Spatially resolved spectrophotometric SED modeling of NGC 253’s central molecular zone - I. Star formation in extragalactic giant molecular clouds

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Table A.1.

List of input parameters for CIGALE modeling.

*Parameters*		*Values*

Delayed star formation history + additional burst (Ciesla et al. 2015)
e-folding time of the main stellar population model [Myr]	τ_main	300-5000 by a bin of 300
e-folding time of the late starburst population model [Myr]	τ_burst	50-500 by a bin of 50
Mass fraction of the late burst population	f_burst	0.01, 0.03, 0.05, 0.1, 0.3, 0.6, 0.9
Age of the main stellar population in the galaxy [Myr]	age	1000, 2000, 3000, 4500, 5000, 6500, 10000, 12000
Age of the late burst [Myr]	age_burst	10-350 by a bin of 50

Stellar synthesis population (Bruzual & Charlot 2003)

Initial mass function	IMF	(Salpeter 1955)
Metallicity	Z	0.02
Separation age		1 Myr

Dust attenuation laws (Calzetti et al. 2000)

Color excess of young stars	E(B-V)	0.1-2 by a bin of 0.2
Reduction factor⁽ⁱⁱⁱ⁾	f_att	0.3, 0.44, 0.6, 0.7

Dust emission (Draine et al. 2014)

Mass fraction of PAH	q_PAH	0.47, 1.77, 2.50, 3.19, 4.58, 5.26, 6.63, 7.32
Minimum radiation field	U_min	0.4, 0.8, 1.2, 1.6, 2.0, 2.5, 4, 8, 15
Power law index of the radiation	α	2
Fraction illuminated from U_min to U_max	γ	0.02, 0.06, 0.1, 0.15, 0.2

Active nucleus model: Skirtor (Stalevski et al. 2012, 2016)

Optical depth at 9.7 μm	τ_9.7	3.0, 7.0
Torus density radial parameter	pl	1.0
Torus density angular parameter	q	1.0
Angle between the equatorial plan and edge of the torus [deg]	oa	40
Ratio of outer to inner radius	R	20
Fraction of total dust mass inside clumps [%]	Mcl	97
Inclination (viewing angle) [deg]	i	30 (type 1), 70 (type 2)
AGN fraction		0.0-0.4 by a bin of 0.05
Extinction law of polar dust		SMC
E(B-V) of polar dust		0.01-0.7 by a bin of 0.5
Temperature of the polar dust	K	100
Emissivity index of the polar dust		1.6

Radio

SF FIR/radio parameter^*	q_IR	1.3 - 2.9 by a bin of 0.5
SF Power-law slope (flux, ∝, and frequency, ^α_synch)	α_SF	−2.0 to −0.2 by a bin of 0.5
Radio-loudness parameter^**	R_AGN	0.01, 0.05, 0.1, 0.5... 1000, 5000
AGN Power-law slope	α_AGN	−2.0 to −0.2 by a bin of 0.5

Notes.^* computed as log₁₀L_{IR(8−1000μm)} - ${log}_{10} L_{1.4 GHz}$ $\log_{10}L_{1.4\,\rm{GHz}}$ , where L_1.4 GHz is the radio luminosity at 1.4 GHz.

^** defined as a ratio of AGN luminosities measured at 5 GHz and 2500Å.

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