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Schubnell, M. Siudek, P. Doel, P. Martini, Ragadeepika Pucha, R. Alfarsy, R. Canning, R. Hviding, R. Kehoe, R. Miquel, S. Ahlen, S. BenZvi, S. E. Koposov, S. Gontcho A Gontcho, S. Juneau, T. Claybaugh, V. Manwadkar, Wei-Jian Guo, Yao-Yuan Mao","submitted_at":"2024-10-31T18:00:01Z","abstract_excerpt":"Using early data from the Dark Energy Spectroscopic Instrument (DESI) survey, we search for AGN signatures in 410,757 line-emitting galaxies. By employing the BPT emission-line ratio diagnostic diagram, we identify AGN in 75,928/296,261 ($\\approx$25.6%) high-mass ($\\log (M_{\\star}/\\rm M_{\\odot}) >$ 9.5) and 2,444/114,496 ($\\approx$2.1%) dwarf ($\\log (M_{\\star}/\\rm M_{\\odot}) \\leq$ 9.5) galaxies. Of these AGN candidates, 4,181 sources exhibit a broad H$\\alpha$ component, allowing us to estimate their BH masses via virial techniques. 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