Chemo-dynamics of the stellar component of the Sculptor dwarf galaxy - I. Observed properties

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Volume 692 (December 2024)

A&A, 692 (2024) A195

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Table 2

Best-fit parameters for the global properties of Sculptor’s stellar component.

One-population	m (dex/deg)	ℳ₀	σ_ℳ	𝒱 (km s⁻¹)	σ_𝒱 (km s⁻¹)	R_h (deg)	ΔBIC
All	${0.69}_{- 0.06}^{+ 0.06}$ $\[0.69_{-0.06}^{+0.06}\]$	$- {1.64}_{- 0.02}^{+ 0.02}$ $\[-1.64_{-0.02}^{+0.02}\]$	${0.400}_{- 0.008}^{+ 0.009}$ $\[0.400_{-0.008}^{+0.009}\]$	${111.2}_{- 0.3}^{+ 0.3}$ $\[111.2_{-0.3}^{+0.3}\]$	${9.7}_{- 0.2}^{+ 0.2}$ $\[9.7_{-0.2}^{+0.2}\]$	${0.207}_{- 0.005}^{+ 0.005}$ $\[0.207_{-0.005}^{+0.005}\]$	0

Two-populations	f	ℳ	σ_ℳ	𝒱 (km s⁻¹)	σ_𝒱 (km s⁻¹)	R_h (deg)	ΔBIC

MR	${0.34}_{- 0.04}^{+ 0.04}$ $\[0.34_{-0.04}^{+0.04}\]$	$- {1.44}_{- 0.03}^{+ 0.03}$ $\[-1.44_{-0.03}^{+0.03}\]$	${0.27}_{- 0.02}^{+ 0.02}$ $\[0.27_{-0.02}^{+0.02}\]$	${111.0}_{- 0.4}^{+ 0.4}$ $\[111.0_{-0.4}^{+0.4}\]$	${6.4}_{- 0.3}^{+ 0.3}$ $\[6.4_{-0.3}^{+0.3}\]$	${0.129}_{- 0.008}^{+ 0.008}$ $\[0.129_{-0.008}^{+0.008}\]$	−40
MP	${0.66}_{- 0.04}^{+ 0.04}$ $\[0.66_{-0.04}^{+0.04}\]$	$- {2.02}_{- 0.02}^{+ 0.02}$ $\[-2.02_{-0.02}^{+0.02}\]$	${0.34}_{- 0.01}^{+ 0.01}$ $\[0.34_{-0.01}^{+0.01}\]$	${111.3}_{- 0.4}^{+ 0.4}$ $\[111.3_{-0.4}^{+0.4}\]$	${11.1}_{- 0.3}^{+ 0.3}$ $\[11.1_{-0.3}^{+0.3}\]$	${0.27}_{- 0.01}^{+ 0.01}$ $\[0.27_{-0.01}^{+0.01}\]$

Three-populations	f	ℳ	σ_ℳ	𝒱 (km s⁻¹)	σ_𝒱 (km s⁻¹)	R_h(deg)	ΔBIC

MR	${0.32}_{- 0.03}^{+ 0.03}$ $\[0.32_{-0.03}^{+0.03}\]$	$- {1.41}_{- 0.03}^{+ 0.03}$ $\[-1.41_{-0.03}^{+0.03}\]$	${0.25}_{- 0.02}^{+ 0.02}$ $\[0.25_{-0.02}^{+0.02}\]$	${111.1}_{- 0.4}^{+ 0.4}$ $\[111.1_{-0.4}^{+0.4}\]$	${6.5}_{- 0.3}^{+ 0.3}$ $\[6.5_{-0.3}^{+0.3}\]$	${0.126}_{- 0.007}^{+ 0.008}$ $\[0.126_{-0.007}^{+0.008}\]$
MP	${0.66}_{- 0.03}^{+ 0.03}$ $\[0.66_{-0.03}^{+0.03}\]$	$- {2.00}_{- 0.02}^{+ 0.02}$ $\[-2.00_{-0.02}^{+0.02}\]$	${0.30}_{- 0.01}^{+ 0.01}$ $\[0.30_{-0.01}^{+0.01}\]$	${110.9}_{- 0.4}^{+ 0.4}$ $\[110.9_{-0.4}^{+0.4}\]$	${10.8}_{- 0.3}^{+ 0.3}$ $\[10.8_{-0.3}^{+0.3}\]$	${0.26}_{- 0.01}^{+ 0.01}$ $\[0.26_{-0.01}^{+0.01}\]$	−69
Pop 3	${0.017}_{- 0.005}^{+ 0.007}$ $\[0.017_{-0.005}^{+0.007}\]$	$- {2.9}_{- 0.2}^{+ 0.3}$ $\[-2.9_{-0.2}^{+0.3}\]$	${0.5}_{- 0.1}^{+ 0.1}$ $\[0.5_{-0.1}^{+0.1}\]$	${125.5}_{- 2.6}^{+ 2.4}$ $\[125.5_{-2.6}^{+2.4}\]$	${7.7}_{- 1.7}^{+ 2.3}$ $\[7.7_{-1.7}^{+2.3}\]$	${1.32}_{- 0.5}^{+ 0.9}$ $\[1.32_{-0.5}^{+0.9}\]$

Notes. Best fit parameters for the three models explored for the chemo-dynamical analysis. Col. 1 lists the population the parameter is referring to; Col. 2 shows the fraction of the total stars belonging to that population; Cols. 3 and 4 list mean and dispersion for the metallicity distribution; Cols. 5 and 6 list the mean and dispersion for the velocity distribution; Col. 7 show the half-light radius of the Plummer number density profile. It is important to note that since this profile does not fit properly the density distribution of the third population, its R_h should not be considered representative; finally, Col. 8 lists the difference of the BIC between the one-population model and the other models.

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