First polarization study of the M87 jet and active galactic nuclei at submillimeter wavelengths with ALMA

Open Access

Table 1.

VLBI sources observed on April 19, 2021, in Band 7.

Source		Coordinates		Calibration Intent^a	T_{on source}
Common Name	J2000 Name	RA (J2000)	Dec (J2000)		(min)
3C 279	J1256−0547	12:56:11.167	−05:47:21.52	Target 1	34.4
3C 273	J1229+0203	12:29:06.700	+02:03:08.60	Flux, Bandpass	25.8
M87	NGC 4486	12:30:49.412	+12:23:28.27	Target 2	16.9
4C 01.28	J1058+0133	10:58:29.604	+01:33:58.83	Polarization	10.5
S4 1144+40	J1146+3958	11:46:58.298	+39:58:34.28	…	7.5
PKS 1510-089	J1512−0905	15:12:50.533	−09:05:59.83	…	3.8
PKS 1335-127	J1337−1257	13:37:39.783	−12:57:24.70	…	3.8

non-VLBI scans^b
4C 01.28	J1058+0133	10:58:29.604	+01.33.58.83	Polarization	40.3
PKS 1243-072	J1246−0730	12:46:04.232	−07.30.46.575	Phase	24.7
3C 273	J1229+0203	12:56:11.167	−05:47:21.52	Flux, Bandpass	10.1

Notes.

^(a)

In addition to the specified intent, amplitude and phase gains were estimated on each observed source.

^(b)

These sources were observed by ALMA for calibration purposes during gaps in the VLBI schedules.

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