Prospects for studying million-degree gas in the Milky Way halo using the forbidden optical [Fe X] and [Fe XIV] intersystem lines

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Table 1

Predictions for detecting [Fe XIV] in future surveys.

⟨S/N⟩^a	$N_{stack}^{b}$ $\mathcal{N}_{\text {stack}}{}^{\mathrm{b}}$
10	6.3 × 10⁶
25	1.0 × 10⁶
50	2.5 × 10⁵
100	6.3 × 10⁴

Notes. ^a Average S/N per 50 km s⁻¹ wide bin element in individual spectra; ^b Number of usable spectra for stacking.

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