A spatially resolved radio spectral study of the galaxy M 51

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Table 3

Fitted parameters for the spectra of the spiral arm (SA), inter-arm (IA), and core (N5194c, N5195c) regions.

Region	S₀ (Jy)	H	EM (pc cm⁻⁶)	S₀ (Jy)	α₀	β
SA_syn	0.630 ± 0.036	−0.839 ± 0.039	2800 ± 990	0.697 ± 0.013	−0.777 ± 0.0089	−0.176 ± 0.013
IA_syn	0.459 ± 0.026	−0.914 ± 0.041	2000 ± 790	0.507 ± 0.026	−0.881 ± 0.024	−0.147 ± 0.034
N5194c_syn	0.293 ± 0.014	−0.746 ± 0.032	2710 ± 980	0.3119 ± 0.0071	−0.674 ± 0.012	−0.144 ± 0.016
N5195c_syn	0.0917 ± 0.0036	−0.865 ± 0.027	2040 ± 570	0.09924 ± 0.0021	−0.821 ± 0.0097	−0.132 ± 0.014

Notes. Columns (2)–(4) list the free–free absorption, and Cols. (5)–(7) list the curved spectral model. Both are fitted to the non-thermal radio continuum spectra.

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