, P. M. Lubin, J. F. Macias-Perez, B. Maffei, D. Maino, N. Mandolesi, M. Maris, D. J. Marshall, P. G. Martin, E. Martinez-Gonzalez, S. Masi, M. Massardi, S. Matarrese, P. Mazzotta, A. Melchiorri, A. Mennella, S. Mitra, M. A., A. Moneti, L. Montier, G. Morgante, D. Mortlock, D. Munshi, J. A. Murphy, P. Naselsky, F. Nati, P. Natoli, H. U. Norgaard-Nielsen, F. Noviello, D. Novikov, I. Novikov, S. Osborne, C. A. Oxborrow, F. Pajot, R. Paladini, D. Paoletti, M. Peel, L. Perotto, 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. L., J. P. Rachen, W. T. Reach, R. Rebolo, M. Reinecke, C. Renault, S. Ricciardi, I. Ristorcelli, G. Rocha, C. Rosset, J. A. Rubino-Martin, B. Rusholme, E. Salerno, M. Sandri, G. Savini, D. Scott, L. Spencer, V. Stolyarov, R. Sudiwala, A. S. J. F., J. A. Tauber, L. Terenzi, C. T. Tibbs, L. Toffolatti, M. Tomasi, M. Tristram, L. Valenziano, B. V. Tent, J. Varis, P. Vielva, F. Villa, N. Vittorio, L. A. Wade, B. D. Wandelt, N. Ysard, D. Yvon, A. Zacchei and A. Zonca

Abstract

We perform an analysis of the diffuse low-frequency Galactic components in the southern part of the Gould Belt system (130 degrees <= l <= 230 degrees and -50 degrees <= b <= -10 degrees). 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 (nu < 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 T-e from Ha and free-free emission using two methods (temperature-temperature plot and cross-correlation) and obtained T-e ranging from 3100 to 5200 K for an effective fraction of absorbing dust along the line of sight of 30% (f(d) = 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

Year: 2013
DOI identifier: 10.1051/0004-6361
OAI identifier: oai:iris.unife.it:11392/2284436
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