Book contents
- Frontmatter
- Contents
- Index of Participants
- Preface
- I Evidence and Implications of Anisotropy in AGN
- II Luminosity Functions and Continuum Energy Distributions
- III The Broad Line Region: Variability and Structure
- Emission Line and Continuum Variability in Active Galactic Nuclei
- Results of the LAG Monitoring Campaign
- A Relation Between the Profiles and Intensities of Broad Emission Lines
- Broad Line Profile Variability in NGC 4593
- Deconvolution of Variable Seyfert 1 Profiles
- Ultra-violet Variability of AGN
- Broad-Line Variations in NGC 5548
- NGC 4593: A Low Luminosity Compact Seyfert 1 Nucleus
- UV Continuum Origin and BLR Structure in F-9
- UV Emission Line Intensities and Variability: a Self Consistent Model for Broad-Line Emitting Gas in NGC 3783
- Non-Linear Anisotropic BLR Models
- Anisotropic Line Emission from Extended BLR's
- Active Galactic Nuclei and Nuclear Starbursts
- Rapidly Evolving Compact SNRs and the Nature of the Lag in AGNs
- Supernova Explosions in QSOs? - II
- High Metallicities in QSOs
- The Chemical Evolution of QSOs
- Non-Linearity of Ly α Response in Variable AGNs
- Implications of Broad Line Profile Diversity among AGN
- Emission Line Studies of AGN
- A Search for Velocity Shifts in QSO Broad Lines
- Broad Line Region Structure from Profile Shapes
- IV X-rays and Accretion Disks
- V Beams, Jets and Blazars
- VI Concluding Talk
Emission Line Studies of AGN
from III - The Broad Line Region: Variability and Structure
Published online by Cambridge University Press: 04 August 2010
- Frontmatter
- Contents
- Index of Participants
- Preface
- I Evidence and Implications of Anisotropy in AGN
- II Luminosity Functions and Continuum Energy Distributions
- III The Broad Line Region: Variability and Structure
- Emission Line and Continuum Variability in Active Galactic Nuclei
- Results of the LAG Monitoring Campaign
- A Relation Between the Profiles and Intensities of Broad Emission Lines
- Broad Line Profile Variability in NGC 4593
- Deconvolution of Variable Seyfert 1 Profiles
- Ultra-violet Variability of AGN
- Broad-Line Variations in NGC 5548
- NGC 4593: A Low Luminosity Compact Seyfert 1 Nucleus
- UV Continuum Origin and BLR Structure in F-9
- UV Emission Line Intensities and Variability: a Self Consistent Model for Broad-Line Emitting Gas in NGC 3783
- Non-Linear Anisotropic BLR Models
- Anisotropic Line Emission from Extended BLR's
- Active Galactic Nuclei and Nuclear Starbursts
- Rapidly Evolving Compact SNRs and the Nature of the Lag in AGNs
- Supernova Explosions in QSOs? - II
- High Metallicities in QSOs
- The Chemical Evolution of QSOs
- Non-Linearity of Ly α Response in Variable AGNs
- Implications of Broad Line Profile Diversity among AGN
- Emission Line Studies of AGN
- A Search for Velocity Shifts in QSO Broad Lines
- Broad Line Region Structure from Profile Shapes
- IV X-rays and Accretion Disks
- V Beams, Jets and Blazars
- VI Concluding Talk
Summary
Abstract
The Hubble Space Telescope (HST) has been producing data from regularly scheduled observations for some time now. At this juncture, it is an appropriate time to review some of the areas where instruments such as the Faint Object Spectrograph (FOS), when coupled with ground-based data, may improve studies of Active Galactic Nuclei (AGN) and, hopefully, stir the imaginations of the theorists! We show examples of objects where the data indicate that the emission line properties of high- and low-luminosity objects are similar, lending support to relatively simple models in which the emission line regions of AGN scale homologously. We note, however, that the definition of what the ‘normal’ properties of AGN are rather than individual peculiarities will have to await complete samples of objects with data covering as large a wavelength range as possible.
Line Ratios.
It has become feasible in recent years to study the Balmer lines of high redshift QSOs in some detail and to determine velocity-resolved ratios such as those of Lyα/Hα – see, for example,. Even more recently, it has become possible to regularly obtain UV data with the HST and to perform more detailed analysis than was possible using IUE spectra. As an example, in Figure 1 we show a comparison between the Lyα/Hα line ratios in two radio-loud objects of similar linewidth and velocity shifts.
The 3C273 data are from [4] and the PKS 1448 – 232 are taken from [2].
- Type
- Chapter
- Information
- The Nature of Compact Objects in Active Galactic NucleiProceedings of the 33rd Herstmonceux Conference, held in Cambridge, July 6-22, 1992, pp. 244 - 247Publisher: Cambridge University PressPrint publication year: 1994