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Dawson, L. Le Guillou, M. Landriau, M. Manera, M. Mezcua, M. Schubnell, M. Siudek, P. Doel, Ragadeepika Pucha, R. Joyce, R. Kehoe, R. Miquel, S. Ahlen, Satya Gontcho A Gontcho, S. Ferraro, S. Juneau, S. Nadathur, S. Panda, T. Claybaugh, T. Kisner, V. A. Fawcett, Wei-Jian Guo, W. J. Percival, Y.-Y. Mao, Z. Yu","submitted_at":"2026-06-01T18:00:00Z","abstract_excerpt":"Using the first spectroscopic data release from the Dark Energy Spectroscopic Instrument (DESI DR1), we search for AGN signatures in 1,678,787 low-redshift ($0.001 \\le z \\le 0.45$) line-emitting galaxies. Based on the [NII]-BPT emission-line ratio diagnostic, we identify AGN in 314,245/1,211,573 (25.9%) high-mass ($\\log (M_{\\star}/M_{\\odot}) > 9.5$) and 9648/467,214 (2.1%) dwarf ($\\log (M_{\\star}/M_{\\odot}) \\le 9.5$) galaxies. Among these AGN, 17,949 are broad-line candidates (BL-AGN) with broad H$\\alpha$ emission, enabling black hole (BH) mass estimates using single-epoch virial methods. 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