The emission spectrum of the strong Fe II emitter BAL Seyfert 1 galaxy IRAS 07598+6508

Abstract

The narrow-line Seyfert 1 galaxy IRAS 07598+6508 is known to be a stong Fe II emitter. The analysis of several high S/N ratio spectra shows that its spectrum is dominated by a relatively narrow "broad line" region (1 780 km s${}^{-1}$ FWHM) emitting not only Fe II, but also Ti II and Cr II lines. Although we were unable to find a completely satisfactory physical model, we got the best agreement with the observations with collisional rather than radiative models, with a high density (n=10${}^{15}$ cm${}^{-3}$), a high column density (N${}_H$=10${}^{25}$ cm${}^{-2}$) and a microturbulence of 100 km s${}^{-1}$. This BLR is qualitatively similar to the one observed in I Zw 1. We have not found traces in IRAS 07598+6508 of the narrow line regions found in I Zw 1.

15 pages, 4 figures, accepted by A&A

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