Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26q.207r&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
Scientific paper
All the complexity of the Fe II spectrum is reflected in active galactic nuclei (AGN), where the emission of several multiplets form a pseudo-continuum that extends from the UV to the near-infrared (NIR) regions (Wills, Netzer & Wills 1985, Vestergaard & Wilkes 2001, Rodríguez-Ardila et al. 2002). Tackled phenomenologically since the 70's, these lines can now be investigated in order to get information about the physical conditions of the broad line region (BLR) in AGNs using the most recent theoretical templates by Sigut & Pradhan (2004). These models include details of the Fe II ion microphysics and cover a wide range of ionization parameter (log= -3.0-1.3) and density (log N_H= 9.6-12.6 cm^{-3}). With the aid of such templates and spectral synthesis approach, we study the Fe II emission in I Zw 1 and other narrow-line Seyfert 1 galaxies. The primary goal is to determine the relative contributions of collisional excitation and Ly α fluorescence. These two excitation mechanisms have been pointed out as the most important ones responsible for the formation of the observed Fe II spectrum. We also investigate the excitation channels that lead to populate the upper energy levels responsible for most of optical Fe II emission. Our results show that Ly α fluorescence is a key process to understand the Fe II spectrum both in the NIR and optical regions of AGN. This is further supported by the strong correlation found between optical and NIR Fe II line intensities. Clues for the most likely location of the iron emitting gas is obtained from the analysis of the BLR line profiles.
Garcia-Rissmann Aurea
Pradhan Anirudh
Rodriguez-Ardila Alberto
Sigut Aaron
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