Complex emission line region of Mrk 817

Abstract

In this work, we study the physical and kinematical properties of the emission line region of the Seyfert 1.5 galaxy Mrk 817 using three sets of observations, among which are high-resolution spectra obtained with the Isaac Newton Telescope (INT) on the Canary Islands. We find that, in Mrk 817, the narrow and broad emission lines (NELs and BELs, respectively) are very complex, indicating that structure of both the narrow and broad line region (NLR and BLR, respectively) is complex and consists of at least two subregions with different kinematical properties. We find that the BEL can be fitted with the two-component model, where the core of the line is coming from a spherical region with Isotropic velocity distribution, and wings might be affected by a low inclined accretion disc (or disc-like emitting region). Also, we discuss the physical properties of the BLR. Moreover, we find that an outflow is present in the NLR, which may be driven by an approaching jet. © 2006 RAS.