Astronomers are Starting to Understand the Quasar Lifecycle

Astronomers are Starting to Understand the Quasar Lifecycle
By Paul M. Sutter

Supermassive black holes have a complicated lifecycle. Sometimes they’re “on”, blasting out tremendous amounts of energy, and sometimes they’re “off’, where they sleep like dragons in their caves. By comparing the proportion of high-energy to low-energy waves emitted by quasars, astronomers are beginning to pin down how many black holes are sleeping, and when they’re …

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February 2, 2021 at 08:42PM
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