Narrow absorption lines from intervening material in supernovae - II. Galaxy properties

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Volume 700 (August 2025)

A&A, 700 (2025) A119

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Table 7

Key driver analysis of the relative importance of galaxy properties for the NaI D EW.

Feature	Relative importance	Normalised relative importance (%)
All properties - R² score = 0.36
$\bar{Δ α}$ $\overline{\Delta\alpha}$	0.079	30.7
$S F R_{0}^{L}$	0.043	16.8
T-type	0.034	13.2
$A_{V}^{L}$	0.032	12.5
$t_{a g e}^{L}$ $t_{\mathrm{age}}^L$	0.018	6.9
Local properties - R² score = 0.24
$\bar{Δ α}$ $\overline{\Delta\alpha}$	0.081	40.4
$A_{V}^{L}$	0.043	21.4
$S F R_{0}^{L}$	0.039	19.4
$t_{a g e}^{L}$ $t_{\mathrm{age}}^L$	0.020	9.9
n^L	0.009	4.2
Global properties - R² score = 0.11
T-type	0.029	45.0
i(°)	0.018	27.3
$A_{V}^{G}$	0.004	6.8
$S F R_{0}^{G}$	0.004	6.2
$Z_{*}^{G}$	0.003	5.4

Notes. We show only the five most relevant environmental properties in predicting the NaI D EW for three cases: (a) all properties, (b) local properties and (c) global properties. Of the offset parameters, we only used the normalised offset as input.

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