View article

[PDF] from aanda.org

Planck early results. XIX. All-sky temperature and dust optical depth from Planck and IRAS. Constraints on the “dark gas” in our Galaxy

Authors

Peter AR Ade, Nabila Aghanim, Monique Arnaud, Mark Ashdown, J Aumont, Carlo Baccigalupi, A Balbi, AJ Banday, RB Barreiro, JG Bartlett, E Battaner, K Benabed, A Benoît, J-P Bernard, M Bersanelli, R Bhatia, JJ Bock, A Bonaldi, JR Bond, J Borrill, FR Bouchet, F Boulanger, M Bucher, C Burigana, P Cabella, J-F Cardoso, A Catalano, L Cayón, A Challinor, A Chamballu, L-Y Chiang, C Chiang, PR Christensen, DL Clements, S Colombi, F Couchot, A Coulais, BP Crill, F Cuttaia, TM Dame, Luigi Danese, RD Davies, RJ Davis, P De Bernardis, G De Gasperis, A De Rosa, Gianfranco De Zotti, J Delabrouille, J-M Delouis, F-X Désert, C Dickinson, K Dobashi, S Donzelli, O Doré, U Dörl, M Douspis, X Dupac, G Efstathiou, TA Enßlin, HK Eriksen, E Falgarone, F Finelli, O Forni, P Fosalba, M Frailis, E Franceschi, Y Fukui, S Galeotta, K Ganga, M Giard, G Giardino, Y Giraud-Héraud, J González-Nuevo, KM Górski, S Gratton, A Gregorio, IA Grenier, A Gruppuso, FK Hansen, D Harrison, G Helou, S Henrot-Versillé, D Herranz, SR Hildebrandt, E Hivon, M Hobson, WA Holmes, W Hovest, RJ Hoyland, KM Huffenberger, AH Jaffe, William C Jones, M Juvela, A Kawamura, E Keihänen, R Keskitalo, TS Kisner, R Kneissl, L Knox, H Kurki-Suonio, G Lagache, J-M Lamarre, A Lasenby, RJ Laureijs, CR Lawrence, S Leach, R Leonardi, C Leroy, PB Lilje, M Linden-Vørnle, M López-Caniego, PM Lubin, JF Macías-Pérez, CJ MacTavish, B Maffei, D Maino, N Mandolesi, R Mann, M Maris, P Martin, E Martínez-González, S Masi, Sabino Matarrese, F Matthai, P Mazzotta, P McGehee, PR Meinhold, A Melchiorri, L Mendes, A Mennella, M-A Miville-Deschênes, A Moneti, L Montier, G Morgante, D Mortlock, Dipak Munshi, A Murphy, P Naselsky, P Natoli, CB Netterfield, HU Nørgaard-Nielsen, F Noviello, D Novikov, I Novikov, IJ O’Dwyer, T Onishi, S Osborne, F Pajot, R Paladini, D Paradis

Publication date

2011/12/1

Journal

Astronomy & Astrophysics

Volume

536

Pages

A19

Publisher

EDP sciences

Description

An all sky map of the apparent temperature and optical depth of thermal dust emission is constructed using the Planck-HFI (350μm to 2 mm) andIRAS(100μm) data. The optical depth maps are correlated with tracers of the atomic (Hi) and molecular gas traced by CO. The correlation with the column density of observed gas is linear in the lowest column density regions at high Galactic latitudes. At high N_H, the correlation is consistent with that of the lowest N_H, for a given choice of the CO-to-H₂ conversion factor. In the intermediate N_H range, a departure from linearity is observed, with the dust optical depth in excess of the correlation. This excess emission is attributed to thermal emission by dust associated with a dark gas phase, undetected in the available Hi and CO surveys. The 2D spatial distribution of the dark gas in the solar neighbourhood (|b_II| > 10°) is shown to extend around known molecular regions traced …

Total citations

Cited by 2168