Comparison of multifrequency positions of extragalactic sources from ICRF3 and Gaia EDR3

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Table 2

Spearman correlation coefficients between the optical-to-radio offsets and source properties for our sample of 512 sources.

	Nb Sources	S∕X	K	X∕Ka
ρ vs. SI	482	+ 0.20	+ 0.13	+ 0.12
		8 ×10⁻⁵	9 ×10⁻³	0.02
ρ vs. G	512	+ 0.41	+ 0.46	+ 0.44
		6 ×10⁻²²	3 ×10⁻²⁸	3 ×10⁻²⁶
X vs. G	512	− 0.22	− 0.09	− 0.14
		5 ×10⁻⁷	0.03	2 ×10⁻³
ρ vs. z	456	+ 0.04	+ 0.06	+ 0.04
		0.38	0.19	0.36

Notes. For each of the comparisons, the first row in the table indicates the correlation coefficient ρ_s, and the second row (in italics) provides the corresponding double-sided p-value. The p-value indicates the probability that the null hypothesis is rejected, i.e., that a correlation exists.

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