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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Table 3.

Black hole masses M_SMBH for NGC 1566 determined by different studies.

M_SMBH	Method	Reference
[10⁶ M_⊙]
$4 . 4_{- 2.3}^{+ 6.7}$ $4.4^{+6.7}_{-2.3}$	σ_*	This work
$2 . 5_{- 0.3}^{+ 0.2}$ $2.5^{+0.2}_{-0.3}$	FWHM	This work
8.6 ± 4.4	σ_*	Smajić et al. (2015)
3.0 ± 0.9	FWHM	Smajić et al. (2015)
8.3	σ_*	Woo & Urry (2002)
5	FWHM	Kriss et al. (1991)

Mean
5.3 ± 2.7

Notes. For clarity, we denote if the stellar velocity dispersion σ_* or the FWHM was used for mass determination.

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