Testing kinematic distances under a realistic Galactic potential - Investigating systematic errors in the kinematic distance method arising from a non-axisymmetric potential

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Table 5

Kinematic distances and errors of five well-studied sources in the Galactic disk.

Source	l	$d_{true}^{w}$ $d_{{\rm{true }}}^{\rm{w}}$	$d_{kw}$ $d_{\rm{k}}^{\rm{w}}$	d_k	$\begin{array}{l} (d_{kw} - d_{true}^{w}) \\ / d_{true}^{w} \end{array}$ $\eqalign{ & \left( {d_{\rm{k}}^{\rm{w}} - d_{{\rm{true }}}^{\rm{w}}} \right) \cr & \,\,\,\,\,\,\,\,\,\,/d_{{\rm{true }}}^{\rm{w}} \cr}$	$\begin{array}{l} (d_{k} - d_{true}^{w}) \\ / d_{true}^{w} \end{array}$ $\eqalign{ & \left( {{d_k} - d_{{\rm{true }}}^{\rm{w}}} \right) \cr & \,\,\,\,\,\,\,\,\,\,/d_{{\rm{true }}}^{\rm{w}} \cr}$
	(degrees)	(kpc)	(kpc)	(kpc)
M17	15.03	1.97	2.33	1.10	0.18	−0.44
W49N	44.20	10.93	11.52	11.15	0.05	0.02
NML Cyg	80.80	1.6	1.33	1.32	−0.17	−0.18
AFGL 2789	94.60	3.49	5.48	3.21	0.57	−0.08
G240.31+00.07	−163.84	7.11	5.75	9.17	−0.19	0.29

Notes. For five Galactic sources (Col. 1), we list the longitude ℓ (Col. 2) and the true distance $d_{true}^{w}$ $d_{{\rm{true }}}^{\rm{w}}$ (Col. 3) derived from the maser parallax measurements reported by Wenger et al. (2018) as well as their KD estimate $d_{kw}$ $d_{\rm{k}}^{\rm{w}}$ (Col. 4) for comparison with the value d_k from our model. We also provide the corresponding relative KD errors in columns 6 and 7. Despite the simplicity of the physical processes included in our simulation, we find that our approach reproduces the observational data reasonably well.

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