1998/08/18 by F. Nicastro, Nicastro, F., F. Fiore +3
Medicine · Physics and Astronomy · #Astrophysics (astro-ph) #Cardiac Imaging and Diagnostics #FOS: Physical sciences #Medical Imaging Techniques and Applications #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9808183
7 pages, 3 figures, to appear in the "Vulcano Workshop 1998: Frontier Objects in Astrophysics and Particle Physics", the special series of Conference Proceedings published by the "Societa' Italiana di Fisica", F. Giovannelli and G. Mannocchi (eds.)
arxiv created 1998/08/18 · openalex publication_date 1998/08/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present photoionization models accounting for both photoelectric and resonant absorption. We demonstrate that resonance absorption lines are detectable even in moderate resolution X-ray spectra of type 1 AGN. The spectra transmitted by gas illuminated by the ionizing continua typical of flat X-ray spectrum, broad optical emission line type 1 AGN, and steep X-ray spectrum, narrow optical emission line type 1 AGN (NLSy1) are dramatically different. In particolar, we find that both the absorption features seen in many Seyfert 1 galaxies between 0.7 and 1 keV and in several NLSy1 between 1 and 2 keV can be explained by our model, without requiring relativistic outflowing velocities of the gas.