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Author: Cameron Lawlor-Forsyth Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Investigating the environments of galaxies and active galactic nuclei (AGN) is crucial to understanding the formation and evolution of AGN and the host galaxies in which they reside. The environments of galaxies can inform star formation and morphology. The environments of AGN can inform possible accretion scenarios and therefore activity, as well as feedback. Similar environments are expected for the various flavours of AGN as guided by AGN unification. As well, if active galaxies reside in the same environments as passive galaxies, this supports normal galaxies experiencing relatively short periods of activity throughout their lifetimes. We have characterized the environments of a sample of nearby Type I AGN as well as the environments of other active and passive galaxies in the same redshift range. We find a strong similarity between the environments of the reference sample with the comparison AGN and normal galaxies. These results support AGN unification and AGN/galaxy unification where normal galaxies have active periods. We then investigate the environmental dependence for some AGN and host galaxy properties. We find no strong dependence for any parameter over both small scale environment and larger scale environment. This suggests that galaxy and AGN evolution is not sensitive to environment, but is driven by processes within the host galaxy for our sample of optically selected nearby Type I AGN.
Author: Cameron Lawlor-Forsyth Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Investigating the environments of galaxies and active galactic nuclei (AGN) is crucial to understanding the formation and evolution of AGN and the host galaxies in which they reside. The environments of galaxies can inform star formation and morphology. The environments of AGN can inform possible accretion scenarios and therefore activity, as well as feedback. Similar environments are expected for the various flavours of AGN as guided by AGN unification. As well, if active galaxies reside in the same environments as passive galaxies, this supports normal galaxies experiencing relatively short periods of activity throughout their lifetimes. We have characterized the environments of a sample of nearby Type I AGN as well as the environments of other active and passive galaxies in the same redshift range. We find a strong similarity between the environments of the reference sample with the comparison AGN and normal galaxies. These results support AGN unification and AGN/galaxy unification where normal galaxies have active periods. We then investigate the environmental dependence for some AGN and host galaxy properties. We find no strong dependence for any parameter over both small scale environment and larger scale environment. This suggests that galaxy and AGN evolution is not sensitive to environment, but is driven by processes within the host galaxy for our sample of optically selected nearby Type I AGN.
Author: Volker Beckmann Publisher: John Wiley & Sons ISBN: 352766680X Category : Science Languages : en Pages : 390
Book Description
Active Galactic Nuclei This AGN textbook gives an overview on the current knowledge of the Active Galacitc Nuclei phenomenon. The spectral energy distribution will be discussed, pointing out what can be observed in different wavebands. The different physical models are presented together with formula important for the understanding of AGN physics. Furthermore, the authors discuss the AGN with respect to its environment, host galaxy, feedback in galaxies and in clusters of galaxies, variability, etc. and finally the cosmological evolution of the AGN phenomenon. This book includes phenomena based on new results in the X-Ray and gamma-ray domain from new telescopes such as Chandra, XMM-Newton, the Fermi Gamma-Ray Space Telescope, and the VHE regime not mentioned so far in AGN books. Those and other new developments as well as simulations of AGN merging events and formations, enabled through latest super-computing capabilities. From the contents: The observational picture of AGN Radiative processes The central engine AGN types and unification AGN through the electromagnetic spectrum AGN variability Environment Quasars and cosmology Formation, evolution and the ultimate fate of AGN What we do not know (yet)
Author: Bradley M. Peterson Publisher: Cambridge University Press ISBN: 9780521479110 Category : Science Languages : en Pages : 258
Book Description
How can we test if a supermassive black hole lies at the heart of every active galactic nucleus? What are LINERS, BL Lacs, N galaxies, broad-line radio galaxies and radio-quiet quasars and how do they compare? This timely textbook answers these questions in a clear, comprehensive and self-contained introduction to active galactic nuclei - for graduate students in astronomy and physics. The study of AGN is one of the most dynamic areas of contemporary astronomy, involving one fifth of all research astronomers. This textbook provides a systematic review of the observed properties of AGN across the entire electromagnetic spectrum, examines the underlying physics, and shows how the brightest AGN, quasars, can be used to probe the farthest reaches of the Universe. This book serves as both an entry point to the research literature and as a valuable reference for researchers in the field.
Author: Julian H. Krolik Publisher: Princeton University Press ISBN: 0691011516 Category : Science Languages : en Pages : 628
Book Description
This is the first comprehensive treatment of active galactic nuclei--the cosmic powerhouses at the core of many distant galaxies. The term active galactic nuclei refers to quasars, radio galaxies, Seyfert galaxies, blazars, and related objects, all of which are believed to share a similar central engine--a supermassive black hole many times the mass of the Sun. Astrophysicists have studied these phenomena for the past several decades and have begun to develop a consensus about many of their properties and internal mechanisms. Julian Krolik, one of the world's leading authorities on the subject, sums up leading ideas from across the entire range of research, making this book an invaluable resource for astronomers, physicists interested in applications of the theory of gravitation, and graduate students. Krolik begins by addressing basic questions about active galactic nuclei: What are they? How can they be found? How do they evolve? He assesses the evidence for massive black holes and considers how they generate power by accretion. He discusses X-ray and g-ray emission, radio emission and jets, emission and absorption lines, anisotropic appearance, and the relationship between an active nucleus and its host galaxy. He explores the mysteries of what ignites, fuels, and extinguishes active galactic nuclei, and concludes with a general review of where the field now stands. The book is unique in paying careful attention to relevant physics as well as astronomy, reflecting in part the importance of general relativity to understanding active galactic nuclei. Clear, authoritative, and detailed, this is crucial reading for anyone interested in one of the most dynamic areas of astrophysics today.
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781722884970 Category : Languages : en Pages : 30
Book Description
We are continuing our systematic investigation of the nuclear structure of nearby active galactic nuclei (AGN). Upon completion, our study will characterize hypothetical constructs such as narrow-line clouds, obscuring tori, nuclear gas disks. and central black holes with physical measurements for a complete sample of nearby AGN. The major scientific goals of our program are: (1) the morphology of the NLR; (2) the physical conditions and dynamics of individual clouds in the NLR; (3) the structure and physical conditions of the warm reflecting gas; (4) the structure of the obscuring torus; (5) the population and morphology of nuclear disks/tori in AGN; (6) the physical conditions in nuclear disks; and (7) the masses of central black holes in AGN. We will use the Hubble Space Telescope (HST) to obtain high-resolution images and spatially resolved spectra. Far-UV spectroscopy of emission and absorption in the nuclear regions using HST/FOS and the Hopkins Ultraviolet Telescope (HUT) will help establish physical conditions in the absorbing and emitting gas. By correlating the dynamics and physical conditions of the gas with the morphology revealed through our imaging program, we will be able to examine mechanisms for fueling the central engine and transporting angular momentum. The kinematics of the nuclear gas disks may enable us to measure the mass of the central black hole. Contemporaneous X-ray observations using ASCA will further constrain the ionization structure of any absorbing material. Monitoring of variability in the UV and X-ray absorption will be used to determine the location of the absorbing gas, possibly in the outflowing warm reflecting gas, or the broad-line region, or the atmosphere of the obscuring torus. Supporting ground-based observations in the optical, near-IR, imaging polarimetry, and the radio will complete our picture of the nuclear structures. With a comprehensive survey of these characteristics in a complete sample of nearby AGN, our conclus...
Author: Cameron Lawlor-Forsyth
Author: Cameron Lawlor-Forsyth
Author: Volker Beckmann
Author: Bradley M. Peterson
Author: Julian H. Krolik
Author: Petra Nass
Author: National Aeronautics and Space Administration (NASA)
Author: Geoffrey Leonard Taylor
Author: Hagai Netzer
Author: John Edward Dyson
Author: T. Courvoisier