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This article has an erratum: [https://doi.org/10.1051/0004-6361/201833896e]


Table 4.

Modelled values (see text) of the different parameters used for the SED modelling with CIGALE.

Parametersa Range of modelled values Best-fit valuesb
Age of the main population; t1 12 Gyr 12 Gyr
Age of the last episode of star formation; t2 10–000 Myr 11 ± 20 Myr
Timescale of the main population; τ1 2–10 Gyr 2.20 ± 0.06 Gyr
Timescale of the last episode of star formation; τ2 10–1000 Myr 310 ± 340 Myr
Burst fraction; log f −4 to −1 −3.7 ± −3.8
IMF Chabrier Chabrier
Metallicity; Z 0.02, 0.05 0.02
Ionisation parameter; log U −3 −3
Reddening of populations younger than 10 Myr; E(B − V)young 0.05–0.70 mag 0.18 ± 0.03
Relative reddening of populations older than 10 Myr; E(B − V)old factor 0.25–0.75 0.05 ± 0.01
UV bump amplitude 0.0, 1.5, 3.0 0
Incident dust radiation field intensity power-law distribution; α 1.0–4.0 3.0

Notes.

(a)

See text (Sect. 3.2) for a detailed explanation of the parameters.

(b)

Best-fit values derived from the total fluxes from Table 3. The results for the individual regions are similar.

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