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Table 3.

Radio halos detected over a large frequency range.

Name Frequency Spectral index (a) Curvature σ2D(b) Mass Reference
[MHz] [1014M]
Abell 2256 23–1500 α 23 1500 = 1.56 ± 0.02 $ \alpha_{23}^{1500} = -1.56 \pm 0.02 $ No ≈0.2 6.2 ± 0.1 This work
Bullet cluster 1100–3100 α 1100 3100 = 1.1 ± 0.2 $ \alpha_{1100}^{3100} = -1.1 \pm 0.2 $ No 13.1 ± 0.29 Shimwell et al. (2014), Sikhosana et al. (2023)
Toothbrush cluster 147–4900 α 147 4900 = 1.15 ± 0.06 $ \alpha_{147}^{4900} = -1.15 \pm 0.06 $ No < 0.04 10.8 ± 0.45 van Weeren et al. (2012b)
Abell 2744 325–1500 α 325 1500 = 1.32 ± 0.14 $ \alpha_{325}^{1500} = -1.32 \pm 0.14 $ No 9.8 ± 0.4 Pearce et al. (2017)
Abell S1063 325–3000 α 325 1500 = 0.94 ± 0.08 $ \alpha_{325}^{1500} = -0.94 \pm 0.08 $ Yes 11.4 ± 0.34 Xie et al. (2020)
Coma cluster 30–5000 α 144 342 = 1.0 ± 0.2 $ \alpha_{144}^{342} = -1.0 \pm 0.2 $ Yes 7.2 ± 0.1 Bonafede et al. (2022)
MACS J0717.5+3745 144–1500 α 144 1500 = 1.39 ± 0.04 $ \alpha_{144}^{1500} = -1.39 \pm 0.04 $ Yes ≈0.3 11.5 ± 0.5 Rajpurohit et al. (2021a)

Notes.

(a)

In case the spectrum is curved, only the spectral index measured below the break frequency, is given.

(b)

Observed spatial scatter in the spectral index.

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