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Table 3.

Parameters of the 22 GHz H2O maser features detected toward TXS 2226-184 in epochs 2017.45 (VLBA), 2017.83 and 2018.44 (EVN).

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)
Maser α2000 (a) δ2000 (b) Comp. Peak flux (c) Vlsr, radio (c) ΔvL (c) rms (c), (d) S/N rms ∫SdV(c) LH2O (e)
Density (I)
(h:m:s) (°′ :″) (mJy beam−1) (km s−1) (km s−1) (Jy km s−1) (L⊙)
VLBA
TXS.V01 22:29:12.4943 −18:10:47.2369 1 24.45 7404.8 ± 0.4 48.5 ± 0.9 4.0 11 (f) 1.83 1.26 ± 0.02 369 (f)
2 20.50 7403.7 ± 0.2 6.5 ± 0.3 0.14 ± 0.01
TXS.V02 22:29:12.4943 −18:10:47.2367 3 34.19 7402.0 ± 0.3 47.9 ± 0.9 4.7 23 (f) 2.15 1.74 ± 0.02 537 (f)
4 72.13 7403.91 ± 0.04 3.9 ± 0.1 0.30 ± 0.01
TXS.V03 22:29:12.4944 −18:10:47.2359 5 17.01 7404.6 ± 0.6 47.8 ± 1.3 4.5 8 (f) 2.06 0.86 ± 0.02 242 (f)
6 18.62 7403.4 ± 0.1 2.9 ± 0.3 0.06 ± 0.01
TXS.V04 22:29:12.4944 −18:10:47.2338 7 10.78 7363.5 ± 1.1 50.0 ± 3.8 4.6 6 (f) 2.11 0.57 ± 0.04 221 (f)
8 19.32 7362.3 ± 0.3 13.2 ± 1.1 0.27 ± 0.03
TXS.V05 22:29:12.4945 −18:10:47.2334 9 19.21 7364.0 ± 0.5 34.7 ± 1.4 4.4 11 (f) 2.02 0.71 ± 0.23 248 (f)
10 27.51 7360.6 ± 0.2 7.8 ± 0.5 0.23 ± 0.02
TXS.V06 22:29:12.4942 −18:10:47.2421 11 14.33 7197.5 ± 0.4 19.7 ± 1.3 4.3 3 1.97 0.30 ± 0.01 79
EVN
2017.83
TXS.E01 22:29:12.4944 −18:10:47.2367 12 23.76 7396.5 ± 1.0 68.9 ± 2.4 9.5 5 (f) 4.35 1.74 ± 0.05 491 (f)
13 24.03 7398.8 ± 0.3 4.6 ± 1.1 0.12 ± 0.02
2018.44
Maser α2000 δ2000 Component Peak flux (h) Vlsr, radio (h) ΔvL (h) rms (h), (d) S/N rms ∫SdV(h) LH2O (e)
offset (g) offset (g) Density (I)
(mas) (mas) (mJy beam−1) (km s−1) (km s−1) (Jy km s−1) (L⊙)
TXS.W01 0.000 0.000 14 34.52 7402.5 ± 0.1 43.7 ± 0.1 2.0 24 (f) 0.92 1.605 ± 0.005 480 (f)
15 39.60 7398.8 ± 0.1 5.01 ± 0.1 0.215 ± 0.002
TXS.W02 +2.608 +3.998 16 5.07 7357.2 ± 0.4 36.6 ± 1.0 1.3 34 (f) 0.60 0.198 ± 0.005 94 (f)
17 20.31 7357.6 ± 0.1 7.4 ± 0.1 0.160 ± 0.003

Notes. The columns are: the maser feature name, absolute position (right ascension and declination) or offset position with respect to the reference maser feature (for epoch 2018.44), identified component from the Gaussian fit, peak flux density, peak velocity (radio convention), linewidth of the maser feature, spectral noise per channel, signal-to-noise ratio, spectral noise per km s−1, integrated flux, isotropic luminosity.

(a)

VLBA: the error is ±0.2 mas. EVN (epoch 2017.83): the error is ±0.5 mas.

(b)

VLBA: the error is ±0.7 mas. EVN (epoch 2017.83): the error is ±1.9 mas.

(c)

Gaussian fit results after a boxcar smoothing of 10 channels.

(d)

The channel width is 0.21 km s−1.

(e)

Isotropic luminosities are derived from LH2O/[L⊙] = 0.023 × ∫S dV/[Jy km s−1]×D2/[Mpc2], where D = 107.1 Mpc (derived assuming H0 = 70 km s−1 Mpc−1, Kuo et al. 2018).

(f)

Estimated considering the sum of the two components.

(g)

No absolute position has been measured in this epoch.

(h)

Gaussian fit results after channels averaging to have a spectral channel width identical to epoch 2017.83 and after a boxcar smoothing of 10 channels.

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