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 3.

Mass modeling derived quantities.

Model	M_vir ^(a)	c_vir ^(b)	M_* ^(c)	M_vir, t ^(d)	f_{DM, 1R_eff} ^(e)	f_{DM, 5R_eff} ^(f)
	(10¹² M_⊙)		(10¹¹ M_⊙)	10¹² M_⊙	(%)	(%)
Fiducial	${4.4}_{- 1.4}^{+ 2.4}$ $\mathbf{4.4}^{\mathbf{+2.4}}_{\mathbf{-1.4}}$	${5.6}_{- 1.6}^{+ 2.4}$ $\mathbf{5.6}^{\mathbf{+2.4}}_{\mathbf{-1.6}}$	${1.9}_{- 0.3}^{+ 0.2}$ $\mathbf{1.9}^{\mathbf{+0.2}}_{\mathbf{-0.3}}$	$4 . 7_{- 1.4}^{+ 1.4}$ $4.7^{+1.4}_{-1.4}$	$10 . 7_{- 3.6}^{+ 3.9}$ $10.7^{+3.9}_{-3.6}$	51.9 $_{- 8.4}^{7.5}$ $^{7.5}_{-8.4}$
GCs only	$6 . 1_{- 2.6}^{+ 7.3}$ $6.1^{+7.3}_{-2.6}$	$6 . 3_{- 2.6}^{+ 3.0}$ $6.3^{+3.0}_{-2.6}$	$1 . 7_{- 0.3}^{+ 0.3}$ $1.7^{+0.3}_{-0.3}$	$6 . 1_{- 1.9}^{+ 3.9}$ $6.1^{+3.9}_{-1.9}$	14.0 $_{- 4.5}^{+ 5.6}$ $^{+5.6}_{-4.5}$	60.6 $_{- 7.6}^{+ 7.1}$ $^{+7.1}_{-7.6}$
PNe only	$0 . 7_{- 0.2}^{+ 0.3}$ $0.7^{+0.3}_{-0.2}$	$17 . 7_{- 3.8}^{+ 4.2}$ $17.7^{+4.2}_{-3.8}$	$1 . 7_{- 0.2}^{+ 0.2}$ $1.7^{+0.2}_{-0.2}$	$0 . 8_{- 0.2}^{+ 0.2}$ $0.8^{+0.2}_{-0.2}$	19.3 $_{- 4.6}^{+ 4.5}$ $^{+4.5}_{-4.6}$	51.3 $_{- 7.8}^{+ 7.1}$ $^{+7.1}_{-7.8}$
Dwarfs only	$3 . 3_{- 1.2}^{+ 2.0}$ $3.3^{+2.0}_{-1.2}$	$10 . 8_{- 5.5}^{+ 5.5}$ $10.8^{+5.5}_{-5.5}$	$1 . 4_{- 0.3}^{+ 0.3}$ $1.4^{+0.3}_{-0.3}$	$3 . 5_{- 1.0}^{+ 1.6}$ $3.5^{+ 1.6}_{-1.0}$	22.1 $_{- 9.8}^{+ 10.8}$ $^{+10.8}_{- 9.8}$	69.2 $_{- 13.2}^{+ 7.5}$ $^{+7.5}_{-13.2}$
Isotropic	$3 . 7_{- 0.9}^{+ 1.4}$ $3.7^{+1.4}_{-0.9}$	$9 . 3_{- 2.2}^{+ 2.7}$ $9.3^{+2.7}_{-2.2}$	$1 . 6_{- 0.3}^{+ 0.3}$ $1.6^{+0.3}_{-0.3}$	$3 . 8_{- 0.8}^{+ 0.8}$ $3.8^{+0.8}_{-0.8}$	18.9 $_{- 4.5}^{+ 6.5}$ $^{+6.5}_{-4.5}$	66.3 $_{- 7.6}^{+ 5.9}$ $^{+5.9}_{-7.6}$
Inclination = 60°	$3 . 7_{- 1.0}^{+ 1.9}$ $3.7^{+1.9}_{-1.0}$	$7 . 0_{- 2.0}^{+ 2.5}$ $7.0^{+2.5}_{-2.0}$	$1 . 8_{- 0.3}^{+ 0.3}$ $1.8^{+0.3}_{-0.3}$	$3 . 9_{- 0.9}^{+ 1.4}$ $3.9^{+1.4}_{-0.9}$	12.5 $_{- 3.5}^{+ 4.6}$ $^{+4.6}_{-3.5}$	56.2 $_{- 7.1}^{+ 6.1}$ $^{+6.1}_{-7.1}$
Cored	$4 . 5_{- 1.4}^{+ 2.1}$ $4.5^{+2.1}_{-1.4}$	$3 . 3_{- 0.4}^{+ 0.4}$ $3.3^{+0.4}_{-0.4}$	$2 . 6_{- 0.1}^{+ 0.1}$ $2.6^{+0.1}_{-0.1}$	$4 . 8_{- 1.2}^{+ 1.8}$ $4.8^{+1.8}_{-1.2}$	$0 . 5_{- 0.2}^{+ 0.3}$ $0.5^{+0.3}_{-0.2}$	$23 . 2_{- 4.9}^{+ 6.6}$ $23.2^{+6.6}_{-4.9}$

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 virial mass M_vir.

^(b)

The halo concentration c_vir = r_vir/r_s.

^(c)

The stellar mass of the galaxy M_*.

^(d)

The total mass M_vir, t = M_vir + M_* derived from the joint distribution of M_vir and M_*

^(e)

The dark matter fraction within 1R_eff.

^(f)

The dark matter fraction within 5R_eff.

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