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2021-01-08 Abstract

Title:  Feature Extraction on Synthetic Black Hole Images with Neural Networks
Speaker:  Yao-Yu Joshua Lin (UIUC)
Date: January 08 at 14:30
Location: R521, General Building II
The Event Horizon Telescope (EHT) recently released the first horizon-scale images of the black hole in M87. Combined with other astronomical data, these images constrain the mass and spin of the black hole as well as the accretion rate and magnetic flux trapped on the black hole. An important question for EHT is how well key parameters such as spin and trapped magnetic flux can be extracted from present and future EHT data alone. Here we explore parameter extraction using a neural network trained on high-resolution synthetic images drawn from state-of-the-art simulations. We find that the neural network is able to recover spin and flux with high accuracy. We are particularly interested in interpreting the neural network output and understanding which features are used to identify, e.g., black hole spin. Using feature maps, we find that the network keys on low surface brightness feature in particular. In this talk, I would also talk about extended work on using deep learning on parameters estimation in radio interferometry as well.
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