Skip to main content

Planck intermediate results IX. Detection of the Galactic haze with Planck

Author(s): Planck Collaboration; Ade, PAR; Aghanim, N; Arnaud, M; Ashdown, M; et al

To refer to this page use:
Abstract: Using precise full-sky observations from Planck, and applying several methods of component separation, we identify and characterise the emission from the Galactic "haze" at microwave wavelengths. The haze is a distinct component of diffuse Galactic emission, roughly centered on the Galactic centre, and extends to vertical bar b vertical bar similar to 35-50 degrees in Galactic latitude and vertical bar l vertical bar similar to 15-20 degrees in longitude. By combining the Planck data with observations from the Wilkinson Microwave Anisotropy Probe, we were able to determine the spectrum of this emission to high accuracy, unhindered by the strong systematic biases present in previous analyses. The derived spectrum is consistent with power-law emission with a spectral index of -2.56 +/- 0.05, thus excluding free-free emission as the source and instead favouring hard-spectrum synchrotron radiation from an electron population with a spectrum (number density per energy) dN/dE proportional to E-2.1. At Galactic latitudes vertical bar b vertical bar < 30 degrees, the microwave haze morphology is consistent with that of the Fermi gamma-ray "haze" or "bubbles", while at b similar to -50 degrees we have identified an edge in the microwave haze that is spatially coincident with the edge in the gamma-ray bubbles. Taken together, this indicates that we have a multi-wavelength view of a distinct component of our Galaxy. Given both the very hard spectrum and the extended nature of the emission, it is highly unlikely that the haze electrons result from supernova shocks in the Galactic disk. Instead, a new astrophysical mechanism for cosmic-ray acceleration in the inner Galaxy is implied.
Publication Date: 18-Jun-2013
Electronic Publication Date: Jun-2013
Citation: Planck Collaboration, Ade, PAR, Aghanim, N, Arnaud, M, Ashdown, M, Atrio-Barandela, F, Aumont, J, Baccigalupi, C, Balbi, A, Banday, AJ, Barreiro, RB, Bartlett, JG, Battaner, E, Benabed, K, Benoit, A, Bernard, JP, Bersanelli, M, Bonaldi, A, Bond, JR, Borrill, J, Bouchet, FR, Burigana, C, Cabella, P, Cardoso, JF, Catalano, A, Cayon, L, Chary, RR, Chiang, LY, Christensen, PR, Clements, DL, Colombo, LPL, Coulais, A, Crill, BP, Cuttaia, F, Danese, L, D'Arcangelo, O, Davis, RJ, de Bernardis, P, de Gasperis, G, de Rosa, A, de Zotti, G, Delabrouille, J, Dickinson, C, Diego, JM, Dobler, G, Dole, H, Donzelli, S, Dore, O, Dorl, U, Douspis, M, Dupac, X, Efstathiou, G, Ensslin, TA, Eriksen, HK, Finelli, F, Forni, O, Frailis, M, Franceschi, E, Galeotta, S, Ganga, K, Giard, M, Giardino, G, Gonzaalez-Nuevo, J, Gorski, KM, Gratton, S, Gregorio, A, Gruppuso, A, Hansen, FK, Harrison, D, Helou, G, Henrot-Versille, S, Hernandez-Monteagudo, C, Hildebrandt, SR, Hivon, E, Hobson, M, Holmes, WA, Hornstrup, A, Hovest, W, Huffenberger, KM, Jaffe, TR, Jagemann, T, Jewell, J, Jones, WC, Juvela, M, Keihacn, E, Knoche, J, Knox, L, Kunz, M, Kurki-Suonio, H, Lagache, G, Lahteenmaki, A, Lamarre, JM, Lasenby, A, Lawrence, CR, Leach, S, Leonardi, R, Lilje, PB, Linden-Vornle, M, Lopez-Caniego, M, Lubin, PM, Macias-Perez, JF, Maffei, B, Maino, D, Mandolesi, N, Maris, M, Marshall, DJ, Martin, PG, Martinez-Gonzalez, E, Masi, S, Massardi, M, Matarrese, S, Matthai, F, Mazzotta, P, Meinhold, PR, Melchiorri, A, Mendes, L, Mennella, A, Mitra, S, Moneti, A, Montier, L, Morgante, G, Munshi, D, Murphy, JA, Naselsky, P, Natoli, P, Norgaard-Nielsen, HU, Noviello, F, Novikov, D, Novikov, I, Osborne, S, Pajot, F, Paladini, R, Paoletti, D, Partridge, B, Pearson, TJ, Perdereau, O, Perrotta, F, Piacentini, F, Piat, M, Pierpaoli, E, Pietrobon, D, Plaszczynski, S, Pointecouteau, E, Polenta, G, Ponthieu, N, Popa, L, Poutanen, T, Pratt, GW, Prunet, S, Puget, JL, Rachen, JP, Rebolo, R, Reinecke, M, Renault, C, Ricciardi, S, Riller, T, Ristorcelli, I, Rocha, G, Rosset, C, Rubino-Martin, JA, Rusholme, B, Sandri, M, Savini, G, Schaefer, BM, Scott, D, Smoot, GF, Spencer, L, Stivoli, F, Sudiwala, R, Suur-Uski, AS, Sygnet, JF, Tauber, JA, Terenzi, L, Toffolatti, L, Tomasi, M, Tristram, M, Turler, M, Umana, G, Valenziano, L, Van Tent, B, Vielva, P, Villa, F, Vittorio, N, Wade, LA, Wandelt, BD, White, M, Yvon, D, Zacchei, A, Zonca, A. (2013). Planck intermediate results IX. Detection of the Galactic haze with Planck. ASTRONOMY & ASTROPHYSICS, 554 (10.1051/0004-6361/201220271
DOI: doi:10.1051/0004-6361/201220271
ISSN: 0004-6361
Related Item:
Type of Material: Journal Article
Journal/Proceeding Title: ASTRONOMY & ASTROPHYSICS
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.