Finding active galactic nuclei through Fink

Understand

We present the Active Galactic Nuclei (AGN) classifier as currently implemented within the Fink broker.

• Features were built upon summary statistics of available photometric points, as well as color estimation enabled by symbolic regression.
• The learning stage includes an active learning loop, used to build an optimized training sample from labels reported in astronomical catalogs.
• Using this method to classify real alerts from the Zwicky Transient Facility (ZTF), we achieved 98.0% accuracy, 93.8% precision and 88.5% recall.