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15 : ACTIVE GALACTIC NUCLEI
     Questions     Refs.   
(1) Introduction
      (a) Operational Definition of AGN
      (b) Reasons for Studying AGN
(2) Brief Historical Sketch
      (a) Early Optical Spectroscopy
      (b) Early Radio Observations
      (c) Quasar Discovery
      (d) The Redshift Controversy
(3) The AGN Paradigm
(4) AGN Taxonomy
      (a) Four Basic Criteria
      (b) Taxonomic Table
      (c) Mixed Classifications
      (d) Emission Line Classification
(5) AGN Detection and Identification
      (a) Radio Surveys
      (b) Optical Colors
            (i)   Single Color
            (ii)  Multi-color
      (c) Slitless Spectroscopy
            (i)   Markarian Survey
            (ii)  Other Slitless Surveys
      (d) Emission Lines
      (e) Infra-Red
      (f) X-ray & Gamma-ray
      (g) Variability & Proper Motion
(6) AGN Demographics
      (a) Frequency of AGN in the Local Galaxy Population
      (b) AGN Preference for Big Bulges
      (c) Higher Luminosities
(7) AGN Unified Schemes
      (a) Two Different Angle-Dependent Phenomena
            (i)   Angle Dependent Obscuration
            (ii)  Doppler Boosting of a Relativistic Jet
      (b) Seyfert 2s / Seyfert 1s
            (i)   NLR/ENLR Shapes
            (ii)  NLR vs Nuclear Luminosity Comparison
            (iii) Q(nuc) from NLR Radiation Paramater
            (iv) Periscopic (Polarazation) View of the Nucleus
            (v)  Nuclear Absorption: X-ray Spectra
            (vi) Nuclear Absorption: Molecular Masers
            (vii) Opening Angle
            (viii) Do All Seyfert 2s have Seyfert 1 Nuclei?
      (c) NLRGs / BLRGs
      (d) Radio Loud: PRG-II / LD-QSR / CD-QSR
      (e) RG-I / BL-Lacs : straight down the beam
      (f) Intrinsic Differences: Luminosity & Radio Loudness
(8) Accretion Power
      (a) The Eddington Luminosity & Growth Rate
      (b) Thin Accretion Disks
      (c) Accretion Efficiency: The Inner Radius
            (i)   Newtonian Point Mass Potential
            (ii)  Schwarzschild (Non-Rotating) Potential
            (iii) Rotating Black Holes
      (d) Feeding the Disk
            (i) Nuclear ISM
            (ii)  Tidally Disrupted Stars
      (e) Extracting Rotational Energy?
      (f) Inevitability of Black Hole Formation
(9) Continuum SEDs
(10) Emission Line and Ionized Cloud Physics
      (a) Simple Density Limits for the NLR and BLR
      (b) Properties of Gas at Single n_e and Te
      (c) The Structure of Ionized Clouds
      (d) The Radiation Parameter
      (e) Calculating Simple Region Properties
            (i)   Mass of Ionized Gas
            (ii)  Region Size
            (iii) Filling Factor for Ionized Gas
            (iv) Cloud Size
            (v)  Cloud Numbers
(11) The Broad Line Region
(12) The Narrow Line Region
(13) Intrinsic Absorption Lines
(14) AGN Radio Properties : Cores, Jets, Lobes
(15) AGN Host Galaxies and Environment
(16) AGN Evolution