Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-25T18:06:24.835Z Has data issue: false hasContentIssue false
  • English
  • Français

A study of the regular structure of the galactic magnetic field using WMAP5 polarization data at 22 GHz

Published online by Cambridge University Press:  01 November 2008

Beatriz Ruiz-Granados ,
J. A. Rubiño-Martín  and
E. Battaner
Beatriz Ruiz-Granados
Affiliation:
Dpto. Física Teórica y del Cosmos. Edif. Mecenas. Campus Fuentenueva, E-18071. Universidad de Granada & Instituto de Física Teórica y Computacional Carlos I, Granada (Spain) email: [email protected], [email protected]
J. A. Rubiño-Martín
Affiliation:
Instituto de Astrofísica de Canarias (IAC), C/Vía Láctea, s/n, E-38200, La Laguna (Spain) email: [email protected]
E. Battaner
Affiliation:
Dpto. Física Teórica y del Cosmos. Edif. Mecenas. Campus Fuentenueva, E-18071. Universidad de Granada & Instituto de Física Teórica y Computacional Carlos I, Granada (Spain) email: [email protected], [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We study the spatial structure of the 3-dimensional large-scale pattern of the Galactic Magnetic Field using the polarization maps obtained by the WMAP satellite at 22 GHz. By using five different models of the large-scale magnetic field of the Milky Way and a model for the cosmic rays distribution, we predict the expected polarized synchrotron emission. Those maps are compared to the observed 22 GHz polarization data using a Maximum Likelihood method. For each model, we obtain the parameter values which better reproduce the data and obtain their marginal probability distribution functions. We find that the model that best reproduces the observed polarization maps is an “axisymmetric” model.

Keywords

Magnetic fields – galaxies: structure – polarization
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S259: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies , November 2008 , pp. 573 - 576
Copyright
Copyright © International Astronomical Union 2009

References

Drimmel, R. & Spergel, D. N. 2001, ApJ, 556, 181CrossRefGoogle Scholar
Han, J. L. & Qiao, G. J. 1994 A&A 288, 759Google Scholar
Han, J.-L. 1997 Chinese Astronomy and Astrophysics 21, 130Google Scholar
Men, H., Ferriere, K., & Han, J. L. 2008 A&A 486, 819Google Scholar
Noutsos, A., Johnston, S., Kramer, M., & Karastergiou, A. 2008 MNRAS 386, 1881CrossRefGoogle Scholar
Page, L., et al. 2007 ApJ. Suppl. 170, 335CrossRefGoogle Scholar
Rand, R. J. & Kulkarni, S. R. 1989 ApJ. 343, 760CrossRefGoogle Scholar
Sun, X. H., Reich, W., Waelkens, A., & Enßlin, T. A. 2008 A&A 477, 573Google Scholar
Wielebinski, R. and Shakeshaft, J. R. 1962 Nature 195, 982CrossRefGoogle Scholar