Resolve the spectroscopic classification of NGC 1275

Determine the definitive spectroscopic classification of NGC 1275, including whether it should be classified as a type 1.5 Seyfert, a type 2 AGN, or another AGN subclass.

Background

The paper notes that NGC 1275 has been assigned different Seyfert classifications in the literature, with the classification depending on the observing campaign and data quality. The authors describe the source as currently accepted as a type 1.5 Seyfert radio galaxy but emphasize that its classification remains unresolved; some studies have classified it as type 2, while others have been unable to reach a definite conclusion. This classification uncertainty motivates the model’s adoption of a broad-line region while acknowledging the possible changing-look nature of the source.

References

NGC 1275 is currently accepted as a type 1.5 Seyfert radio galaxy. However, a review of the literature suggests its classification is still not fully understood. Its classification seems to depend on the time of observing campaigns and the data quality. Some studies classified it as a type 2, while others could not reach a definite conclusion \citep[see][and references within]{punsly2018revealing, marin2025spectropolarimetry}.

— Compton-induced HE -- VHE $γ$-rays from pair cascade emissions in the SEDs of radio galaxies: NGC 1275  (2609.08787 - Ntshatsha et al., 8 Sep 2026) in Section 6, “Summary and conclusion”