A statistical study of lopsided galaxies using random forests

Open Access

Table 1.

List of the internal parameters of the 7919 disk-like galaxies obtained from TNG50-1.

Parameters	Symbol	Description
Tidal Parameter¹	T_P	Represents the tidal force applied by the inner galaxy regions (R < R₅₀) to
		the materials located at distances equal to R₉₀. Defined as T_P = M₅₀/R₉₀³.
Central Stellar Mass Density	μ_*	Density of the stellar mass contained inside R₅₀. Defined as $μ_{star} = M_{50}^{} / π R_{50}^{2}$ $\mu_{\mathrm{star}}=M^{}_{50}/\pi R_{50}^2$ .
		Here $M_{50}^{}$ $M^{}_{50}$ represents the stellar mass within R₅₀.
Minor-to-major axis	c/a	Ratio between the minor axis c and major axis a. Describes the
		shape of the inner galactic regions.
Disk-to-total mass	D/T	Ratio between the disk’s mass and the total mass of the galaxy. Used to select
		disk-like galaxies.
Concentration	C	Ratio between R₉₀ and the effective radius R₅₀. Defined as C = R₉₀/R₅₀.
Effective Radius	R₅₀	Radius of the galaxy containing 50% of the stellar mass.
Disk Extension	R_ext	Defined as 1.4 times the radius of the galaxy containing 90% of
		the stellar mass (R₉₀).
Half-mass	M₅₀	Total (baryonic and dark matter) mass of the galaxy enclosed in R₅₀.
Star Formation Rate	SFR	Total stellar mass created from gas and dust, per year.
Spin Parameter¹	Λ(R)	Galactic disk stellar spin, which is a proxy of the apparent stellar angular
		momentum. Calculated within the inner stellar half-mass radius.

Notes. (1) Lagos et al. (2017).

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