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

Table 4

Median and dispersion of the log-normal distribution for the fractional polarization, Π, as a function of frequency and for the different radio source populations relevant at CMB frequencies. Two cases are considered, a more “optimistic” one and a more “conservative” one (see Section 5.1).

	𝜈≲40GHz			𝜈>40GHz
	Steep	FSRQ	BL Lac	Steep	FSRQ	BL Lac
	Lower case (more “optimistic”)
Πmed (%)	3.0	2.0	2.5	4.0	2.5	3.0
⟨Π^2⟩^1/2 (%)	5.0	3.0	3.5	6.0	3.5	4.2
	Upper case (more “conservative”)
Πmed (%)	4.0	3.0	3.6	5.0	3.6	4.3
⟨Π^2⟩^1/2 (%)	6.0	3.8	4.5	7.0	4.6	5.5