Spectral modelling of Cygnus A between 110 and 250 MHz - Impact on the LOFAR 21-cm signal power spectrum

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Volume 696 (April 2025)

A&A, 696 (2025) A56

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Table A.1.

Components of the old Cygnus A model obtained from VLA observations.

Name	Type	RA	Dec	I	α	MajorAxis	MinorAxis	Orientation
				(kJy)		(arcsec)	(arcsec)	(deg)
CygA_4_1GG	GAUSSIAN	$19^{h} 59^{m} 30 \overset{s}{.} 691$ $19^{\mathrm{h}}59^{\mathrm{m}}30{{\overset{\text{ s}}{.}}}691$	$+ 40 ° 43' 54 \overset{″}{.} 226$ $+40\circ43{\prime}54{{\overset{\prime\prime}{.}}}226$	4.263	−0.8	18.21	11.69	69.14
CygA_4_2GG	GAUSSIAN	$19^{h} 59^{m} 22 \overset{s}{.} 263$ $19^{\mathrm{h}}59^{\mathrm{m}}22{{\overset{\text{ s}}{.}}}263$	$+ 40 ° 44' 27 \overset{″}{.} 859$ $+40\circ44{\prime}27{{\overset{\prime\prime}{.}}}859$	4.164	−0.8	20.15	87.32	103.82
CygA_4_0GG	GAUSSIAN	$19^{h} 59^{m} 27 \overset{s}{.} 371$ $19^{\mathrm{h}}59^{\mathrm{m}}27{{\overset{\text{ s}}{.}}}371$	$+ 40 ° 44' 06 \overset{″}{.} 504$ $+40\circ44{\prime}06{{\overset{\prime\prime}{.}}}504$	1.768	−0.8	23.13	69.14	78.24
CygA_4_5GG	GAUSSIAN	$19^{h} 59^{m} 28 \overset{s}{.} 833$ $19^{\mathrm{h}}59^{\mathrm{m}}28{{\overset{\text{ s}}{.}}}833$	$+ 40 ° 44' 02 \overset{″}{.} 168$ $+40\circ44{\prime}02{{\overset{\prime\prime}{.}}}168$	1.394	−0.8	23.60	0	36.24
CygA_4_7GG	POINT	$19^{h} 59^{m} 30 \overset{s}{.} 024$ $19^{\mathrm{h}}59^{\mathrm{m}}30{{\overset{\text{ s}}{.}}}024$	$+ 40 ° 43' 58 \overset{″}{.} 388$ $+40\circ43{\prime}58{{\overset{\prime\prime}{.}}}388$	1.309	−0.8	–	–	–
CygA_4_3GG	GAUSSIAN	$19^{h} 59^{m} 24 \overset{s}{.} 073$ $19^{\mathrm{h}}59^{\mathrm{m}}24{{\overset{\text{ s}}{.}}}073$	$+ 40 ° 44' 18 \overset{″}{.} 226$ $+40\circ44{\prime}18{{\overset{\prime\prime}{.}}}226$	1.226	−0.8	25.73	0	35.31
CygA_4_4GG	GAUSSIAN	$19^{h} 59^{m} 24 \overset{s}{.} 980$ $19^{\mathrm{h}}59^{\mathrm{m}}24{{\overset{\text{ s}}{.}}}980$	$+ 40 ° 44' 09 \overset{″}{.} 455$ $+40\circ44{\prime}09{{\overset{\prime\prime}{.}}}455$	0.865	−0.8	34.47	0	158.91
CygA_4_6GG	GAUSSIAN	$19^{h} 59^{m} 25 \overset{s}{.} 564$ $19^{\mathrm{h}}59^{\mathrm{m}}25{{\overset{\text{ s}}{.}}}564$	$+ 40 ° 44' 21 \overset{″}{.} 868$ $+40\circ44{\prime}21{{\overset{\prime\prime}{.}}}868$	0.700	−0.8	21.55	0	66.46
CygA_4_11GG	POINT	$19^{h} 59^{m} 28 \overset{s}{.} 553$ $19^{\mathrm{h}}59^{\mathrm{m}}28{{\overset{\text{ s}}{.}}}553$	$+ 40 ° 43' 43 \overset{″}{.} 492$ $+40\circ43{\prime}43{{\overset{\prime\prime}{.}}}492$	0.066	−0.8	–	–	–
CygA_4_8GG	POINT	$19^{h} 59^{m} 20 \overset{s}{.} 591$ $19^{\mathrm{h}}59^{\mathrm{m}}20{{\overset{\text{ s}}{.}}}591$	$+ 40 ° 44' 17 \overset{″}{.} 513$ $+40\circ44{\prime}17{{\overset{\prime\prime}{.}}}513$	0.057	−0.8	–	–	–
CygA_4_9GG	GAUSSIAN	$19^{h} 59^{m} 23 \overset{s}{.} 597$ $19^{\mathrm{h}}59^{\mathrm{m}}23{{\overset{\text{ s}}{.}}}597$	$+ 40 ° 44' 44 \overset{″}{.} 562$ $+40\circ44{\prime}44{{\overset{\prime\prime}{.}}}562$	0.051	−0.8	31.08	0	112.37
CygA_4_10GG	POINT	$19^{h} 59^{m} 27 \overset{s}{.} 150$ $19^{\mathrm{h}}59^{\mathrm{m}}27{{\overset{\text{ s}}{.}}}150$	$+ 40 ° 43' 49 \overset{″}{.} 356$ $+40\circ43{\prime}49{{\overset{\prime\prime}{.}}}356$	0.001	−0.8	–	–	–

Notes. The flux density I and the spectral index α are estimated at a reference frequency of 73.8 MHz.

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