Detection of jet precession in the active nucleus of M 81

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Table 3

Shifts in the M 81* brightness peak for several pairs of observing frequencies.

	Frequency pair (GHz)
	1.7–5.0	1.7–8.4	5.0–8.4	1.7–2.3	2.3–5.0	2.3–8.4

Method	Shift (mas)
Shell center^a	0.57 ± 0.21	0.74 ± 0.19	0.18 ± 0.13	0.31 ± 0.17	0.42 ± 0.14	0.59 ± 0.09
Cross-corr.^b	0.68 ± 0.22	0.77 ± 0.50	0.21 ± 0.10	0.35 ± 0.05	0.43 ± 0.25	0.65 ± 0.14

Notes.

^(a)

Taking the estimated center of the SN 1993J radio shell (at each epoch and frequency) as position reference.

^(b)

From the shift in the cross-correlation of SN 1993J images at different frequencies and similar epochs.

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