2009AJ....137.3548P

We report the results of three-dimensional spectroscopic observations of Mrk 493 (narrow-line Seyfert 1 galaxy) with the integral-field spectrograph MultiPupil Fiber Spectrograph of the Special Astrophysical Observatory of the Russian Academy of Sciences 6 m telescope. The difference in the slope of the optical continuum emission intensity across the nucleus part and an extensive continuum emission region is detected. The emission in lines (Hα, Hβ, [O III], etc.) coincides with a composite nuclear region: an active galactic nucleus plus a circumnuclear star-forming ring observed in the Hubble Space Telescope UV/optical images. The [S II] emission region tends to be up to 1 kpc around the center. The Hα and Hβ could be decomposed into three components (broad ∼2000 km/s, intermediate ∼700 km/s, and narrow ∼250 km/s). We found that the width (∼750 km/s) of the Fe II lines corresponds to the intermediate component that may indicate a non-broad-line region (non-BLR) origin of the Fe II lines, or that a large fraction of the Fe II emission arises in the outer parts of the BLR. The weak broad component detected in the Hα, Hβ, and Heλ4686 may come from the unresolved central BLR, but also could be partly produced by violent starburst in the circumnuclear ring. Moreover, diagnostic diagrams clearly show the presence of the H II regions (not an Sy 1 nucleus) in the narrow-line region of Mrk 493.