The head-tail radio galaxy and revived fossil plasma in Abell 1775

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Table 3.

Flux densities and spectral indices for the A1775 radio sources.

Source	Frequency	Flux density	Spectral index
	[MHz]	1[mJy]
Head	144	1249 ± 125	$α_{144}^{400} = 0.63 \pm 0.14$ $\alpha_{144}^{400}=0.63 \pm 0.14$
	400	653 ± 65	$α_{400}^{650} = 0.77 \pm 0.23$ $\alpha_{400}^{650}=0.77 \pm 0.23$
	650	448 ± 22
Inner Tail	144	1253 ± 125	$α_{144}^{400} = 1.06 \pm 0.14$ $\alpha_{144}^{400}=1.06 \pm 0.14$
	400	424 ± 42	$α_{400}^{650} = 1.44 \pm 0.23$ $\alpha_{400}^{650}=1.44 \pm 0.23$
	650	211 ± 10
Outer Tail	144	372 ± 37	$α_{144}^{400} = 1.55 \pm 0.14$ $\alpha_{144}^{400}=1.55 \pm 0.14$
	400	76 ± 7.6	$α_{400}^{650} = 2.23 \pm 0.23$ $\alpha_{400}^{650}=2.23 \pm 0.23$
	650	26 ± 1.3
F1	144	466 ± 46	$α_{144}^{400} = 2.56 \pm 0.14$ $\alpha_{144}^{400}=2.56 \pm 0.14$
	400	34 ± 3.4	$α_{400}^{650} > 5.59$ $\alpha_{400}^{650} > 5.59$
	650	< 2.2
F2	144	375 ± 37	$α_{144}^{400} = 2.70 \pm 0.14$ $\alpha_{144}^{400}=2.70 \pm 0.14$
	400	23 ± 2.3	$α_{400}^{650} = 4.98 \pm 0.23$ $\alpha_{400}^{650}=4.98 \pm 0.23$
	650	2.1 ± 0.11

Notes. These measurements were performed at the three frequencies 144, 400, and 650 MHz, across the ‘head’, ‘inner’ tail, and ‘outer’ tail of the head-tail radio galaxy, as well as filaments F1 and F2. Spectral index values at high and low frequencies were derived from the integrated spectrum.

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