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The processes that trigger Active Galactic Nuclei (AGN) remain poorlyunderstood. While lower luminosity AGN may be triggered by minor disturbancesto the host galaxy, stronger disturbances are likely required to triggerluminous AGN. Major wet mergers of galaxies are ideal environments for AGNtriggering since they provide large gas supplies and galaxy scale torques.There is however little observational evidence for a strong connection betweenAGN and major mergers. We analyse the morphological properties of AGN hostgalaxies as a function of AGN and host galaxy luminosity and compare them to acarefully matched sample of control galaxies. AGN are X-ray selected in theredshift range 0.5 < z < 0.8 and have luminosities 41 < log(L_X [erg/s]) <44.5. 'Fake AGN' are simulated in the control galaxies by adding point sourceswith the magnitude of the matched AGN. We find that AGN host and controlgalaxies have comparable assymetries, Sersic indices and ellipticities atrestframe ~950nm. AGN host galaxies show neither higher average asymmetries norhigher fractions of very disturbed objects. There is no increase in theprevalence of merger signatures with AGN luminosity. At 95% confidence we findthat major mergers are responsible for <6% of all AGN in our sample as well as<40% of the highest luminosity AGN log(L_X [erg/s]) ~ 43.5). Major mergerstherefore either play only a very minor role in the triggering of AGN in theluminosity range studied or time delays are too long for merger features toremain visible.

Morphologies of z~0.7 AGN Host Galaxies in CANDELS: No trend of merger incidence with AGN luminosity