Validation of the accuracy and precision of Gaia EDR3 parallaxes with globular clusters

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Table 5

Membership and astrometric results for the globular clusters and the reference SMC field in this paper used for the 47 Tuc analysis.

ID	N_*,0	N_*	t_ϖ	t_{μ_α*}	t_{μ_δ}	ϖ_g		μ_α*,g		μ_δ,g		d	d_lit	Ref.
						(μas)		(mas a⁻¹)		(mas a⁻¹)		(kpc)	(kpc)
ω Cen	6865	6814	1.02	6.73	6.22	192.8	± 9.6	−3.258	± 0.020	−6.749	± 0.020	5.25	5.2	H10
													5.19	W15
													5.44	C20
													5.24 ± 0.11	S21
47 Tuc	15 350	15 298	1.03	4.74	4.76	227.8	± 9.7	+5.260	± 0.020	−2.567	± 0.020	4.42	4.81 ± 0.18	R05
													4.5	H10
													4.15 ± 0.08	W15
													4.45 ± 0.12	C18
													4.55 ± 0.03	T20
													4.50 ± 0.07	T20
													4.53 ± 0.06	TW
SMC	1904	1900	0.93	1.51	1.38	22.8	± 9.0	+0.506	± 0.018	−1.275	± 0.018	–	–	–
NGC 6752	2793	2784	1.00	4.01	4.15	256.5	± 10.2	−3.175	± 0.022	−4.044	± 0.022	3.92	4.0	H10
													4.02	W15
													4.06	C20
M5	1210	1206	0.94	2.74	2.64	137.3	± 10.4	+4.083	± 0.022	−9.863	± 0.022	7.46	8.28 ± 0.31	R05
													7.5	H10
													7.79	W15
													7.62	C20
NGC 6397	4090	4082	0.93	4.40	4.83	418.5	± 10.1	+3.239	± 0.022	−17.649	± 0.022	2.40	2.3	H10
													2.39	W15
													2.40	C20
M 13	1850	1848	1.06	3.06	2.98	128.1	± 10.3	−3.128	± 0.022	−2.564	± 0.022	8.02	7.98 ± 0.29	R05
													7.1	H10
													7.24	C20

Notes. N_*,0 and N_* are the number of objects before and after the normalized parallax 4σ cut; t_ϖ, , are reduced-χ²-like statistics for those three quantities; ϖ_g, μ_α*,g, and μ_δ,g are the derived astrometric values; and d is the distance after applying a flat prior truncated at 20 kpc.

References. C18: Chen et al. (2018). C20: Cerny et al. (2020). H10: Harris (2010). R05: Recio-Blanco et al. (2005). S21: Soltis et al. (2021). T20: Thompson et al. (2020). TW: This work using the SMC as reference. W15: Watkins et al. (2015).

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