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 4

Global kinematic parameters of Sculptor.

Model	v_sys (km/s)	σ_los (km/s)	n (km/s/o)	θ (o)	B₁₂
Disp. (2)	${111.2}_{- 0.2}^{+ 0.2}$ $\[111.2_{-0.2}^{+0.2}\]$	${9.8}_{- 0.2}^{+ 0.2}$ $\[9.8_{-0.2}^{+0.2}\]$	−	−	0.6
Radial (1)	${111.2}_{- 0.2}^{+ 0.2}$ $\[111.2_{-0.2}^{+0.2}\]$	${9.8}_{- 0.2}^{+ 0.2}$ $\[9.8_{-0.2}^{+0.2}\]$	$- {4.0}_{- 1.5}^{+ 1.5}$ $\[-4.0_{-1.5}^{+1.5}\]$	$34_{- 17}^{+ 17}$ $\[34_{-17}^{+17}\]$

Model	v_los (km/s)	σ_los (km/s)	n (km/s/o)	θ (o)	B₁₂

Disp. (2)	${111.0}_{- 0.3}^{+ 0.3}$ $\[111.0_{-0.3}^{+0.3}\]$	${9.6}_{- 0.2}^{+ 0.2}$ $\[9.6_{-0.2}^{+0.2}\]$	−	−	−0.9
Radial (1)	${111.0}_{- 0.3}^{+ 0.3}$ $\[111.0_{-0.3}^{+0.3}\]$	${9.6}_{- 0.2}^{+ 0.2}$ $\[9.6_{-0.2}^{+0.2}\]$	$- {4.4}_{- 1.7}^{+ 1.7}$ $\[-4.4_{-1.7}^{+1.7}\]$	$32_{- 18}^{+ 18}$ $\[32_{-18}^{+18}\]$

Notes. The upper part lists the results for the whole dataset, while the lower part those obtained when we remove the stars of the third population. Column 1 lists the model the parameters are referred to; Cols. 2 and 3 show the mean and dispersion of the l.o.s. velocity distribution, respectively; Cols. 4 and 5 list the parameters related with the velocity gradient, i.e., its slope and the direction of the maximum velocity variation; Col. 6 shows the Bayes factor B₁₂ between the radial rotation model (1) and the dispersion model (2).

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