Planck intermediate results. XII: Diffuse Galactic components in the Gould Belt System
Abstract
We perform an analysis of the diffuse low-frequency Galactic components in the Southern part of the Gould Belt system (130^\circ\leq l\leq 230^\circ and -50^\circ\leq b\leq -10^\circ). Strong ultra-violet (UV) 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 separate 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 compare with the results of cross-correlation of foreground templates with the frequency maps. We estimate the electron temperature T_e from H and free-free emission using two methods (temperature-temperature plot and cross-correlation) and we obtain 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 estimate the frequency spectrum of the diffuse AME and we recover a peak frequency (in flux density units) of 25.5 \pm 1.5 GHz. We verify the reliability of this result with realistic simulations that include the presence of 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 get a good description of the frequency spectrum of the AME for plausible values of the local density and radiation field.
Cite
@article{arxiv.1301.5839,
title = {Planck intermediate results. XII: Diffuse Galactic components in the Gould Belt System},
author = {Planck Collaboration and P. A. R. Ade and N. Aghanim and M. I. R. Alves and M. Arnaud and M. Ashdown and F. Atrio-Barandela and J. Aumont and C. Baccigalupi and A. Balbi and A. J. Banday and R. B. Barreiro and J. G. Bartlett and E. Battaner and L. Bedini and K. Benabed and A. Benoît and J. -P. Bernard and M. Bersanelli and A. Bonaldi and J. R. Bond and J. Borrill and F. R. Bouchet and F. Boulanger and C. Burigana and R. C. Butler and P. Cabella and J. -F. Cardoso and X. Chen and L. -Y Chiang and P. R. Christensen and D. L. Clements and S. Colombi and L. P. L. Colombo and A. Coulais and F. Cuttaia and R. D. Davies and R. J. Davis and P. de Bernardis and G. de Gasperis and G. de Zotti and J. Delabrouille and C. Dickinson and J. M. Diego and G. Dobler and H. Dole and S. Donzelli and O. Doré and M. Douspis and X. Dupac and T. A. Enßlin and F. Finelli and O. Forni and M. Frailis and E. Franceschi and S. Galeotta and K. Ganga and R. T. Génova-Santos and T. Ghosh and M. Giard and G. Giardino and Y. Giraud-Héraud and J. González-Nuevo and K. M. Górski and A. Gregorio and A. Gruppuso and F. K. Hansen and D. Harrison and C. Hernández-Monteagudo and S. R. Hildebrandt and E. Hivon and M. Hobson and W. A. Holmes and A. Hornstrup and W. Hovest and K. M. Huffenberger and T. R. Jaffe and A. H. Jaffe and M. Juvela and E. Keihänen and R. Keskitalo and T. S. Kisner and J. Knoche and M. Kunz and H. Kurki-Suonio and G. Lagache and A. Lähteenmäki and J. -M. Lamarre and A. Lasenby and C. R. Lawrence and S. Leach and R. Leonardi and P. B. Lilje and M. Linden-Vørnle and P. M. Lubin and J. F. Macías-Pérez and B. Maffei and D. Maino and N. Mandolesi and M. Maris and D. J. Marshall and P. G. Martin and E. Martínez-González and S. Masi and M. Massardi and S. Matarrese and P. Mazzotta and A. Melchiorri and A. Mennella and S. Mitra and M. -A. Miville-Deschênes and A. Moneti and L. Montier and G. Morgante and D. Mortlock and D. Munshi and J. A. Murphy and P. Naselsky and F. Nati and P. Natoli and H. U. Nørgaard-Nielsen and F. Noviello and D. Novikov and I. Novikov and S. Osborne and C. A. Oxborrow and F. Pajot and R. Paladini and D. Paoletti and M. Peel and L. Perotto and F. Perrotta and F. Piacentini and M. Piat and E. Pierpaoli and D. Pietrobon and S. Plaszczynski and E. Pointecouteau and G. Polenta and L. Popa and T. Poutanen and G. W. Pratt and S. Prunet and J. -L. Puget and J. P. Rachen and W. T. Reach and R. Rebolo and M. Reinecke and C. Renault and S. Ricciardi and I. Ristorcelli and G. Rocha and C. Rosset and J. A. Rubiño-Martín and B. Rusholme and E. Salerno and M. Sandri and G. Savini and D. Scott and L. Spencer and V. Stolyarov and R. Sudiwala and A. -S. Suur-Uski and J. -F. Sygnet and J. A. Tauber and L. Terenzi and C. T. Tibbs and L. Toffolatti and M. Tomasi and M. Tristram and L. Valenziano and B. Van Tent and J. Varis and P. Vielva and F. Villa and N. Vittorio and L. A. Wade and B. D. Wandelt and N. Ysard and D. Yvon and A. Zacchei and A. Zonca},
journal= {arXiv preprint arXiv:1301.5839},
year = {2015}
}
Comments
20 pages, 14 figures, accepted A&A