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Quasars Classes and Their Relationships

  • Mauro D’Onofrio
  • Paola Marziani
  • Jack W. Sulentic
  • Deborah Dultzin
  • Yuri Efimov
  • Martin Gaskell
  • Marianne Vestergaard
  • Damien Hutsemékers
  • Alberto Franceschini
  • Ari Laor
  • Dirk Grupe
  • Sebastian Lipari
  • Begoña Garcıa Lorenzo
  • Evencio Mediavilla
  • Todd Boroson
  • Mike Eracleous
  • Isabel Marquez-Perez
  • Elmar Körding
  • Heino Falcke
Chapter
Part of the Astrophysics and Space Science Library book series (ASSL, volume 386)

Abstract

Most of the questions in this chapter deal with sources that do not show the “classical” broad emission-line spectrum that characterizes the majority of known AGNs at high and low redshift. If that majority represents a “parent population” of AGNs, is the apparent absence of broad lines a result of obscuration, orientation, or different physical conditions? Can all of the subclasses be unified under the AGN umbrella? With the unification scheme set in place and assumed to be fundamentally correct, there are at least four overarching questions: do all type-2 AGNs possess an obscured broad-line region? Or how can we distinguishing type-2 AGNs without a broad-line region if they exist? Where is the low end of quasar activity? The least luminous AGNs are the so-called low-ionization nuclear emission-line regions (LINERs), but it is legitimate to ask if they are all true AGNs.

Keywords

Black Hole Accretion Disk Accretion Rate Radio Galaxy Host Galaxy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Mauro D’Onofrio
    • 1
  • Paola Marziani
    • 2
  • Jack W. Sulentic
    • 3
  • Deborah Dultzin
    • 4
  • Yuri Efimov
    • 5
  • Martin Gaskell
    • 6
  • Marianne Vestergaard
    • 7
    • 8
  • Damien Hutsemékers
    • 9
  • Alberto Franceschini
    • 1
  • Ari Laor
    • 10
  • Dirk Grupe
    • 11
  • Sebastian Lipari
    • 12
  • Begoña Garcıa Lorenzo
    • 13
  • Evencio Mediavilla
    • 13
  • Todd Boroson
    • 14
  • Mike Eracleous
    • 15
  • Isabel Marquez-Perez
    • 3
  • Elmar Körding
    • 16
  • Heino Falcke
    • 16
    • 17
    • 18
  1. 1.Dipartimento di AstronomiaUniversità degli Studi di PadovaPadovaItaly
  2. 2.INAFOsservatorio Astronomico di PadovaPadovaItaly
  3. 3.Instituto de Astrofísica de Andalucía (CSIC)GranadaSpain
  4. 4.Instituto de AstronomiaUniversidad Nacional Autonoma de Mexico (UNAM)MexicoMexico
  5. 5.Crimean Astrophysical ObservatoryNauchny, CrimeaUkraine
  6. 6.Departamento de Física y Astronomía, Facultad de CienciasUniversidad de ValparaísoValparaísoChile
  7. 7.The Dark Cosmology Centre, The Niels Bohr InstituteUniversity of CopenhagenCopenhagen 0Denmark
  8. 8.Steward Observatory and Department of AstronomyUniversity of ArizonaTucsonUSA
  9. 9.F.R.S. - FNRS, Institute of Astrophysics and GeophysicsUniversity of LiègeLiègeBelgium
  10. 10.Physics DepartmentTechnion - Israel Institute of TechnologyHaifaIsrael
  11. 11.The Pennsylvania State UniversityUniversity ParkUSA
  12. 12.Observatorio Astronómico de la Univ. Nac. de CórdobaArgentina, and CONICETArgentina
  13. 13.Instituto de Astrofísica de CanariasTenerifeSpain
  14. 14.National Optical Astronomy ObservatoryTucsonUSA
  15. 15.Department of Astronomy and Astrophysics and Center for Gravitational Wave PhysicsThe Pennsylvania State UniversityUniversity ParkUSA
  16. 16.Deparment of AstronomyRadbound Universiteit NijmegenIMAPPThe Netherlands
  17. 17.ASTRONDwingelooThe Netherlands
  18. 18.Max-Planck Institut für RadioastronomieBonnGermany

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