(Note: the title actually, but erroneously, shown on the dust jacket, cover, and title page is Multi-Wavelength Continuum Emission of AGN, which is really only the heading of the first section of the volume. Because the correct, but omitted, title subsumes the erroneous title, Book News uses it in order to most accurately establish the reach of the volume.) The proceedings, then, of IAU Symposium No. 159, held in Geneva, Switzerland, August-September 1993, contain almost all of the presentations given at the conference both as posters and as oral invited and contributed papers. They address topics in multi- wavelength continuum emission of AGN; new observations of AGN with specific instruments; variability; correlations between emission components; AGN physics and models; unified schemes and relations with other types of objects; continuum studies; emission processes; x-rays and higher energies; variability; radio emission (maps); line studies; disk structure and emission; and statistical studies and evolution. Annotation copyright by Book News, Inc., Portland, OR

Active Galactic Nuclei radiate over the electro-magnetic spectrum from radio waves to gamma rays. Understanding the physics of these objects therefore requires the synthesis of results from many different domains of Astronomy. It was the aim of the conference "Active Galactic Nuclei across the Electromagnetic Spectrum" to provide a forum where this exchange could take place. Some 300 astronomers participated to the conference, 250 of them presented results either as oral papers or in the form of posters. Observations in all domains of the electro magnetic spectrum in which astronomical observations can be made from the ground or from space were presented. Many theoretical contributions were also given. There has been a tremendous growth in the number and quality of Astronomical obser vations in many spectral domains over the past several years. Students of Active Galactic Nuclei have been particularly keen to make use of the available facilities (both space born and on the ground), often in a very organised way, in order to obtain repeated simultane ous data covering large bands of the spectrum. This approach has produced a qualitatively new set of data for understanding the physics of Active Galactic Nuclei. The task of the meeting was to review this data in a coherent way.

The huge amount of data obtained by surveys in all wavebands, from radio to X-rays, has allowed major progress in the understanding of Active Galactic Nuclei and of their cosmic evolution. This book contains the proceedings of a conference intended to give a broad overview of the recent results obtained by recent AGN surveys over the whole electromagnetic spectrum. Topics which were discussed during the conference and are included in this volume are: AGN evolution, contribution to the cosmic background, AGN luminosity functions in different wavebands, multiwavelength properties of AGN, unified model and unconventional AGN, connection with the host galaxies, co-evolution of AGN and galaxies, implications for the local density of supermassive black holes. Future AGN surveys planned with forthcoming new observational facilities are also included.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings® (ISTP® / ISI Proceedings)• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)• CC Proceedings — Engineering & Physical Sciences

At UV/optical wavelengths, the luminosity of Active Galactic Nuclei (AGNs) varies stochastically on timescales ranging from hours to years. This stochastic variability originates from AGN's accretion disk and provides unique information about its inner workings. It has recently been shown that AGN UV/optical variability exhibits different characteristics at short and long timescales. This dissertation utilizes the approach of directly modeling AGN UV/optical light curves as a noise-driven damped harmonic oscillator (DHO) process. This approach enables us to connect short and long-term variability and probe the accretion flows in AGNs. The DHO process is a second-order continuous-time autoregressive moving-average process---a statistical model commonly used to forecast the stock market. We carry out two investigations in this study: 1) we apply the DHO model to 9́8 12,000 AGNs with 8-years-long ugriz light curves collected from the Sloan Digital Sky Survey (SDSS); 2) we repeat the process for 9́8 24,000 AGNs with combined gri light curves from SDSS and the PanSTARRS1 (PS1) survey. The distributions of DHO fits obtained in these two investigations are broadly consistent, demonstrating that AGNs occupy a unique part of the DHO parameter space. We find that: 1) the best-fit DHO parameters correlate with the probed rest-frame wavelength ([lambda] RF ) and the fundamental properties of our modeled AGNs; 2) the modeled long-term variability at [lambda] RF > 2800A might be contaminated by the Balmer diffuse continuum external to the accretion disk; 3) the long-term characteristic variability timescale extracted by the DHO exhibits a wavelength dependence that is closest to the theoretical prediction when compared to similar timescales extracted using other methods. We demonstrate that the DHO process is a viable choice for directly modeling AGN's UV/optical variability. The upcoming all-sky time-domain survey, Rubin Observatory's Legacy Survey of Space and Time (LSST), will benefit from this approach, given LSST's superior light curves.

The huge amount of data obtained by surveys in all wavebands, from radio to X-rays, has allowed major progress in the understanding of Active Galactic Nuclei and of their cosmic evolution. This book contains the proceedings of a conference intended to give a broad overview of the recent results obtained by recent AGN surveys over the whole electromagnetic spectrum. Topics which were discussed during the conference and are included in this volume are: AGN evolution, contribution to the cosmic background, AGN luminosity functions in different wavebands, multiwavelength properties of AGN, unified model and unconventional AGN, connection with the host galaxies, co-evolution of AGN and galaxies, implications for the local density of supermassive black holes. Future AGN surveys planned with forthcoming new observational facilities are also included.The proceedings have been selected for coverage in: ? Index to Scientific & Technical Proceedings? (ISTP? / ISI Proceedings)? Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)? CC Proceedings ? Engineering & Physical Sciences