GalaPy: A highly optimised C++/Python spectral modelling tool for galaxies - I. Library presentation and photometric fitting

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Volume 685 (May 2024)

A&A, 685 (2024) A161

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Table B.3

Complete list of the tunable parameters available in GalaPy.

Keyword	Symbol in text	Description	Section ref.
Global

`age`	τ	Age of the galaxy	2
`redshift`	ɀ	Redshift of the galaxy	2.6.1

Star Formation History

`sfh.model`	—	SFH model: one among the keywords listed below	2.1
`sfh.tau_quench`	τ_quench	Age of the abrupt quenching	2.1

Constant (keyword: `constant`)

`sfh.psi`	ψ₀	Value of the constant SFR	2.1
`sfh.Mdust`	M_dust	Total dust mass in galaxy at the given age	2.1.1
`sfh.Zgxy`	Z_gxy	Metallicity of all phases in galaxy at the given age	2.1.1

Delayed Exponential (keyword: `delayedexp`)

`sfh.psi_norm`	ψ_norm	Normalisation	2.1
`sfh.k_shape`	κ	Shape parameter of the early evolution	2.1
`sfh.tau_star`	τ_★	Characteristic timescale	2.1
`sfh.Mdust`	M_dust	[same as for constant SFH]	2.1.1
`sfh.Zgxy`	Z_gxy	[same as for constant SFH]	2.1.1

Log-Normal (keyword: `lognormal`)

`sfh.psi_norm`	ψ_norm	Normalisation	2.1
`sfh.sigma_star`	σ_★	Characteristic width	2.1
`sfh.tau_star`	τ_★	Peak age	2.1
`sfh.Mdust`	M_dust	[same as for constant SFH]	2.1.1
`sfh.Zgxy`	Z_gxy	[same as for constant SFH]	2.1.1

Interpolated (keyword: `interpolated`)

`sfh.Mdust`	M_dust	[same as for constant SFH]	2.1.1
`sfh.Zgxy`	Z_gxy	[same as for constant SFH]	2.1.1

In situ (keyword: `insitu`)

`sfh.psi_max`	ψ_max	Normalisation	2.1
`sfh.tau_star`	τ_★	Characteristic timescale	2.1

Inter-Stellar Medium

`ism.f_MC`	f_MC	Fraction of dust in the MC phase	2.3

Molecular Clouds

`ism.norm_MC`	$C_{V}^{MC}$ $C_V^{{\rm{MC}}}$	Normalisation of the MC extinction in the visible band	2.3
`ism.N_MC`	N_MC	Number of MCs in the galaxy	2.3
`ism.R_MC`	R_mc	Average radius of a MC	2.3
`ism.tau_esc`	τ_esc	Time required by stars to start escaping their MC	2.3
`ism.dMClow`	$δ_{MC}^{l}$ ${\delta _{{\rm{MC}}}^{\rm{l}}}$	Extinction power-law index at wavelength < 100µm (10⁶Å)	2.3
`ism.dMCupp`	$δ_{MC}^{u}$ ${\delta _{{\rm{MC}}}^{\rm{u}}}$	Extinction power-law index at wavelength > 100µm (10⁶Å)	2.3

Diffuse Dust

`ism.norm_DD`	$C_{V}^{DD}$ $C_V^{{\rm{DD}}}$	Normalisation of the DD extinction in the visible band	2.3
`ism.Rdust`	R_DD	Radius of the diffuse dust region embedding stars and MCs	2.3
`ism.f_PAH`	f_PAH	Fraction of the total DD luminosity radiated by PAH	2.3
`ism.dDDlow`	$δ_{DD}^{1}$ ${\delta _{{\rm{DD}}}^1}$	Extinction power-law index at wavelength < 100µm (10⁶Å)	2.3
`ism.dDDupp`	$δ_{DD}^{u}$ ${\delta _{{\rm{DD}}}^{\rm{u}}}$	Extinction power-law index at wavelength > 100µm (10⁶Å)	2.3

Nebular Free-Free

`nff.Zi`	Z_i	Average atomic number of ions	2.4.1

Synchrotron

`syn.alpha_syn`	α_syn	Spectral index	2.4.2
`syn.nu_self_syn`	v_self	Self-absorption frequency	2.4.2

Active Galactic Nucleus

`agn.fAGN`	f_AGN	AGN fraction	2.5

Templates

`agn.ct`	Θ	Torus half-aperture angle	—
`agn.al`	α	Density parameter (exponential part)	—
`agn.be`	β	Density parameter (power-law part)	—
`agn.ta`	$τ_{9.7}^{AGN}$ $\tau _{9.7}^{{\rm{AGN}}}$	Optical depth at 9.7µm	—
`agn.rm`	$R_{torus}^{AGN}$ ${R_{{\rm{torus}}}^{{\rm{AGGN}}}}$	Radial ratio of the torus	—
`agn.ia`	$Ψ_{los}^{AGN}$ ${{\rm{\Psi }}_{{\rm{los}}}^{{\rm{AGN}}}}$	Inclination angle	—

Notes. Each of the parameters in this Table (except for sfh.model and the Templates parameters of the Active Galactic Nucleus module) can be set as an additional free dimension for the sampler to explore.

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