Real Time Changing-State Quasar Detection

Real-Time Detection of Changing-State Quasars using a Mixture Density Network

2021.01 – 2025.12
AI HUBSystem Monitoring & Anomaly Detection
Outlier DetectionAstronomicalPhysicsTime Series

Motivation

A method for reliably detecting changes in the light curves of quasars (QSO) in real time and quantitatively describing these changes to facilitate easy understanding.

Methodology

  • Conducting data transformation using a physics-based formula on irregularly observed astronomical time series data.
  • The probability of being normal at each point in time is calculated using a distribution estimation model that utilizes conditional probabilities on the transformed data.
  • Detect outliers when data deviating from normal probability is input and define this as a changing state.

Contribution

  • Understanding the state changes of QSOs and identifying their physical mechanisms
  • Selectively identifying reliable targets for spectroscopic follow-up observations to improve follow-up efficiency
  • Understanding and exploring supermassive black holes