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Table 4.

Linear fit parameters of H2O maser features along VLA 1 and around VLA 2.

(1) (2) (3) (4) (5) (6) (7) (8)
Epoch m(a) q(a) PA ρ(b) Proper Motion (c) ⟨V⟩ (d) Vmax(e)
(°) (mas yr−1) (km s−1) (km s−1) (km s−1)
VLA 1
2014.46(e) 0.60 ± 0.03 −0.65 ± 0.72 +59 ± 2 +0.98 − − +11.7 +16.8
2016.45 0.44 ± 0.06 −3.11 ± 2.95 +66 ± 3 +0.87 − − +11.2 +16.4
2018.44 0.64 ± 0.10 −18.49 ± 5.10 +57 ± 6 +0.84 − − +11.3 +15.0
2020.82 0.99 ± 0.02 −6.76 ± 0.90 +45 ± 1 +1.00 − − +18.5 +26.3
VLA 2 – zone 2
2014.46 − − − − − − − −
2016.45 0.04 ± 0.01 −628 ± 10 +87 ± 1 +1.00 − − +2.0 +2.3
2018.44 −0.08 ± 0.01 −554 ± 10 −85 ± 1 −1.00 +2.7 +3.5
2020.82 0.30 ± 0.04 −750 ± 19 +73 ± 2 +0.95 +4.5 +9.3
VLA 2 – zone 4
2014.46 − − − − − − − −
2016.45 1.26 ± 0.32 −1358 ± 138 +38 ± 18 +0.91 − − +18.3 +20.7
2018.44 −7.33 ± 6.50 +2219 ± 2686 −8 ± 12 −0.62 − − +23.1 +28.2
2020.82 −6.15 ± 4.40 +1545 ± 1677 −9 ± 10 −0.57 +23.3 +27.2

Notes.

(a)

Considering the equation for a line y = mx + q.

(b)

Pearson product-moment correlation coefficient −1 ≤ ρ ≤ +1; ρ = +1 (ρ = −1) is total positive (negative) correlation, ρ = 0 is no correlation.

(c)

For the proper motion on the plane of the sky, we considered the distance of the median point (Δα, Δδ) of the line of one epoch from the line of the next epoch. The velocity reported for an epoch is always calculated with respect to the previous epoch. The errors are estimated considering the uncertainties of m and q of the two epochs between which the velocity is measured.

(d)

⟨V⟩ and Vmax are the mean and maximum velocities observed along the line of sight, respectively.

(e)

We did not consider in the fit the features VLA1.1.01, VLA1.1.02, VLA1.1.03, VLA1.1.05, and VLA1.1.06.

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