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Search for and study of extended emission-line regions (EELRs) related to AGNin early-type galaxies is interesting to probe the history of nuclearionization activity and also to understand the process of external gasaccretion. In this work, we present observations of the EELR in Mrk 78 obtainedat the 6-m Russian telescope using the long-slit and 3D spectroscopy methods.We show that ionized-gas clouds at the 12-16 kpc projected distances from thenucleus are ionized by the AGN radiation. Also we have checked if the galaxyappearing in the optical images in the immediate neighbourhood of Mrk 78 nearthe external clouds is a dwarf companion or a part of a tidal structure.However, the spectrum of this galaxy, SDSS J074240.37+651021.4, obtained at the6-m telescope corresponds to the distant background galaxy.

Extended ionized-gas structures in Seyfert 2 galaxy Mrk 78