Issue |
A&A
Volume 371, Number 2, May IV 2001
|
|
---|---|---|
Page(s) | 708 - 717 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20010384 | |
Published online | 15 May 2001 |
The angular power spectrum of radio emission at 2.3 GHz
1
Astrophysics Division -Space Science 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@astro.estec.esa.nl
Received:
24
November
2000
Accepted:
9
March
2001
We have analysed the Rhodes/HartRAO survey at
2326 MHz and derived the global angular power spectrum of Galactic
continuum emission. In order to measure the angular power spectrum of
the diffuse component, point sources were removed from the map by
median filtering. A least-square fit to the angular power spectrum of
the entire survey with a power law spectrum ,
gives
in the l range 2-100. The angular
power spectrum of radio emission appears to steepen at high Galactic
latitudes and for observed regions with
, the fitted
spectral index is
.
We have extrapolated this result to 30 GHz (the lowest
frequency channel of Planck) and estimate that no significant
contribution to the sky temperature fluctuation is likely to come from
synchrotron at degree-angular scales.
Key words: radio continuum: ISM / surveys / cosmic microwave background / techniques: image processing
© ESO, 2001
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