The transient event in NGC 1566 from 2017 to 2019 - I. An eccentric accretion disk and a turbulent, disk-dominated broad-line region unveiled by double-peaked Ca II and O I lines

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Fig. 4.

MUSE spectrum of NGC 1566 taken on 2015 September 24 (Spectrum 1; blue) and the synthesis fit of the stellar contribution with pPXF (orange). The residuals (red) give the clean nuclear emission lines spectrum. For the fit, we flagged all prominent line emission including the Fe II complex at ∼5300 Å. The most prominent telluric absorption bands are flagged (gray).

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