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Multi-frequency Black Hole Imaging for the Next-Generation Event Horizon Telescope by Chael, Andrew; Issaoun, Sara; Pesce, Dominic W.; Johnson, Michael D.; Ricarte, Angelo; Fromm, Christian M.; Mizuno, Yosuke is a scholarly article available to read on EtoBox.

What is Multi-frequency Black Hole Imaging for the Next-Generation Event Horizon Telescope about?

The Event Horizon Telescope (EHT) has produced images of the plasma flow around the supermassive black holes in Sgr A* and M87* with a resolution comparable to the projected size of their event horizons. Observations with the next-generation Event Horizon Telescope (ngEHT) will have significantly improved Fourier plane coverage and will be conducted at multiple frequency bands (86, 230, and 345 GHz), each with a wide bandwidth. At these frequencies, both Sgr A* and M87* transition from optically thin to optically thick. Resolved spectral index maps in the near-horizon and jet-launching regions of these supermassive black hole sources can constrain properties of the emitting plasma that are degenerate in single-frequency images. In addition, combining information from data obtained at multiple frequencies is a powerful tool for interferometric image reconstruction, since gaps in spatial scales in single-frequency observations can be filled in with information from other frequencies. Here we present a new method of simultaneously reconstructing interferometric images at multiple frequencies along with their spectral index maps. The method is based on existing Regularized Maximum Like

Author

Chael, Andrew; Issaoun, Sara; Pesce, Dominic W.; Johnson, Michael D.; Ricarte, Angelo; Fromm, Christian M.; Mizuno, Yosuke

Published

2022

Language

EN