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Photoionization Modelling as a Density Diagnostic of Line Emitting/Absorbing Regions in Active Galactic Nuclei

Part of the book series: Springer Theses ((Springer Theses))

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Abstract

The best way to study the supermassive black holes (SMBHs) is to investigate the matter in the AGN environment. The radiation, emitted as a result of the accretion, interacts with and ionizes the surrounding materials, the spectral signatures of which can be seen in the observed optical/UV/X-ray spectra of AGNs. With the advent of observational techniques from radio to the hard X-ray bands, the electromagnetic properties of AGNs have been known in much details over the period of a few decades. One of the most important achievements from multi-wavelength observations of AGNs is the identification of various components: the accretion disk (AD) surrounding the SMBH, the emission regions where the broad and narrow lines originate, the absorption regions, the collimated and dispersed outflows,the dusty torus, and the hot corona where hard X-ray emission comes from. This thesis deals with the two major components; the absorption regions and the emission regions. A brief overview of the AGN properties and a short review of the relevant literature is given in this Chapter.

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Authors and Affiliations

  1. Nicolaus Copernicus Astronomical Center Polish Academy of Sciences (NCAC PAS), Warsaw, Poland

    Dr. Tek Prasad Adhikari

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  1. Dr. Tek Prasad Adhikari
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Correspondence to Tek Prasad Adhikari .

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Adhikari, T.P. (2019). Introduction. In: Photoionization Modelling as a Density Diagnostic of Line Emitting/Absorbing Regions in Active Galactic Nuclei. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-030-22737-1_1

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