Radio astrometry with chromatic AGN core positions

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Volume 505 / No 1 (October I 2009)

A&A, 505 1 (2009) L1-L4

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Table 1:

Position shifts in $\mu$ as assuming various values of $\beta$ , for a source with measured core-shift between $\nu _1$ = 2.3 GHz and $\nu _2$ = 8.4 GHz of $440~\mu$ as, the median value found by Kovalev et al. (2008).
$\beta$	$\Delta$ x_2.3	$\Delta$ x_8.4	(1- $\beta$ ) $\Delta$ x_8.4	$\Delta$ x $_{\rm ion}$	$\Delta$ x $_{\rm phase-delay}$
0.2	1928	1488	1190	29	326
0.4	1088	648	389	21	281
0.6	814	374	150	14	239
0.8	682	242	48	7	201
1.0	606	166	0	0	166
1.2	558	118	-24	-7	134
1.4	526	86	-34	-14	106
1.6	503	63	-38	-21	80
1.8	487	47	-38	-29	57
2.0	476	36	-36	-36	36

Notes: Cols. 2 and 3 give the deduced shifts from the jet base x₀ at 2.3 and 8.4 GHz; Col. 4 the ``reduced'' group-delay shift at 8.4 GHz; Col. 5 the ``ionospheric'' shift; Col. 6 the total difference between positions measured at 8.4 GHz using interferometer phase, and ionosphere-corrected group delays.

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