Issue |
A&A
Volume 387, Number 1, May III 2002
|
|
---|---|---|
Page(s) | 82 - 97 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20020285 | |
Published online | 15 May 2002 |
Towards a model of full-sky Galactic synchrotron intensity and linear polarisation: A re-analysis of the Parkes data
1
Research and Science Support Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
2
Max-Planck Institut für Astrophysik, Garching bei München, 85741, Germany
3
ESO, Garching bei München, 85748, Germany
4
Warsaw University Observatory, Warsaw, Poland
5
Department of Physics & Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
Corresponding author: G. Giardino, ggiardin@rssd.esa.int
Received:
21
December
2001
Accepted:
22
February
2002
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
the angular power spectrum of the polarised intensity is well
described by a power-law spectrum with fitted spectral index
. 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
and
. 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 (
GHz). This can be used to study the
feasibility of measuring the Cosmic Microwave Background polarisation
with forthcoming experiments and satellite missions.
Key words: radio continuum: ISM / surveys / polarization / cosmic microwave background
© ESO, 2002
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