ENGLISH

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

By Tek Prasad Adhikari

Book information

Publisher
Springer International Publishing
Year
2019
ISBN
978-3-030-22736-4, 978-3-030-22737-1
Language
english
Format
PDF
Filesize
7 MB (7198855 bytes)
Series
Springer Theses
Edition
1st ed. 2019
Pages
XIX, 126\139
Time added
2020-02-08 04:41:18
Physics; Astrophysics and Astroparticles

Description

This book presents timely work on the nature of the physical processes underpinning two of the basic characteristics of the gas structure in the innermost region of Active Galactic Nuclei (AGN): ionized outflows and emission line regions. In addition, it describes physics-based methods for estimating the density of the astrophysical plasma surrounding AGN. All numerical computations of the photoionized gas employ the most advanced codes available (CLOUDY and TITAN). Calculations of the radiative transfer are based on the assumption of thermal and ionization equilibrium. Promising preliminary examples of comparison with current observations are included for several individual AGN. All of them suggest that the absorbing/emitting gas should have a density on the order of 1012 cm-3. Future observations will provide more objects to verify these results, and will allow us to put constraints on the launch radius of ionized outflows and therefore on the mass loading and kinetic energy outflow rates. These rates, in turn, are crucial to estimating whether the outflows have a significant feedback impact on star formation and metal enrichment in the interstellar medium of the host galaxy. In closing, the book discusses a representative example of applying powerful photoionization techniques to explain the complex physics of the AGN environment. Front Matter ....Pages i-xix Introduction (Tek Prasad Adhikari)....Pages 1-13 Photoionization Simulations of AGN Environment (Tek Prasad Adhikari)....Pages 15-33 The Role of Gas Density (Tek Prasad Adhikari)....Pages 35-53 Absorption Measure Distribution (AMD) in AGNs (Tek Prasad Adhikari)....Pages 55-81 Intermediate Line Region in AGNs (Tek Prasad Adhikari)....Pages 83-121 Summary and Future Studies (Tek Prasad Adhikari)....Pages 123-126

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