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Fifty Years of Quasars. Quasars Classes and Their Relationships
D'Onofrio, Mauro; Marziani, Paola; Sulentic, Jack W. et al.
2012In D'Onofrio, M. (Ed.) Fifty Years of Quasars: From Early Observations and Ideas to Future Research
 

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Keywords :
Physics
Abstract :
[en] 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
D'Onofrio, Mauro;  Dipartimento di Astronomia, Università degli Studi di Padova
Marziani, Paola;  INAF, Osservatorio Astronomico di Padova
Sulentic, Jack W.;  Instituto de Astrofísica de Andalucía (CSIC)
Dultzin, Deborah;  Instituto de Astronomia, Universidad Nacional Autonoma de Mexico (UNAM)
Efimov, Yuri;  Crimean Astrophysical Observatory
Gaskell, Martin;  Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso
Vestergaard, Marianne;  The Dark Cosmology Centre, The Niels Bohr Institute, University of Copenhagen ; Steward Observatory and Department of Astronomy, University of Arizona
Hutsemekers, Damien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Franceschini, Alberto;  Dipartimento di Astronomia, Università degli Studi di Padova
Laor, Ari;  Physics Department, Technion - Israel Institute of Technology
Grupe, Dirk;  The Pennsylvania State University
Lipari, Sebastian;  Observatorio Astronómico de la Univ. Nac. de Córdoba
Lorenzo, Begoña Garcıa;  Instituto de Astrofísica de Canarias
Mediavilla, Evencio;  Instituto de Astrofísica de Canarias
Boroson, Todd;  National Optical Astronomy Observatory
Eracleous, Mike;  Department of Astronomy and Astrophysics and Center for Gravitational Wave Physics, The Pennsylvania State University
Marquez-Perez, Isabel;  Instituto de Astrofísica de Andalucía (CSIC)
Körding, Elmar;  Deparment of Astronomy, Radbound Universiteit Nijmegen
Falcke, Heino;  Deparment of Astronomy, Radbound Universiteit Nijmegen ; , ASTRON)
More authors (9 more) Less
Language :
English
Title :
Fifty Years of Quasars. Quasars Classes and Their Relationships
Publication date :
2012
Main work title :
Fifty Years of Quasars: From Early Observations and Ideas to Future Research
Editor :
D'Onofrio, M.
Publisher :
Springer, Heidelberg, Germany
ISBN/EAN :
978-3-642-27563-0
Collection name :
Astrophysics and Space Science Library, Volume 386
Pages :
217-286
Available on ORBi :
since 25 September 2012

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