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Table 1.

Models and their parameter space used by X-CIGALE for the SED fitting of the colour-selected high-z sources.

Parameter Value
Star formation history: double-exponentially decreasing (2τ-dec) model
Age of the main stellar population in Myr 500, 1000, 3000, 5000, 7000, 9000
e-folding time of the main stellar population model in Myr, τmain 100, 500, 1000, 3000, 5000, 9000
Age of the late burst in Gyr, ageburst 10, 50, 100, 200, 400
fburst 0.0, 0.1, 0.3, 0.5
τburst 3000, 9000

Stellar population synthesis model
Single Stellar Population Library Bruzual & Charlot (2003)
Initial Mass Function Salpeter (1955)
Metallicity 0.02 (Solar)

Nebular emission
Ionization parameter (log U) −2.0
Fraction of Lyman continuum escaping the galaxy (fesc) 0.0
Fraction of Lyman continuum absorbed by dust (fdust) 0.0
Line width in km s−1 300.0

Dust attenuation: Calzetti et al. (2000)
Colour excess of stellar continuum light for young stars E(B − V) 0.05, 0.3, 0.5, 0.7, 0.9
Reduction factor for the E(B − V) of the old stars compared to the young ones 0.44

Dust template: Draine et al. (2014)
Mass fraction of PAH (qpah) 0.47, 4.58, 7.32
Minimum radiation field (Umin) 5, 50
Powerlaw slope dU/dM propto Uα 2.0
Fraction illuminated from Umin to Umax, γ 0.1

AGN models from Stalevski et al. (2016) (SKIRTOR)
Average edge-on optical depth at 9.7 micron (t) 7.0
Power-law exponent that sets radial gradient of dust density (pl) 1.0
Index that sets dust density gradient with polar angle (q) 1.0
Angle measured between the equatorial plan and edge of the torus (oa) 40
Ratio of outer to inner radius, Rout/Rin 20
Fraction of total dust mass inside clumps (Mcl) 97%
Inclination angle (i) 30, 70
AGN fraction 0.01, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.99
Extinction in polar direction, E(B − V) 0.0, 0.8
Emissivity of the polar dust 1.6
Temperature of the polar dust (K) 100.0
The extinction law of polar dust SMC

Redshift values 0.0–7.0 with a step of 0.05

Notes. Edge-on, type-2 AGN have inclination i = 70 degrees and face-on, type-1 AGN have i = 30°. The extinction in polar direction, E(B − V), included in the AGN module, accounts for the possible extinction in type-1 AGN, due to polar dust. The AGN fraction is measured as the AGN emission relative to IR luminosity (1–1000 μm).

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