A view of the CIZA J2242.8+5301 galaxy cluster at very low radio frequencies

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Table 4.

Mach number estimates for the northern (RN) and southern (RS) radio relics in CIZA J2242.8+5301.

	Source

	RN	RS	Ref.
$M_{R}^{⋆}$ $\mathcal{M}_{\mathrm{R}}^{\star}$	$4 . 6_{- 0.9}^{+ 1.3}$ $4.6^{+1.3}_{-0.9}$	−	van Weeren et al. (2011b)
$M_{R}^{⋆}$ $\mathcal{M}_{\mathrm{R}}^{\star}$	4.58 ± 1.09	2.81 ± 0.19	Stroe et al. (2013)
$M_{R}^{⋆}$ $\mathcal{M}_{\mathrm{R}}^{\star}$	$4 . 4_{- 0.6}^{+ 1.1}$ $4.4^{+1.1}_{-0.6}$	2.4 ± 0.1	Hoang et al. (2017)
$M_{R}^{⋆}$ $\mathcal{M}_{\mathrm{R}}^{\star}$	$4 . 2_{- 0.6}^{+ 0.4}$ $4.2^{+0.4}_{-0.6}$	−	Loi et al. (2020)
$M_{R}^{⋆}$ $\mathcal{M}_{\mathrm{R}}^{\star}$	4.8 ± 0.8	2.6 ± 0.1	This work
$M_{R}^{\|}$ $\mathcal{M}_{\mathrm{R}}^{\|}$	$2 . 90_{- 0.13}^{+ 0.10}$ $2.90^{+0.10}_{-0.13}$	−	Stroe et al. (2014a)
$M_{R}^{∙}$ $\mathcal{M}_{\mathrm{R}}^{\bullet}$	$2 . 9_{- 0.2}^{+ 0.3}$ $2.9^{+0.3}_{-0.2}$	$2 . 2_{- 0.4}^{+ 2.1}$ $2.2^{+2.1}_{-0.4}$	Raja et al. (2024)
$M_{R}^{∙}$ $\mathcal{M}_{\mathrm{R}}^{\bullet}$	2.58 ± 0.17	2.10 ± 0.08	Di Gennaro et al. (2018)
$M_{R}^{∙}$ $\mathcal{M}_{\mathrm{R}}^{\bullet}$	$2 . 7_{- 0.3}^{+ 0.6}$ $2.7^{+0.6}_{-0.3}$	$1 . 9_{- 0.2}^{+ 0.3}$ $1.9^{+0.3}_{-0.2}$	Hoang et al. (2017)
$M_{R}^{∙}$ $\mathcal{M}_{\mathrm{R}}^{\bullet}$	2.9 ± 0.4	2.9 ± 0.8	This work
ℳ_X	$2 . 7_{- 0.4}^{+ 0.7}$ $2.7^{+0.7}_{-0.4}$	$1 . 7_{- 0.3}^{+ 0.4}$ $1.7^{+0.4}_{-0.3}$	Akamatsu et al. (2015)
ℳ_X	$2 . 54_{- 0.43}^{+ 0.64}$ $2.54^{+0.64}_{-0.43}$	–	Ogrean et al. (2014)
ℳ_X	3.15 ± 0.52	–	Akamatsu & Kawahara (2013)
ℳ_X	–	1.2 − 1.3	Ogrean et al. (2013)

Notes. ^⋆: derived from volume-integrated spectral index via Eq. (4); ^|: derived from spectral ageing modelling; ^•: derived from local spectral index measurement at the relic edge from images or maps.

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