Zooming into the neutrino-associated blazar candidate J1718+4239

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Table A.1.

Radio flux densities of J1718+4239 from the literature and our new VLBA observations.

Frequency	Survey	Date	Flux density	Restoring beam size	Reference
144 MHz	LoTSS	2019-11-24	27.6 ± 6.5	20″×20″	Shimwell et al. (2022)
1.4 GHz	NVSS	1995-03-12	13.3 ± 0.6	45″×45″	Condon et al. (1998)
1.4 GHz	FIRST	1997-02-17	43.3 ± 0.1	$5 \overset{″}{.} 4 \times 5 \overset{″}{.} 4$ $5{{\overset{\prime\prime}{.}}}4\times5{{\overset{\prime\prime}{.}}}4$	White et al. (1997)
1.4 GHz	RACS	2020-12-29	21.5 ± 3.7	$10 \overset{″}{.} 3 \times 42 \overset{″}{.} 4$ $10{{\overset{\prime\prime}{.}}}3\times42{{\overset{\prime\prime}{.}}}4$	Duchesne et al. (2024)
3 GHz	VLASS	2019-05-06	30.3 ± 0.2	$2 \overset{″}{.} 4 \times 3 \overset{″}{.} 0$ $2{{\overset{\prime\prime}{.}}}4\times3{{\overset{\prime\prime}{.}}}0$	Gordon et al. (2020, 2021)
3 GHz	VLASS	2021-10-08	61.6 ± 1.1	$2 \overset{″}{.} 4 \times 3 \overset{″}{.} 0$ $2{{\overset{\prime\prime}{.}}}4\times3{{\overset{\prime\prime}{.}}}0$	Gordon et al. (2020, 2021)
3 GHz	VLASS	2024-08-02	90.5 ± 1.6	$2 \overset{″}{.} 2 \times 2 \overset{″}{.} 8$ $2{{\overset{\prime\prime}{.}}}2\times2{{\overset{\prime\prime}{.}}}8$	Gordon et al. (2020, 2021)
4.5 GHz	VLBA	2024-08-04	85.4 ± 4.9	1.4 mas × 4.1 mas	this work
4.85 GHz	GB6	1986-11–1987-10	38 ± 5	$3 \overset{'}{.} 4 \times 3 \overset{'}{.} 6^{†}$ $3{{\overset{\prime}{.}}}4\times3{{\overset{\prime}{.}}}6^{\dagger}$	Gregory et al. (1996)
6.7 GHz	VLBA	2024-08-04	93.6 ± 5.1	0.9 mas × 2.7 mas	this work
8.4 GHz	CLASS	1998-04-05	46 ± 0.2	$0 \overset{″}{.} 4 - 0 \overset{″}{.} 6^{† †}$ $0{{\overset{\prime\prime}{.}}}4-0{{\overset{\prime\prime}{.}}}6^{\dagger\dagger}$	Jackson et al. (2007), Myers et al. (2003)

Notes.^† FWHM of point source response. ^†† X-band resolution of VLA in A configuration, considering natural weighting and snapshot observation corrections.

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