Observations of carbon radio recombination lines with the NenuFAR telescope - I. Cassiopeia A and Cygnus A

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Table 2

Best fit and uncertainties of the grid exploration.

Cloud	T_e (K)	n_e (cm^–3)	T₀ ^(a) (K)	L^(a) (pc)	υ_t (km s⁻¹)	pth/k (10³ Kcm^–3)	pt/k (10⁵ K cm^–3)	EMCII (cm⁻⁶ pc)
Cas A –47	$45_{- 10}^{+ 5}$ $45\substack{+5\\-10}$	${2.7}_{- 0.0}^{+ 1.2} \times 10^{- 2}$ $2.7\substack{+1.2\\-0.0}\times 10^{-2}$	1700 ± 100	33.0 ± 0.5	${3.3}_{- 0.6}^{+ 0.5}$ $3.3\substack{+0.5 \\ -0.6}$	6.8–13.9	0.6–6.5	0.024–0.051
Cas A –38	$40_{- 3}^{+ 4}$ $40\substack{+4\\-3}$	${2.5}_{- 0.0}^{+ 0.0} \times 10^{- 2}$ $2.5\substack{+0.0\\-0.0}\times 10^{-2}$	1200 ± 100	20.5 ± 0.5	${4.7}_{- 1.3}^{+ 1.4}$ $4.7\substack{+1.4 \\ -1.3}$	6.6–7.9	0.8–10.7	0.012–0.013
Cas A 0	$52_{- 7}^{+ 19}$ $52\substack{+19\\-7}$	${1.4}_{- 0.1}^{+ 0.1} \times 10^{- 2}$ $1.4\substack{+0.1\\-0.1}\times 10^{-2}$	1000 ± 100	15.0 ± 0.5	${3.7}_{- 2.0}^{+ 1.9}$ $3.7\substack{+1.9 \\ -2.0}$	4.2–7.6	0.1–7.6	0.002–0.003
Cyg A 3.5	$77_{- 20}^{+ 82}$ $77\substack{+82\\-20}$	${1.8}_{- 0.2}^{+ 0.9} \times 10^{- 2}$ ${$1.8\substack{+0.9\\-0.2}\times 10^{-2}$}$	1600 ± 100	8.0 ± 0.5	${7.9}_{- 1.3}^{+ 1.4}$ $7.9\substack{+1.4 \\ -1.3}$	6.5–30.7	2.0–27.0	0.002–0.006

Notes. The uncertainties on T_e, n_e and ν_t are computed by taking the sets of parameters giving that are within 30% of the optimal χ². ^(a)The bounds on T₀and L are fixed around the optimal value for each, as they are poorly constrained in the adopted modelling.

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