Studies of stationary features in jets: 3C 279 quasar - I. On-sky scattering and dynamics

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Volume 704 (December 2025)

A&A, 704 (2025) A208

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Table 1.

Estimates of intrinsic characteristics of the QSC and radio core for specified cadence ranges ΔT, with relative errors ε_r < 0.5.

ΔT	N	$\bar{s}$ $\overline{s}$	σ_s	rms_s ± δ_{rms_s}	$\bar{c}$ $\overline{c}$	$σ_{c} = {rms}_{c} \pm δ_{{rms}_{c}}$ $\sigma_{ \rm c} = \mathrm{rms}_{ \rm c} \pm \delta_\mathrm{rms_{ \rm c}}$	$\bar{Δ t} \pm σ_{\bar{Δ t}}$ $\overline{\Delta t} \pm \sigma_\mathrm{\overline{\Delta t}}$	$\bar{β_{s}} \pm σ_{\bar{β_{s}}}$ $\overline{\beta_{\mathrm{s}}} \pm \sigma_{\overline{\beta_{\mathrm{s}}}}$
(days)		(mas)	(mas)		(mas)	(mas)	(days)	(c)
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)
0–14	21	0.034	0.010	0.035 ± 0.007	−0.004	0.063 ± 0.002	7.41 ± 4.05	52.42 ± 7.16
14–33	22	0.019	0.010	0.021 ± 0.008	−0.004	0.034 ± 0.004	21.49 ± 5.10	10.00 ± 1.26
33–60	23	0.026	0.016	0.030 ± 0.014	0.017	0.060 ± 0.010	46.79 ± 8.49	6.38 ± 0.86
60–100	22	0.038	0.019	0.043 ± 0.008	−0.005	0.066 ± 0.004	80.38 ± 13.38	5.48 ± 0.62
100–365	21	0.052	0.015	0.054 ± 0.007	−0.013	0.058 ± 0.006	182.61 ± 74.12	3.29 ± 0.36

Notes. Columns are as follows: (1) ΔT is the range of observation time intervals (or cadences), (2) number of apparent displacements, (3) $\bar{s}$ $\overline{s}$ is the mean intrinsic apparent displacement of QSC, (4) σ_s is the standard deviation of the intrinsic displacements, (5) rms_s of the intrinsic displacements of QSC and its standard error, (6) $\bar{c}$ $\overline{c}$ is the mean displacement of the core, (7) rms_c of the displacements of the core and their standard errors, (8) mean and standard deviation of the cadences, (9) mean intrinsic apparent speed of QSC $\bar{β_{s}} = \bar{s} / \bar{Δ t}$ $\overline{\beta_{\mathrm{s}}}=\overline{s}/\overline{\Delta t}$ and its standard deviation.

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