Fig. 13
Comparison of the optical spectrum of AT 2019avd with those of the three nuclear transients recently identified as a new class of flares from accreting SMBHs in Trakhtenbrot et al. (2019a). The two dashed grey lines mark the positions of N III 4640 Å and He II 4686 Å. All objects share high F(He II 4686 Å)/F(Hβ), and at least one Bowen emission line (N III 4640 Å).
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