2010MNRAS.405.1670C


Query : 2010MNRAS.405.1670C

2010MNRAS.405.1670C - Mon. Not. R. Astron. Soc., 405, 1670-1689 (2010/July-1)

The Parkes Galactic Meridian Survey: observations and CMB polarization foreground analysis.

CARRETTI E., HAVERKORN M., McCONNELL D., BERNARDI G., McCLURE-GRIFFITHS N.M., CORTIGLIONI S. and POPPI S.

Abstract (from CDS):

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 2.3GHz 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 70GHz, is equivalent to the CMB B-mode emission for a tensor-to-scalar perturbation power ratio rhalo= (3.3±0.4)x10–3. Applying a conservative cleaning procedure, we estimate an r detection limit of δr ∼ 2x10–3 at 70GHz (3σ confidence limit) and, assuming a dust polarization fraction of <12per cent, δr ∼ 1x10–2 at 150GHz. 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.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): polarization - Galaxy: disc - Galaxy: halo - Galaxy: structure - cosmic background radiation

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 567 0
2 NGC 612 Sy2 01 33 57.751 -36 29 35.80   13.90 13.15 12.33   ~ 232 0
3 NAME Pic A Sy1 05 19 49.7229323856 -45 46 43.852662732   15.73 15.77 14.85   ~ 665 1
4 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 851 1
5 QSO J0635-7516 Bla 06 35 46.5079301472 -75 16 16.816418256   15.96 15.75 15.82   ~ 588 1
6 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1178 0
7 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1225 1
8 NAME SCP reg ~ ~           ~ 100 0

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