Planck intermediate results. XXIX. All-sky dust modelling with Planck, IRAS, and WISE observations
Abstract
We present all-sky modelling of the high resolution Planck, IRAS, and WISE infrared (IR) observations using the physical dust model presented by Draine and Li in 2007 (DL). We study the performance and results of this model, and discuss implications for future dust modelling. The present work extends the DL dust modelling carried out on nearby galaxies using Herschel and Spitzer data to Galactic dust emission. We employ the DL dust model to generate maps of the dust mass surface density, the optical extinction Av, and the starlight intensity parametrized by Umin. The DL model reproduces the observed spectral energy distribution (SED) satisfactorily over most of the sky, with small deviations in the inner Galactic disk and in low ecliptic latitude areas. We compare the DL optical extinction Av for the diffuse interstellar medium with optical estimates for 2 10^5 quasi-stellar objects (QSOs) observed in the Sloan digital sky survey. The DL Av estimates are larger than those determined towards QSOs by a factor of about 2, which depends on Umin. The DL fitting parameter Umin, effectively determined by the wavelength where the SED peaks, appears to trace variations in the far-IR opacity of the dust grains per unit Av, and not only in the starlight intensity. To circumvent the model deficiency, we propose an empirical renormalization of the DL Av estimate, dependent of Umin, which compensates for the systematic differences found with QSO observations. This renormalization also brings into agreement the DL Av estimates with those derived for molecular clouds from the near-IR colours of stars in the 2 micron all sky survey. The DL model and the QSOs data are used to compress the spectral information in the Planck and IRAS observations for the diffuse ISM to a family of 20 SEDs normalized per Av, parameterized by Umin, which may be used to test and empirically calibrate dust models.
Keywords
Cite
@article{arxiv.1409.2495,
title = {Planck intermediate results. XXIX. All-sky dust modelling with Planck, IRAS, and WISE observations},
author = {Plank Collaboration and P. A. R. Ade and N. Aghanim and M. I. R. Alves and G. Aniano and M. Arnaud and M. Ashdown and J. Aumont and C. Baccigalupi and A. J. Banday and R. B. Barreiro and N. Bartolo and E. Battaner and K. Benabed and A. Benoit-Levy and J. -P. Bernard and M. Bersanelli and P. Bielewicz and A. Bonaldi and L. Bonavera and J. R. Bond and J. Borrill and F. R. Bouchet and F. Boulanger and C. Burigana and R. C. Butler and E. Calabrese and J. -F. Cardoso and A. Catalano and A. Chamballu and H. C. Chiang and P. R. Christensen and D. L. Clements and S. Colombi and L. P. L. Colombo and F. Couchot and B. P. Crill and A. Curto and F. Cuttaia and L. Danese and R. D. Davies and R. J. Davis and P. de Bernardis and A. de Rosa and G. de Zotti and J. Delabrouille and C. Dickinson and J. M. Diego and H. Dole and S. Donzelli and O. Dore and M. Douspis and B. T. Draine and A. Ducout and X. Dupac and G. Efstathiou and F. Elsner and T. A. Ensslin and H. K. Eriksen and E. Falgarone and F. Finelli and O. Forni and M. Frailis and A. A. Fraisse and E. Franceschi and A. Frejsel and S. Galeotta and S. Galli and K. Ganga and T. Ghosh and M. Giard and E. Gjerlow and J. Gonzalez-Nuevo and K. M. Gorski and A. Gregorio and A. Gruppuso and V. Guillet and F. K. Hansen and D. Hanson and D. L. Harrison and S. Henrot-Versille and C. Hernandez-Monteagudo and D. Herranz and S. R. Hildebrandt and E. Hivon and W. A. Holmes and W. Hovest and K. M. Huffenberger and G. Hurier and A. H. Jaffe and T. R. Jaffe and W. C. Jones and E. Keihanen and R. Keskitalo and T. S. Kisner and R. Kneissl and J. Knoche and M. Kunz and H. Kurki-Suonio and G. Lagache and J. -M. Lamarre and A. Lasenby and M. Lattanzi and C. R. Lawrence and R. Leonardi and F. Levrier and M. Liguori and P. B. Lilje and M. Linden-Vornle and M. Lopez-Caniego and P. M. Lubin and J. F. Macias-Perez and B. Maffei and D. Maino and N. Mandolesi and M. Maris and D. J. Marshall and P. G. Martin and E. Martinez-Gonzalez and S. Masi and S. Matarrese and P. Mazzotta and A. Melchiorri and L. Mendes and A. Mennella and M. Migliaccio and M. -A. Miville-Deschenes and A. Moneti and L. Montier and G. Morgante and D. Mortlock and D. Munshi and J. A. Murphy and P. Naselsky and P. Natoli and H. U. Norgaard-Nielsen and D. Novikov and I. Novikov and C. A. Oxborrow and L. Pagano and F. Pajot and R. Paladini and D. Paoletti and F. Pasian and O. Perdereau and L. Perotto and F. Perrotta and V. Pettorino and F. Piacentini and M. Piat and S. Plaszczynski and E. Pointecouteau and G. Polenta and N. Ponthieu and L. Popa 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 M. Remazeilles and C. Renault and I. Ristorcelli and G. Rocha and G. Roudier and J. A. Rubio-Martin and B. Rusholme and M. Sandri and D. Santos and D. Scott and L. D. Spencer and V. Stolyarov and R. Sudiwala and R. Sunyaev and D. Sutton and A. -S. Suur-Uski and J. -F. Sygnet and J. A. Tauber and L. Terenzi and L. Toffolatti and M. Tomasi and M. Tristram and M. Tucci and G. Umana and L. Valenziano and J. Valiviita and B. Van Tent and P. Vielva and F. Villa and L. A. Wade and B. D. Wandelt and I. K. Wehus and N. Ysard and D. Yvon and A. Zacchei and A. Zonca},
journal= {arXiv preprint arXiv:1409.2495},
year = {2016}
}
Comments
Final version that has appeared in A&A