Multifrequency study of three giant radio galaxies with recurrent jet-formation activity: J1021+1216, J1528+0544, and J2345–0449 - II. Spectral aging analysis and dynamical modeling

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Table 3.

Summary of all the active and quiescent phase durations derived in Sect. 4.3.

Phase	Duration [Myr]
	J1021+1216	J1528+0544	J2345–0449
1st active	43 ± 4	18 ± 8	42 ± 4
1st quiescent	< 5^a	–^a	$16_{- 16}^{+ 5}$ $16^{+5}_{-16}$
2nd active	2^a	< 23^a	$1_{- 0}^{+ 18}$ $1^{+18}_{-0}$
2nd quiescent	$16_{- 8}^{+ 0}$ $16^{+0}_{-8}$	< 6	–
3rd active	$0 . 2_{- 0}^{+ 8}$ $0.2^{+8}_{-0}$	< 12	–

Notes.

^(a)

These results are uncertain.

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