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Galaxy Collisions Spark Active Galactic Nuclei, Study Finds

12/11/2025

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Summary

Story summary

The Euclid space telescope confirms that colossal galaxy collisions trigger active galactic nuclei (AGN).
AGN occur when supermassive black holes consume material, emitting radiation that can suppress star formation.
The Euclid team categorized a million galaxies.
Mergers yield two to six times more AGN than non-merging galaxies, making them the primary mechanism driving AGN activity, particularly for the most luminous types.

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Story summary

The Euclid space telescope confirms that colossal galaxy collisions trigger active galactic nuclei (AGN).
AGN occur when supermassive black holes consume material, emitting radiation that can suppress star formation.
The Euclid team categorized a million galaxies.
Mergers yield two to six times more AGN than non-merging galaxies, making them the primary mechanism driving AGN activity, particularly for the most luminous types.