Christopher W. Churchill – författare
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3 produkter
3 produkter
951 kr
Skickas inom 7-10 vardagar
'Quasar Absorption Lines' is a comprehensive, detailed exposition on the science and analysis of quasar spectra in two volumes, for both aspiring and seasoned astronomers. This Volume 1: 'Introduction, Discoveries, and Methods' covers the evolution of the field of quasar spectroscopy over the six decades since quasars were discovered, including the development and application of observational methods and the knowledge gained from them. The broad treatment includes studies of the Ly α forest, Lyman limit systems, damped Ly α absorbers, deuterium (D/H), 21-cm absorbers, HI and HeII reionization, the warm/hot intergalactic medium, and the multiple ionization phases of metal lines. The connections between these absorbers and galaxies (the circumgalactic medium), galaxy groups (the intragroup medium), and clusters of galaxies (the intracluster medium) are treated in depth. Also covered are the taxonomy and classifications of AGN/quasar spectra, black hole accretion, broad and narrow associated absorption lines, and the quasar circumgalactic medium.
951 kr
Skickas inom 7-10 vardagar
'Quasar Absorption Lines' is a comprehensive, detailed exposition on the science and analysis of quasar spectra in two volumes, for both aspiring and seasoned astronomers. This Volume 2: 'Astrophysics, Analysis, and Modeling' describes atomic transitions of hydrogenic and multi-electron ions, the theoretical foundation and practical application of the ΛCDM cosmological model, and radiative transfer from cosmological sources. The theory of spectrographs and the mathematical formalism and quantitative analysis of spectral absorption lines and ionization breaks are treated in detail, including column density measurements, line deblending, and Voigt profile fitting. The philosophies, methods, and techniques of large absorption line surveys are presented, including methods for correcting incompleteness and for measuring accurate absorber population statistics. Gas physics, heating/cooling, and ionization are also covered, followed by detailed methods for undertaking multi-component, multiphase chemical-ionization modeling.
2 557 kr
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This two-volume set gives a comprehensive, detailed exposition on the science and analysis of quasar spectra, for both aspiring and seasoned astronomers. Volume 1: 'Introduction, Discoveries, and Methods' introduces the historical development and application of quasar absorption line research, including hydrogen (HI, D/H, 21-cm), HeII, and metal lines from the full range of ions. The connection between absorbers and galaxies, groups, and clusters is treated in depth, as well as the taxonomy and classification of AGN/quasar spectra and their associated absorption lines. Volume 2: 'Astrophysics, Analysis, and Modeling' describes detailed theory and practical methods, including atomic physics of multi-electron ions, radiative transfer in the ΛCDM Universe, principles of spectrograph design, and quantitative analysis of absorption features. It presents the principles of large absorption line surveys for measuring absorber population statistics and the physics of partially ionized gas and multi-component, multiphase chemical-ionization modeling.