Investigating the dark matter halo of NGC 5128 using a discrete dynamical model

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Volume 685 (May 2024)

A&A, 685 (2024) A132

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Table 2.

Mass modeling results.

Model	Υ_K ^(a)	log(ρ_s) ^(b)	r_s ^(c)	β_red ^(d)	β_blue ^(e)	β_PNe ^(f)	β_dwarf ^(g)
		log(M_⊙ pc⁻³)	(kpc)
Fiducial	${1.6}_{- 0.3}^{+ 0.2}$ $\mathbf{{1.6}^{+0.2}_{-0.3}}$	$- 3 . 14_{- 0.33}^{+ 0.37}$ $\mathbf{-3.14^{+0.37}_{-0.33}}$	$77 . 5_{- 28.9}^{+ 44.5}$ $\mathbf{77.5^{+44.5}_{-28.9}}$	$- 0 . 28_{- 0.07}^{+ 0.08}$ $\mathbf{-0.28^{+0.08}_{-0.07}}$	$- 0 . 34_{- 0.05}^{+ 0.07}$ $\mathbf{-0.34^{+0.07}_{-0.05}}$	$- 0 . 11_{- 0.08}^{+ 0.08}$ $\mathbf{-0.11^{+0.08}_{-0.08}}$	$- 0 . 13_{- 0.18}^{+ 0.27}$ $\mathbf{-0.13^{+0.27}_{-0.18}}$
GCs only	$1 . 3_{- 0.3}^{+ 0.3}$ $1.3^{+0.3}_{-0.3}$	$- 3 . 02_{- 0.52}^{+ 0.41}$ $-3.02^{+0.41}_{-0.52}$	$76 . 7_{- 33.1}^{+ 88.7}$ $76.7^{+88.7}_{-33.1}$	$- 0 . 26_{- 0.08}^{+ 0.09}$ $-0.26^{+0.09}_{-0.08}$	$- 0 . 32_{- 0.06}^{+ 0.08}$ $-0.32^{+0.08}_{-0.06}$	…	…
PNe only	$1 . 3_{- 0.2}^{+ 0.2}$ $1.3^{+0.2}_{-0.2}$	$- 1 . 91_{- 0.26}^{+ 0.23}$ $-1.91^{+0.23}_{-0.26}$	$12 . 8_{- 3.1}^{+ 4.7}$ $12.8^{+4.7}_{-3.1}$	…	…	$- 0 . 20_{- 0.09}^{+ 0.08}$ $-0.20^{+0.08}_{-0.09}$	…
Dwarfs only	$1 . 1_{- 0.3}^{+ 0.3}$ $1.1^{+0.3}_{-0.3}$	$- 2 . 45_{- 0.74}^{+ 0.45}$ $-2.45^{+0.45}_{-0.74}$	$36 . 9_{- 12.9}^{+ 40.5}$ $36.9^{+40.5}_{-12.9}$	…	…	…	$- 0 . 09_{- 0.23}^{+ 0.28}$ $-0.09^{+0.28}_{-0.23}$
Isotropic	$1 . 2_{- 0.3}^{+ 0.3}$ $1.2^{+0.3}_{-0.3}$	$- 2 . 61_{- 0.28}^{+ 0.27}$ $-2.61^{+0.27}_{-0.28}$	$43 . 6_{- 12.3}^{+ 19.3}$ $43.6^{+19.3}_{-12.3}$	…	…	…	…
Inclination = 60°	$1 . 5_{- 0.3}^{+ 0.3}$ $1.5^{+0.3}_{-0.3}$	$- 2 . 91_{- 0.35}^{+ 0.32}$ $-2.91^{+0.32}_{-0.35}$	$58 . 7_{- 19.1}^{+ 35.2}$ $58.7^{+35.2}_{-19.1}$	$- 0 . 30_{- 0.07}^{+ 0.09}$ $-0.30^{+0.09}_{-0.07}$	$- 0 . 33_{- 0.05}^{+ 0.07}$ $-0.33^{+0.07}_{-0.05}$	$- 0 . 10_{- 0.11}^{+ 0.09}$ $-0.10^{+0.09}_{-0.11}$	$- 0 . 06_{- 0.24}^{+ 0.27}$ $-0.06^{+0.27}_{-0.24}$
Cored	$2 . 3_{- 0.1}^{+ 0.1}$ $2.3^{+0.1}_{-0.1}$	$- 2 . 87_{- 0.22}^{+ 0.22}$ $-2.87^{+0.22}_{-0.22}$	$131 . 4_{- 23.1}^{+ 32.1}$ $131.4^{+32.1}_{-23.1}$	$- 0 . 32_{- 0.06}^{+ 0.07}$ $-0.32^{+0.07}_{-0.06}$	$- 0 . 35_{- 0.04}^{+ 0.06}$ $-0.35^{+0.06}_{-0.04}$	$- 0 . 20_{- 0.09}^{+ 0.08}$ $-0.20^{+0.08}_{-0.09}$	$- 0 . 15_{- 0.17}^{+ 0.26}$ $-0.15^{+0.26}_{-0.17}$

Notes. The best-fit parameters for all the dynamical models. The fiducial model is first and highlighted in bold characters (Sect. 4.1). The next set of fits are for variations in the tracer population (Sect. 4.2), and the final set of fits are variations in the model assumptions (Sect. 4.3).

^(a)

The K-band stellar mass-to-light ratio Υ_K.

^(b)

The log NFW scale density.

^(c)

The NFW scale radius r_s.

^(d)

Velocity anisotropy β for the red GCs.

^(e)

Velocity anisotropy β for the blue GCs.

^(f)

Velocity anisotropy β for the PNe.

^(g)

Velocity anisotropy β for the dwarf satellite galaxies.

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