A depolarizing H I tidal tail in the western lobe of Fornax A

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Table 1.

Summary of the results.

Faraday screen from the Fornax cluster intracluster medium

Region	n_e (r)	n_e power-law	B (r)	B power-law	L	B₀	Plausible
		power spectrum		power spectrum	[kpc]	[μG]
Control region	β-model	No	η-model	n = 2	1000	900	No
	(Chen et al. 2007)		with η = 0.5
H I tail region	β-model	No	η-model	n = 1.6	1000	2000	No
	(Chen et al. 2007)		with η = 0.5

Faraday screen from the Fornax A intra-group

Region	n_e (r)	n_e power-law	B (r)	B power-law	L	B₀	Plausible
		power spectrum		power spectrum	[kpc]	[μG]
Control region	β-model	No	η-model	n = 2	1000	18.5	Yes
	(Babyk et al. 2018)		with η = 0.5
H I tail region	β-model	No	η-model	n = 1.6	1000	50	No
	(Babyk et al. 2018)		with η = 0.5

Faraday screen assuming the advection scenario

Region	n_e (r)	n_e power-law	B (r)	B power-law	L	B₀ ⋅ n₀	Plausible
		power spectrum		power spectrum	[kpc]	[μG cm⁻³]

Control region	Constant	No	Constant	n = 2	11.04	3.5 × 10⁻³	Yes
H I tail region	Constant	No	Constant	n = 1.6	11.04	9.0 × 10⁻³	Yes
H I tail excess	Constant	No	Constant	n = 1.6	11.04	8.5 × 10⁻³	Yes
H I tail excess	Constant	n = 1.6	Constant	n = 1.6	11.04	16.5 × 10⁻³	Yes
		Λ_min = 46 kpc
		Λ_min = 200 kpc

Pressure equilibrium

Region	Gas density	Temperature		Nonthermal pressure		B₀	Plausible
	[cm⁻³]	[K]		[erg cm⁻³]		[μG]

H I tail	10⁻²	10² − 10⁴		4.9 × 10⁻¹¹		9.5−11	Yes

Notes. We specify the scales of fluctuation of the density power spectra since they are different with respect to those of the magnetic field (see text for further details).

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