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
- IV X-rays and Accretion Disks
- X-ray Variability in AGN
- Thermal Reprocessing of X-rays in NGC 5548
- New Ginga Observation and Model of NGC 6814 Periodicity
- Power Spectrum Fits to EXOSAT Long Looks
- Dramatic X-ray Spectral Variability of Mkn 841
- Thermal and Non-Thermal Emission from Accretion Disks
- Ultra-Soft X-ray Emission in AGN
- Highly Ionized Gas in Seyfert Galaxies
- EUV Observations of Seyfert 1 Galaxies and Quasars
- 0.1–;20 keV Spectra of 3C 273 and E1821+643
- Iron Lines from Ionized Discs
- Reflection Effects in Realistic Discs
- X-Ray Polarization Properties in the Two-Phase Model for AGN
- X-Ray Reprocessing and UV Continuum in NGC 4151
- Dense Clouds Near the Center of Active Galactic Nuclei
- Accretion Discs in AGN Context: Hints Toward Non-Standard Discs?
- Accretion Disk Instabilities
- Compton-Heated Winds from Accretion Disks
- Determination of a Transonic Solution in a Stationary Accretion Disc
- Black Holes and Accretion Disks
- Testing the “Disc X-ray Reprocessing” in UV-Optical Continuum and Line Emission in NGC 5548
- Accretion Discs in Realistic Potentials
- Test of the Accretion Disc Model and Orientation Indicator
- Orientation Effects in QSO Spectra
- The Luminosity-Colour Distribution of Quasar Accretion Disks
- V Beams, Jets and Blazars
- VI Concluding Talk
The Luminosity-Colour Distribution of Quasar Accretion Disks
from IV - X-rays and Accretion Disks
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
- IV X-rays and Accretion Disks
- X-ray Variability in AGN
- Thermal Reprocessing of X-rays in NGC 5548
- New Ginga Observation and Model of NGC 6814 Periodicity
- Power Spectrum Fits to EXOSAT Long Looks
- Dramatic X-ray Spectral Variability of Mkn 841
- Thermal and Non-Thermal Emission from Accretion Disks
- Ultra-Soft X-ray Emission in AGN
- Highly Ionized Gas in Seyfert Galaxies
- EUV Observations of Seyfert 1 Galaxies and Quasars
- 0.1–;20 keV Spectra of 3C 273 and E1821+643
- Iron Lines from Ionized Discs
- Reflection Effects in Realistic Discs
- X-Ray Polarization Properties in the Two-Phase Model for AGN
- X-Ray Reprocessing and UV Continuum in NGC 4151
- Dense Clouds Near the Center of Active Galactic Nuclei
- Accretion Discs in AGN Context: Hints Toward Non-Standard Discs?
- Accretion Disk Instabilities
- Compton-Heated Winds from Accretion Disks
- Determination of a Transonic Solution in a Stationary Accretion Disc
- Black Holes and Accretion Disks
- Testing the “Disc X-ray Reprocessing” in UV-Optical Continuum and Line Emission in NGC 5548
- Accretion Discs in Realistic Potentials
- Test of the Accretion Disc Model and Orientation Indicator
- Orientation Effects in QSO Spectra
- The Luminosity-Colour Distribution of Quasar Accretion Disks
- V Beams, Jets and Blazars
- VI Concluding Talk
Summary
Abstract
Much effort has gone into analysing the now well-known luminosity evolution of the quasar population. Theoretical models, such as the accretion disk model, however, predict a spectral evolution which is more complicated than a simple overall luminosity shift [3], and more detailed spectral information is necessary to compare physical models with the data. We investigate the distribution and evolution of quasars on the color-flux plane in order to test for consistency with the thin accretion disk model.
Introduction
Much effort has gone into analysing the now well-known luminosity evolution of the quasar population. Theoretical models, such as the accretion disk model, however, predict a spectral evolution which is more complicated than a simple overall luminosity shift [3], and more detailed spectral information is necessary to compare physical models with the data. We investigate the distribution and evolution of quasars on the colour-flux plane in order to test for consistency with the thin accretion disk model.
Quasar Colours
It has been known since the first quasar surveys that active galactic nuclei (AGN) occupy a specific region of the two colour diagram, separate from most other galactic and extragalactic sources. Consequently, UBV photometry has been used to select AGN in numerous surveys up to a redshift z ∼ 2.2 where the Lα emission line and absorption edge are redshifted into the observed bands.
- 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. 356 - 358Publisher: Cambridge University PressPrint publication year: 1994