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Table 2.
Overview of the modelling ingredients and normalisations for M 51.
| Component | Parameter | Value |
|---|---|---|
| M 51a | ||
| Old stellar population | ||
| Bulge | n | 0.995 |
| q | 0.817 | |
| Re [pc] | 621.1 | |
| Normalisation |  |
0.54 × 109 |
| Disc | 2D geometry | IRAC 3.6 μm |
| hdisc, z [pc] | 390.8 | |
| Normalisation |  |
3.67 × 109 |
| Young non-ionising stellar population | ||
| Disc | 2D geometry | GALEX FUV |
| hdisc, z [pc] | 195.4 | |
| Normalisation | Lyni, FUV [L⊙] | 2.15 × 1010 |
| Young ionising stellar population | ||
| Disc | 2D geometry | Hα + 0.031 × MIPS 24 μm |
| hdisc, z [pc] | 97.7 | |
| Normalisation | Lyi, FUV [L⊙] | 6.61 × 109 |
| M 51b | ||
| Old stellar population | ||
| Bulge | n | 2.58 |
| q | 0.564 | |
| Re [pc] | 222.4 | |
| Normalisation |  |
0.37 × 109 |
| Disc | 2D geometry | IRAC 3.6 μm |
| hdisc, z [pc] | 370.9 | |
| Normalisation |  |
1.11 × 109 |
| M 51 | ||
| Dust | ||
| Disc | 2D geometry | FUV attenuation map |
| hdisc, z [pc] | 195.4 | |
| Normalisation | Mdust [M⊙] | 3.40 × 107 |
Notes. The normalisations are the initial values in our parameter space, as derived from the CIGALE SED fitting of M 51. Bulge parameters: n is the Sérsic index, q is the intrinsic flattening factor, and Re is the effective radius.
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