Detection of Coronal Magnetic Activity in Nearby Active Supermassive Black Holes

Understand

Central supermassive black holes of active galactic nuclei host hot plasma with a temperature of $10^9$ K, namely coronae.

• Like the Sun, black hole coronae are theoretically believed to be heated by their magnetic activity, which have never been observed yet.
• Here we report the detection of coronal radio synchrotron emission from two nearby Seyfert galaxies using the Atacama Large Millimeter/submillimeter Array, the Karl G.
• Jansky Very Large Array, and Australia Telescope Compact Array.