Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-07-21
Astrophys.J.594:L5-L8,2003
Astronomy and Astrophysics
Astrophysics
Uses emulateapj.sty, onecolfloat.sty, 5 pages 4 fig., accepted for publication in ApJL
Scientific paper
10.1086/378398
We present the first observation of the diffuse polarized synchrotron radiation of a patch ($\sim 3^\circ \times 3^\circ$) in the BOOMERanG field, one of the areas with the lowest CMB foreground emission. The work has been carried out with the Australia Telescope Compact Array at 1.4 GHz with 3.4 arcmin resolution and sensitivity of $\sim 0.18$ mJy beam$^{-1}$. The mean polarized signal has been found to be $P_{rms} = \sqrt{(Q_{rms}^2 + U_{rms}^2)} = 11.6 \pm 0.6$ mK, nearly one order of magnitude below than in the Galactic Plane. Extrapolations to frequencies of interest for cosmological investigations suggest that polarized synchrotron foreground noise should allow the detection of the CMB Polarization $E$--mode already at 32 GHz and make us confident that, at 90 GHz, it is accessible with no relevant foreground contamination. Last but not least, even the $B$--mode detection for $T/S > 0.01$ is not ruled out in such a low emission patch.
Bernardi Gianni
Carretti Ettore
Cortiglioni Stefano
Kesteven Michael J.
Poppi Sergio
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