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We present a study of the incidence of active galactic nucleus (AGN) in asample of major merging systems at 0.3<z<2.5. Galaxies in this merger samplehave projected separations between 3 to 15 kpc and are selected from theCANDELS/3D-HST catalogs using a peak-finding algorithm. AGNs in mergers andnon-mergers are identified on the basis of their X-ray emission, optical lines,mid-infrared colors, and radio emission. Among galaxies with adequatemeasurements to find potential AGNs, we find a similar fraction of AGNs inmergers (16.4%) compared to the fraction found in non-merging galaxies (15.4%).In mergers, this fraction is obtained by assuming that, in unresolvedobservations, only one of the merging galaxies is the AGN source. Thesimilarity between the fractions is possibly due to the higher availability ofcold gas at high redshifts, where the excess of nuclear activity as a result ofmerging is less important than at lower redshifts. Star-forming galaxies have ahigher incidence of AGNs than quiescent galaxies. In particular, starbursts inmergers are the most common sites of AGN activity since they present higher AGNfractions and black hole accretion rates. We find no clear correlation betweenthe black hole accretion rate and the galaxy properties (i.e., star-formationrate, stellar mass) in mergers and non-mergers. However, mergers seem to have ahigher correlation with star formation than non-mergers, which possiblyindicates that the merging process is starting to influence the star formationand AGN activity even at this pre-coalescence stage.

Galaxy mergers up to z < 2.5 II: AGN incidence of merging galaxies at separations of 3-15 kpc