Monitoring of the polarized H2O maser emission around the massive protostars W75N(B)-VLA 1 and W75N(B)-VLA 2

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Table 1.

Observational details.

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)
Observation	Antennas	Bandwidth	Spectral	Source	Restoring	Position	Peak	rms ^(a)	σ_s.−n.^(b)	P_l^(c)	Polarization
date			channels	name	beam size	angle	intensity (I)				angle
		(MHz)			(mas × mas)	(°)	()	()	()	(%)	(°)
17 June 2014	Ef, On, Nt, Tr, Ys, Mh	4	2048	W75N(B)	1.1 × 0.8	−60.02	– ^(d)	13	25	– ^(d)	– ^(d)
				J2040+4527 ^(e)	1.1 × 0.7	−62.40	0.029	0.6	–	–	–
				J2202+4216 ^(f)	1.5 × 0.8	−52.68	1.868	2.5	–	7.0	−64 ± 8 ^(g)
12 June 2016	Ef, Jb, Mc, Nt, Sr, Ys,	4	2048	W75N(B)	1.9 × 1.2	−86.02	– ^(h)	11	73	– ^(h)	– ^(h)
	Mh			J2040+4527 ^(e)	1.0 × 0.7	−86.84	0.026	0.7	–	–	–
				J2202+4216 ^(f)	1.5 × 1.0	+74.56	0.685	1.5	–	3.1	−61 ± 12 ⁽ⁱ⁾
				3C48 ^(j)	1.5 × 0.9	−59.93	0.016	1.1	–	< 21 ^(k)	−
09 June 2018	Ef, Jb, Mc, On, Nt, Tr,	8	4096	W75N(B)	1.2 × 1.0	+86.92	– ^(l)	14	28	– ^(l)	– ^(l)
	Sr, Ys, Mh			J2040+4527 ^(e)	1.1 × 0.8	−79.82	0.021	0.4	–	–	–
				J2202+4216 ^(f)	1.2 × 0.8	−61.91	0.765	1.7	–	4.0	+5 ± 1 ^(m)
				3C48 ^(j)	1.8 × 0.7	−42.47	0.125	0.5	–	4.2	−70 ± 1
25 Oct. 2020	Ef, Jb, Mc, On, Tr, Sr,	8	4096	W75N(B)	1.4 × 1.0	−53.96	– ⁽ⁿ⁾	13	12	– ⁽ⁿ⁾	– ⁽ⁿ⁾
	Ys, Mh			J2040+4527 ^(e)	1.3 × 0.9	−56.63	0.034	0.6	–	–	–
				J2202+4216 ^(f)	1.6 × 1.0	−75.93	1.011	2.2	–	3.8	+15 ± 1 ^(m)
				3C48 ^(j)	2.2 × 1.1	−38.84	0.027	0.3	–	6.4	−70 ± 1

Notes.

^(a)

The spectral rms (in italics) is measured in channels with no line emission. The rms of the radio continuum (in boldface) is obtained by averaging all the channels.

^(b)

Self-noise in the maser emission channels (e.g., Sault 2012). When more than one maser feature shows circularly polarized emission, we present here the self-noise of the weakest feature. When no circularly polarized emission is detected, we consider the self-noise of the brightest maser feature.

^(c)

Linear polarization fraction.

^(d)

See Tables A.1 and A.2.

^(e)

Phase-reference calibrator at 2.856° from W75N(B). The errors of α₂₀₀₀ and δ₂₀₀₀ are 0.68 mas and 0.80 mas, respectively (Petrov et al. 2011).

^(f)

Primary polarization calibrator.

^(g)

Calibrated using the maser feature VLA1.1.05, see Sect. 2.

^(h)

See Tables A.3 and A.4.

⁽ⁱ⁾

Calibrated using the value measured on 1st June 2016 by one of the Korean VLBI Network (KVN) antennas and calibrated by using 3C286 (priv. comm.).

^(j)

Secondary polarization calibrator.

^(k)

Considering a 3σ detection threshold.

^(l)

See Tables A.5 and A.6.

^(m)

Calibrated by using 3C48.

⁽ⁿ⁾

See Tables A.7 and A.8.

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