Physics of Active Galactic Nuclei, Softcover reprint of the original 1st ed. 1992 Proceedings of the International Conference, Heidelberg, 3–7 June 1991

The physical processes driving the different manifestations of the phe­ nomenon of active galactic nuclei have been studied extensively during the last decade. A major obstacle in all attempts to understand the relevant pro­ cesses has always been the wide range of frequencies over which significant fractions of the total power are emitted. During the last decade, orbiting telescopes and instrumental improvements for ground-based instrumenta­ tion provided the means for major advancements on the observational side. The organizers felt that it was timely to organize a meeting to discuss the impact of this new situation on the understanding of the relevant physical processes. More then 400 astrophysicists were interested in participating in the meeting, in spite of the constraints on overseas travel which were imposed in early 1991. Unfortunately only 220 participants could be hosted by the Max-Planck-Haus, the site of the 1991 Heidelberg conference. The meet­ ing was organized by Sonderforschungsbereich 328 "Evolution of Galaxies". During 5 sessions, most of which lasted for one day each, 47 invited and con­ tributed talks and 150 poster papers were given, most, but not all, of which are included in these proceedings. With a few exceptions the order of the written texts follows that of the oral contributions during the meeting. The arrangement of posters into the five sections was not always unambiguous. We hope to have placed them in the most appropriate sections, in which they are listed in alphabetical order.

The Black Hole Model of Active Galactic Nuclei.- 1 - High Energy Emitting Regions.- First Results from the ROSAT Survey (Review).- Evidence for X-ray Re-processing in Seyfert Galaxies (Review).- Iron Lines with Large Equivalent Width and X-Ray Reprocessing from a Thick Medium in Seyfert Galaxies.- EUV Observations of AGN.- Variable Soft X-Ray Excesses in AGN from Nonthermal Electron-Positron Pair Cascades.- A Model for the X-ray Variability of the Seyfert Galaxy NGC 6814.- Hard X-ray Observations of Active Galactic Nuclei with SIGMA.- Poster Contributions.- The X-ray Power Spectrum in the “Hot Spot” Model.- ROSAT All Sky Survey Observations of IRAS Galaxies.- Soft X-ray Spectra of Radio-loud Quasars: First Results from the ROSAT Survey.- EXOSAT X-ray Spectra of Quasars.- X-Ray Observations of Mkn 501 and Mkn 421 with ROSAT/XRT and Ginga.- The X-ray Variability of NGC 6814: A New Analysis of the EXOSAT Observations with Non-Linear Methods.- Are Radio Loud AGN ?-Ray Loud?.- X-ray Comptonized Spectra of Optically Thick Sources: Softening Versus Hardening as a Sign of Changed Geometry.- Constraints on Reflection in AGN.- X-Ray and FIR Emission from AGN and Normal Galaxies.- Line Profiles from Relativistic Disks at High Inclination Angles.- Response Function of the Iron K? Line from a Centrally Illuminated Accretion Disk.- Search for Longtimescale-Variability in AGN from the ROSAT All Sky Survey.- Recent Observations of PKS 2155–304 by GINGA.- Quasar X-Ray Spectra Revisited.- The ROSAT X-ray Spectrum of PG 1426+015.- 2 - Disks and Broad Line Regions.- Examining Alternatives to Accretion Disk Models for the AGN Continuum (Review).- Hybrid Accretion Disk Fits to the UV- to X-ray Spectra of AGN.- Continuum Variability in 3C 273.- Spherical and/or Disk Accretion in AGN (Review).- Structure and Spectra of Self-Gravitating Accretion Disks.- Search for Partial Lyman Edges in Nearby Quasars.- The Nature of the Broad-Line Clouds.- Broad Lines and Continuum Spectrum from Accretion Disc Models.- Variability and Its Implications for the Structure of the Broad Line Region (Review).- PosterContribution.- NGC 4151: A Test for the Stellar Origin of Variability in AGN.- A Study of Emission-line Variability of the Nucleus in the Seyfert Galaxy NGC 4151 in 1986–1989.- Self Gravitating Thick Accretion Disks.- First Results from the 500 – 7000 Å Monitoring Campaign of Markarian 509.- Preliminary Results on the Baldwin Effect and Correlation Between Disc Luminosity and Mass.- Dust Radiation in Active Galactic Nuclei.- Variability of the Broad Emission Line Profiles in NGC 5548.- Supernovae Produced BAL QSOs.- Magnetic Accretion Disks in AGN.- A QSO Classification Scheme.- UCM2257+2438: A New Seyfert Galaxy.- Magnetized Thin Accretion Disks in AGN.- On the Isotropy of the IR/Optical Emission in AGN.- Non-Linear Emission-Line Response and the Structure of the Broad-Line Region in NGC 5548.- Observations of AGN with Peculiar or Very Broad Emission Line Profiles: OQ 208.- LAG Optical Monitoring of QSO 1217+023.- Synthetic Photometry of AGN in the Range 50–200 Å.- Composite Models of the Broad Line Region.- Discrete Cloud Models of the Broad Line Region.- A Model for the Correlated Line and Continuum Variations in NGC 5548.- Stellar Winds as Broad Line Clouds.- Timescales of Phase Transitions in BLRs.- The Baldwin Effect and the Shape of the Ionizing Continuum.- A Thermal Model of the Continuum Variability of GQ Comae (PG 1202+281).- Optical Variability from a Thermally Unstable Region in AGN Accretion Disks.- Line Correlation Functions — An Indication of Nonlinear Response.- Gas Release Through Tidal Disruption of Stars.- Dust Emission from Extended AGN Disks.- The Viscous Evolution of Elliptical Disks.- Double-Peaked Broad-Line Profiles: Evidence for Accretion Disks with “Hot Spots”?.- Propagation of Light from Accretion Disks Around Kerr Black Holes.- Thermal Comptonization in AGN.- Rapid Variations in the BLR of NGC 3516.- AGN with Strong Si IV/OIV] 1400 Å Emission.- Kinematic Axisymmetry in QSOs.- Determining the Extinction, Luminosity and Flux Distribution of Seyfert Galaxies Using Broad-band Photometry.- 3 - Extended Narrow Line Regions and Host Galaxies.- Stellar Dynamics of Galactic Nuclei (Review).- Internal Dynamics of NGC 6240: Evidence for a Massive, Dark Compact Core?.- High Spatial Resolution NIR Imaging Spectroscopy.- Extended Emission-Line Regions as Probes of Nuclear Activity in Galaxies (Review).- HST Observations of Jets and AGN (Invited Contribution).- High Sensitivity Radio Observations of NGC 4151.- The Central Engine of Active Galactic Nuclei: Starbursts Versus Black Holes (Review).- A Cluster of He I Emission Line Stars in the Galactic Center.- Near-infrared Imaging of Hard X-ray Selected Active Galaxies.- Poster Contributions.- Models of Anisotropic Ionizing Radiation in Seyfert Galaxies.- Double and Extended Emission Line System in the Radio Galaxy 0114+074S.- Emission Line Maps of the Seyfert-2 Galaxies Mkn 3 and Mkn 78.- Forbidden High Ionization Lines in Quasars.- 4.7 µm Spectroscopy of NGC 1068.- Essential Properties of the cD Galaxy in Abell 1795.- ‘Composite’ Ionization Mechanisms in Active Galaxies.- Spatially Resolved, Kinematic Evidence of Mass Inflow to the Circumnuclear Region (< 100 pc) in NGC 1068.- Induced Star Formation in the Surroundings of AGN.- Optical Emission Associated with the Radio Jet in B2 1243+26.- High-Resolution Speckle Masking Observations of the Seyfert Galaxy NGC 1068.- Evidence for an Obscured BLR in the Early-Type Radio Galaxy IC5063.- Measuring the BL Lac Beam in Centaurus A.- Spectroscopy of the Nucleus in 3C 120.- Galaxy Clustering Around B2 Quasars.- High Resolution Spectroscopy of the Narrow Line Region of the Seyfert Galaxies NGC 7469 and NGC 1566.- IRAS Observations of UCM Galaxies.- A Study of Sérsic-Pastoriza Galaxies.- Quasar Jets and Off-Nuclear Emission-Line Gas.- High Latitude Excited Gas in the Seyfert 2 Galaxy NGC 3281.- Physical Conditions in the Extended Narrow Line Region of Mkn 573.- Gas and Dust in NGC 1275.- The Extended Narrow Line Region of NGC 4151: Spatial Variations of the Emission Line Ratios and Their Implications.- Mapping the 12CO J=2?l Emission from the Dust Lane in Centaurus A.- The Host Galaxies of Nearby QSOs.- High-Resolution Speckle Masking Observations of the Seyfert Galaxy NGC 1386.- 4 — Magnetic Fields and Jet Formation.- MHD Effects in AGN Accretion Disks (Review).- Hydromagnetic Disk Winds in AGN: The YSO Connection.- How Do Jets Establish Themselves?.- The Stability of Current-Carrying Jets.- Observations of Compact Active Galactic Nuclei — High Frequency VLBI and Intraday Variability (Review).- Radiative Acceleration of Blobs in AGN.- Emission Models for Compact Jets (Review).- The Spectra of Extended Radio Jets and Hot Spots (Review).- Poster Contributions.- Depolarization in Compact Radio Sources.- Diamagnetic Effects in Synchrotron Sources.- Non-linear Filaments Evolution in Radio Sources.- The Quasi-Periodicity and the Origin of Knots in Quasars.- The Microvariability of PKS 0735+178.- Limits on the Magnetic Field in the Compact Regions of Active Galactic Nuclei.- Pair Cascades in Ultrarelativistic Outflows from AGN.- Brightness Temperatures in Excess of 1012 K from Monoenergetic Electrons.- VLB I Observations of 5 Radio Galaxies.- Synchrotron Emission from Bent Shocked Relativistic Jets.- Collimation of Jets in a Kerr Magnetosphere.- Nonlinear Evolution of the Kelvin-Helmholtz Instability in 2-D Supersonic Slab Jets.- The Large-Scale Radio Structure of Centaurus A.- Physical Characteristics from Observations of Active Galactic Nuclei in a Jet Model.- The Sub-parsec Structure of AGN.- Variability Timescales of Quasars and BL Lac Objects.- Coherent Radiation and Intraday Variability: Magnetic Reconnection in AGN.- A Novel Mechanism for Nonthermal X-ray Emission.- The Optical Microvariability of 3C 371.- Jet Formation due to Accretion Disk Instability.- VLBI Observations of the Quasars 3C 345 and CTA102 at 18 cm Wavelength.- The Radio Jets of the S5-Quasar 1928+738.- A Very Simple Model to Explain the “Simultaneous” Variations at Optical and Radio Wavelengths as Observed in Some Blazars.- Photopolarimetric UBVRI Monitoring of 0J 287: New Questions to the Theoreticians.- Radiative Unstable Modes in Astrophysical Jets.- Radio- and Optical Variability in 0716+714.- Intraday Variability of Compact Radio Sources.- 5 - Unified Schemes and Evolution.- ‘Wide’ Jets and the X-ray and Radio Properties of BL Lac Objects (Invited Contribution).- Spectropolarimetry of Radio Galaxies as a Constraint on Orientation.- Unified Schemes of Radio Galaxies and Quasars (Review).- Unified Schemes for Radio-loud and Radio-quiet QSOs.- Luminosity Functions, Relativistic Beaming, and Unified Theories of AGN.- Quasar Surveys (Review).- Quasars and Galaxy Formation (Review).- The Environments of Quasars.- Posters Contributions.- Structural Evolution of High-Redshift Radio-Quasars.- Some Consequences of the Hypothesis on the Existence of Few QSO Generations.- Radio-optical Studies of the BQS.- Distant Radio Galaxies.- Polarization Properties and Unification Schemes.- Radio Variability of AGN: Shocks and Unified Models.- Starburst-Black Hole Models for AGN.- Variability as a Tool for Understanding Continuum Emission (Review).