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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The Parkes Galactic Meridian Survey: observations and CMB polarization foreground analysis
Monthly Notices of the Royal Astronomical Society, Volume 405, No. 3, Year 2010
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Description
We present observations and cosmic microwave background (CMB) foreground analysis of the Parkes Galactic Meridian Survey, an investigation of the Galactic latitude behaviour of the polarized synchrotron emission at 2.3 GHz with the Parkes Radio Telescope. The survey consists of a 5° wide strip along the Galactic meridian l = 254° extending from the Galactic plane to the South Galactic pole. We identify three zones distinguished by polarized emission properties: the disc, the halo and a transition region connecting them. The halo section lies at latitudes |b| > 40° and has weak and smooth polarized emission mostly at large scale with steep angular power spectra of median slope βmed ∼ -2.6. The disc region covers the latitudes |b| < 20° and has a brighter, more complex emission dominated by the small scales with flatter spectra of median slope βmed = -1.8. The transition region has steep spectra as in the halo, but the emission increases towards the Galactic plane from halo to disc levels. The change of slope and emission structure at b ∼ -20° is sudden, indicating a sharp disc-halo transition. The whole halo section is just one environment extended over 50° with very low emission which, once scaled to 70 GHz, is equivalent to the CMB B-mode emission for a tensor-to-scalar perturbation power ratio rhalo = (3.3 ± 0.4) × 10-3. Applying a conservative cleaning procedure, we estimate an r detection limit of δr ∼ 2 × 10-3 at 70 GHz (3σ confidence limit) and, assuming a dust polarization fraction of <12 per cent, δr ∼ 1 × 10-2 at 150 GHz. The 150-GHz limit matches the goals of planned sub-orbital experiments, which can therefore be conducted at this high frequency. The 70-GHz limit is close to the goal of proposed next-generation space missions, which thus might not strictly require space-based platforms. © 2010 The Authors. Journal compilation © 2010 RAS.
Authors & Co-Authors
Carretti, Ettore
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Italy, Bologna
Istituto Di Radioastronomia, Bologna
Haverkorn, Marijke
United States, Berkeley
University of California, Berkeley
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
McConnell, David M.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Bernardi, Gianni
Netherlands, Groningen
Rijksuniversiteit Groningen
McClure-Griffiths, Naomi M.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Cortiglioni, Stefano
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Poppi, Sergio
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Statistics
Citations: 18
Authors: 7
Affiliations: 7
Identifiers
Doi:
10.1111/j.1365-2966.2010.16608.x
ISSN:
00358711
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative