The Impact of Polarized Extragalactic Radio Sources on the Detection of CMB Anisotropies in Polarization

Figure 2

(a) Distribution of the fractional polarization at 4.8, 8.6, and 20 GHz (green dotted, red dashed, and black solid histograms, resp.) for flat-spectrum sources with 𝑆≥500mJy in the almost-complete subsample of the AT20G survey. (b) Distribution of the fractional polarization at 20 GHz (black solid histogram) compared to the distribution (blue dashed histogram) produced by a log-normal distribution (see also Section 5.1) with Π_med=2.01 and ⟨Π²⟩=3.84 (black dotted line; see Table 2) at 20 GHz.

(a)

(b)