Table 1
List of extended sources selected based on their extreme spectral index properties (see Sect. 4 for details).
| Source name | z | Average  |
Log P150 MHz | Refs. | |
|---|---|---|---|---|---|
| Central | Lobes | (W Hz−1) | |||
| Remnant radio sources(a) | |||||
| J104618+581421 | 0.168 | 1.3 | 1.1–1.5 | 24.30 | 2 |
| J105034+564539 | 0.703 | – | 1.1 (N); 1.4 (S) | 25.22 | |
| J105123+582801 | 1.66 (*) | – | 1.2–1.5 | 26.50 | |
| J105233+585451 | 0.468-0.505 | – | 1.5 to > 1.9 | 25.17–25.22 | |
| J105554+563537 | – | – | 1.8 | 26.11 | 3 |
| J105723+565938 | 1.142 | 1.1 | 1.6 (N); 1.3 (S) | 25.74 | 2 |
| J110201+583122 | 0.361-0.494 | – | >1.1 (N); >1.28 (S) | 25.50–25.74 | |
| J110255+585740 | 0.339 | – | 1.2 (S); 1.6 to >1.6 (N) | 25.35 | 3 |
| Restarted radio sources(b) | |||||
| J104806+573035 | 0.317 | 0.85 | >1.15(N); >1.3(S) | 24.85 | 1, 2 |
| J104842+585326 | 2.1685 (*) | – | >1.1 | 25.53 | 2 |
| J104913+575008 | 0.073 | 0.90 | >1.4 | 24.14 | 1, 2 |
| J104959+570715 | 0.440 | 0.57 | >1.1 | 24.59 | |
| J105221+585054 | 0.978 | 0.64 | 1.0 to >1.2 (N); >1.2 (S) | 25.84 | |
| J110135+580653 | 0.1597 | 0.80 | >1.25 (N); >1.0 (S) | 24.16 | |
| J110317+573757 | 0.70 | 0.80 | 1.1 (W); >1.0 (E) | 25.84 | |
Notes. The spectral index properties are shown in Figs. 6 and 7. Column 3 lists the spectral index at the location of the peak intensity oroptical position. Column 4 lists the average spectral index in the extended regions. These are derived by averaging over a box in the lobes, avoiding the region at the edges (see Sect. 3). (a) extended sources with
> 1 over the entire emission, see Sect. 4.1 for details;
(b) extended sources with partly USS emission, see Sect. 4.2 for details.
(*) redshifts from the expanded catalogue from Duncan et al. (in prep.), see Sect. 4.
References. (1) Mahony et al. (2016); (2) Jurlin et al. (2020); (3) Brienza et al. (2017).
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