A pilot very long baseline interferometry study of the SQUAB quasar sample featuring multiple Gaia detections

Open Access

Table 1.

Information about the VLBA observations.

Code	Frequency	Date	Target	Calibrator	Time	Telescopes ^a
	(GHz)	(YYYY/MM/DD)	(J2000)	(J2000)	(h)
bz94a1	1.63	2023/02/19	J1433+4842	J1439+4958	3.5	BR,FD,HN,KP,LA,NL,OV,PT,SC
bz94a2	1.63	2023/03/10	J1520+4211	J1521+4336	3.5	BR,FD,KP,LA,NL,OV,PT,SC
bz94a3	1.63	2023/02/13	J0928+5707	J0927+5717	3.5	BR,FD,KP,LA,NL,MK,OV,PT,SC
bz94b1	4.87	2023/02/27	J1433+4842	J1439+4958	3	BR,HN,LA,NL,OV,PT,SC
bz94b2	4.87	2023/03/08	J1520+4211	J1521+4336	3	BR,FD,HN,KP,LA,NL,OV,PT,SC
bz94b3	4.87	2023/02/14	J0928+5707	J0927+5717	3	BR,FD,HN,KP,LA,MK,NL,OV,PT,SC
bz94b4 ^b	4.87	2023/03/01	J1433+4842	J1439+4958	3	BR,FD,HN,KP,LA,NL,OV,PT,SC

Notes. Column 1: Observation code of the VLBA sessions. Column 2: Observing frequency. Column 3: Observation date. Column 4: The target of the observation session. Column 5: Phase calibrator of the phase referencing session. Column 6: Overall observing time of the session. Column 7: Participating telescopes of the VLBA observation.

VLBA telescopes participating in the observations: BR (Brewster), FD (Fort Davis), HN (Hancock), KP (Kitt Peak), LA (Los Alamos), MK (Mauna Kea), NL (North Liberty), OV (Owens Valley), PT (Pie Town), and SC (Saint Croix).

Since too many antennas failed in bz94b1, bz94b4 was performed as a compensatory session for J1433 in the C band.

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