Table 2.
Global parameters of NGC 891 as inferred by the HerBIE SED fitting code (see Sect. 4).
| Parameters | Global values |
|---|---|
| Mdust [M⊙] | (3.48 ± 0.22) × 107 |
| Msmall grains | (3.32 ± 0.37) × 106 |
| Mlarge grains | (3.15 ± 0.24) × 107 |
| Mgas/Mdust | 261 ± 26 |
| Tdust | (24.03 ± 0.34) K |
| Lstar [L⊙] | (6.80 ± 0.37) × 1010 |
| Ldust [L⊙] | (3.39 ± 0.13) × 1010 |
| ⟨U⟩ [2.2 × 105 W m−2] | 2.63 ± 0.95 |
| qAF | 0.10 ± 0.01 |
| fion | 0.21 ± 0.11 |
| β | 1.88 ± 0.47 |
| αs | 0.79 ± 0.07 |
Notes. In adapting the THEMIS model to HerBIE, qAF, the mass fraction of a-C(:H) lower than 15 Å, is an analog to the qPAH in the model of Draine & Li (2007), and fion, the mass of the a-C(:H) lower than 7 Å divided by the mass of a-C(:H) lower than 15 Å, is an analog to the fraction of ionized PAHs. HerBIE incorporates the ISRF of Mathis et al. (1983) with a mean intensity ⟨U⟩, normalized in the solar neighborhood, and it parameterizes the Rayleigh–Jeans spectral index β and the synchrotron spectral index αs.
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