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29 March 2024
 
  » arxiv » astro-ph/9812392

 Article overview


Resonant Absorption in the AGN spectra emerging from photoionized gas: differences between steep and flat ionizing continua
Fabrizio Nicastro ; Fabrizio Fiore ; Giorgio Matt ( Harvard-Smithsonian Center for Astrophysics ; Cambridge ; US ; Osservatorio Astronomico di Monteporzio ; Monteporzio Catone ;
Date 21 Dec 1998
Subject astro-ph
Affiliation1, 2 and 3), Fabrizio Fiore (1 and 2), Giorgio Matt ( Harvard-Smithsonian Center for Astrophysics, Cambridge, US, Osservatorio Astronomico di Monteporzio, Monteporzio Catone (RM), Italy, Istituto di Astrofisica Spaziale - CNR, Roma, Italy Universit
AbstractWe present photoionization models accounting for both photoelectric and resonant absorption. Resonance absorption lines from C, O, Ne, Mg, Si S and Fe between 0.1 and 10 keV are treated. In particular we consider the complex of almost 60 strong Fe L absorption lines around 1 keV. We calculate profiles, intensities and equivalent widths of each line, considering both Doppler and natural broadening mechanisms. Doppler broadening includes a term accounting for turbulence of the gas along the line of sight. We computed spectra transmitted by gas illuminated by drastically different ionizing continua and compared them to spectra observed in flat X-ray spectrum, broad optical emission line type 1 AGN, and steep X-ray spectrum, narrow optical emission line type 1 AGN. We show that the $sim 1$ keV absorption feature observed in moderate resolution X-ray spectra of several Narrow Line Seyfert 1 galaxies can be explained by photoionization models, taking into account for resonance absorption, without requiring relativistic outflowing velocities of the gas, if the physical properties of these absorbers are close to those found in flat X-ray spectrum Seyfert 1 galaxies.
Source arXiv, astro-ph/9812392
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