Observing—and Imaging—Active Galactic Nuclei with the Event Horizon Telescope

Creators: Fish, Vincent L.; Akiyama, Kazunori; Bouman, Katherine L.; Chael, Andrew A.; Johnson, Michael D.; Doeleman, Sheperd S.; Blackburn, Lindy; Wardle, John F. C.; Freeman, William T.; Event Horizon Telescope Collaboration

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Abstract

Originally developed to image the shadow region of the central black hole in Sagittarius A* and in the nearby galaxy M87, the Event Horizon Telescope (EHT) provides deep, very high angular resolution data on other active galactic nucleus (AGN) sources too. The challenges of working with EHT data have spurred the development of new image reconstruction algorithms. This work briefly reviews the status of the EHT and its utility for observing AGN sources, with emphasis on novel imaging techniques that offer the promise of better reconstructions at 1.3 mm and other wavelengths.

Additional Information

© 2016 by the authors; licensee MDPI, Basel, Switzerland. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0). Received: 11 July 2016 / Revised: 13 October 2016 / Accepted: 15 October 2016 / Published: 27 October 2016. (This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes). This work is made possible by grants from the National Science Foundation and the Gordon and Betty Moore Foundation. Author Contributions: Vincent L. Fish wrote most of the article, with text and figure contributions from Kazunori Akiyama on BSSpM, from Katherine L. Bouman on CHIRP, and from Andrew A. Chael on Polarimetric MEM. All named authors of this work contributed to one or more of these imaging techniques (as listed in the references) and/or to the validation described in Section 2.5. The authors declare no conflict of interest.

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