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Towards a model of full-sky Galactic synchrotron intensity and linear polarisation: a re-analysis of the Parkes data

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arxiv astro-ph/0202520 v1 pith:7U3AIPD6 submitted 2002-02-28 astro-ph

G. Giardino (1) , A.J. Banday (2) , K.M. Gorski (3) , K. Bennett (1) , J.L. Jonas (4) , J.Tauber (1) ((1) RSSD of ESA , Noordwijk , (2) MPA
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Garching (3) ESO Garching (4) Rhodes University Grahamstown)
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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 (> 10 GHz). This can be used to study the feasibility of measuring the Cosmic Microwave Background polarisation with forthcoming experiments and satellite missions.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Intensity fluctuations of radio halo in galaxy cluster: Insights from power spectrum estimation

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    Angular power spectra of 610 MHz radio halos show excess power-law fluctuations only in Abell 2744, requiring multiplicative C_ℓ ∝ ℓ^{-3} structure atop an exponential profile and consistent with ICM turbulence.

  2. Foreground Subtraction with a Tensor-Based Oriented Singular Value Decomposition Method for HI Experiments

    astro-ph.IM 2026-08 conditional novelty 5.0 of 10

    A tensor-oriented singular value decomposition can subtract radio foregrounds from 21 cm intensity mapping data while preserving more cosmological signal than standard PCA.

  3. Investigating radio source population $\&$ spatial characteristics of diffuse Galactic synchrotron emission in the GAMA-23 field with uGMRT Band-3

    astro-ph.GA 2026-08 conditional novelty 4.0 of 10

    A 325 MHz uGMRT mosaic of the GAMA-23 field yields a 5741-source catalog, source counts, spectral indices, and angular power spectra of diffuse Galactic synchrotron emission.

  4. All-sky modeling of Galactic emission at radio and microwave frequencies

    astro-ph.GA 2026-06 unverdicted novelty 4.0 of 10

    The authors produce a new all-sky Galactic emission model with synchrotron amplitude at 4.76 GHz roughly twice the Planck 2015 value, derived via Commander fitting to recent radio and microwave surveys.

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