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          Institute: MPI für Astrophysik     Collection: Cosmology     Display Documents

ID: 10779.0, MPI für Astrophysik / Cosmology
Towards a model of full-sky Galactic synchrotron intensity and linear polarisation: A re-analysis of the Parkes data
Authors:Giardino, G.; Banday, A. J.; Gorski, K. M.; Bennett, K.; Jonas, J. L.; Tauber, J.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:1
Start Page:82
End Page:97
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We have analysed the angular power spectra of the Parkes radio continuum and polarisation survey of the Southern galactic plane at 2.4 GHz. We have found that in the multipole range l = 40-250 the angular power spectrum of the polarised intensity is well described by a power-law spectrum with fitted spectral index alpha(L) = 2.37 +/- 0.21. In the same multipole range the angular power spectra of the E and B components of the polarised signal are significantly flatter, with fitted spectral indices respectively of alpha(E) = 1.57 +/- 0.12 and alpha(B) = 1.45 +/- 0.12. Temperature fluctuations in the E and B components are mostly determined by variations in polarisation angle. We have combined these results with other data from available radio surveys in order to produce a full- sky toy model of Galactic synchrotron intensity and linear polarisation at high frequencies (nu greater than or similar to 10 GHz). This can be used to study the feasibility of measuring the Cosmic Microwave Background polarisation with forthcoming experiments and satellite missions.
Free Keywords:radio continuum : ISM; surveys; polarization; cosmic microwave background
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:European Space Agcy, ESTEC, Res & Sci Support Dept, Postbus; 299, NL-2200 AG Noordwijk, Netherlands; European Space Agcy, ESTEC, Res & Sci Support Dept, NL-2200 AG Noordwijk, Netherlands; Max Planck Inst Astrophys, D-85741 Garching, Germany; ESO, D-85748 Garching, Germany; Univ Warsaw Observ, Warsaw, Poland; Rhodes Univ, Dept Phys & Elect, ZA-6140 Grahamstown, South Africa
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