New technique helps finds thousands of double-nuclei galaxies: DST

Out of these, 159 were confirmed to have pairs of accreting supermassive black holes (SMBH) or active galactic nuclei (AGN) as they are usually called. An accreting SMBH or AGN is a compact region at the centre of a galaxy that has a higher-than-normal luminosity over at least some portion of the electromagnetic spectrum with characteristics indicating that the luminosity is not produced by stars.

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