Dynamical mass distribution and velocity structure of the Galactic centre

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Volume 699 (July 2025)

A&A, 699 (2025) A239

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Table 2

Results of one-population dynamical models with a radial varying β_z and κ and with various gravitational components that were fitted.

Parameter	Free M_• Sect. 4.1	𝚼(r) Sect. 4.2	DM cusp γ=1 Sect. 4.3	DM core γ=0 Sect. 4.3
ϵ	2.4 ±0.2	2.4 ±0.2	2.4 ±0.2	2.4 ±0.2
β₀	$- {0.15}_{- 0.19}^{+ 0.11}$ $\[-0.15_{-0.19}^{+0.11}\]$	$- {0.13}_{- 0.18}^{+ 0.11}$ $\[-0.13_{-0.18}^{+0.11}\]$	$- {0.23}_{- 0.31}^{+ 0.15}$ $\[-0.23_{-0.31}^{+0.15}\]$	$- {0.22}_{- 0.27}^{+ 0.14}$ $\[-0.22_{-0.27}^{+0.14}\]$
β_∞	$- {0.15}_{- 0.09}^{+ 0.08}$ $\[-0.15_{-0.09}^{+0.08}\]$	$- {0.15}_{- 0.10}^{+ 0.09}$ $\[-0.15_{-0.10}^{+0.09}\]$	−0.07 ±0.10	−0.04 ±0.10
R_β	$58_{- 41}^{+ 275}$ $\[58_{-41}^{+275}\]$	$68_{- 50}^{+ 309}$ $\[68_{-50}^{+309}\]$	$53_{- 36}^{+ 322}$ $\[53_{-36}^{+322}\]$	$58_{- 41}^{+ 324}$ $\[58_{-41}^{+324}\]$
κ₀	$- {0.26}_{- 0.33}^{+ 0.35}$ $\[-0.26_{-0.33}^{+0.35}\]$	$- {0.32}_{- 0.38}^{+ 0.39}$ $\[-0.32_{-0.38}^{+0.39}\]$	$- {0.26}_{- 0.34}^{+ 0.38}$ $\[-0.26_{-0.34}^{+0.38}\]$	$- {0.23}_{- 0.35}^{+ 0.38}$ $\[-0.23_{-0.35}^{+0.38}\]$
κ_∞	−1.10 ±0.05	$- {1.09}_{- 0.06}^{+ 0.05}$ $\[-1.09_{-0.06}^{+0.05}\]$	−1.08 ±0.05	$- {1.11}_{- 0.06}^{+ 0.05}$ $\[-1.11_{-0.06}^{+0.05}\]$
R_κ	$17_{- 4}^{+ 8}$ $\[17_{-4}^{+8}\]$	$17_{- 4}^{+ 10}$ $\[17_{-4}^{+10}\]$	$17_{- 4}^{+ 8}$ $\[17_{-4}^{+8}\]$	$17_{- 4}^{+ 9}$ $\[17_{-4}^{+9}\]$
𝚼₀	...	${0.90}_{- 0.12}^{+ 0.28}$ $\[0.90_{-0.12}^{+0.28}\]$	...	...
𝚼_∞	...	0.68 ± 0.04	...	...
R_𝚼	...	$51_{- 35}^{+ 280}$ $\[51_{-35}^{+280}\]$	...	...
𝚼	0.72±0.03	...	${0.60}_{- 0.06}^{+ 0.08}$ $\[0.60_{-0.06}^{+0.08}\]$	${0.62}_{- 0.05}^{+ 0.07}$ $\[0.62_{-0.05}^{+0.07}\]$
M_•	${4.35}_{- 0.23}^{+ 0.24}$ $\[4.35_{-0.23}^{+0.24}\]$	(4.3)	(4.3)	(4.3)
log(ρ_S)	...	...	$- {0.57}_{- 0.37}^{+ 0.16}$ $\[-0.57_{-0.37}^{+0.16}\]$	${1.62}_{- 0.56}^{+ 0.15}$ $\[1.62_{-0.56}^{+0.15}\]$
Number of free parameters	9	10	9	9

Notes. The listed values are the medians of the posterior distributions, and the uncertainties are the 16th and 84th percentiles. The columns refer to the results in Sects. 4.1, 4.2, and 4.3. The units of R_β, R_κ, and R_𝚼 are in arcsec, M_• in is given 10⁶ M_⊙, and ϵ is listed in percent.

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