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Astrophysics and Space Science

, Volume 356, Issue 2, pp 339–346 | Cite as

UV spectral diagnostics for low redshift quasars: estimating physical conditions and radius of the broad line region

  • P. Marziani
  • J. W. Sulentic
  • C. A. Negrete
  • D. Dultzin
  • A. Del Olmo
  • M. A. Martínez Carballo
  • T. Zwitter
  • R. Bachev
Original Article

Abstract

The UV spectral range (1100–3000 Å) contains the strongest resonance lines observed in active galactic nuclei (AGN). Analysis of UV line intensity ratios and profile shapes in quasar spectra provide diagnostics of physical and dynamical conditions in the broad line emitting region. This paper discusses properties of UV lines in type-1 AGN spectra, and how they lead an estimate of ionizing photon flux, chemical abundances, radius of the broad line emitting region and central black hole mass. These estimates are meaningfully contextualised through the 4D “eigenvector-1” (4DE1) formalism.

Keywords

Galaxies: active Quasars: emission lines Quasars: general Techniques: spectroscopic Astronomical databases: surveys 

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • P. Marziani
    • 1
  • J. W. Sulentic
    • 2
  • C. A. Negrete
    • 3
  • D. Dultzin
    • 4
  • A. Del Olmo
    • 2
  • M. A. Martínez Carballo
    • 2
  • T. Zwitter
    • 5
  • R. Bachev
    • 6
  1. 1.INAFOsservatorio Astronomico di PadovaPadovaItaly
  2. 2.Instituto de Astrofísica de Andalucía (CSIC)GranadaSpain
  3. 3.INAOETonantzintlaMexico
  4. 4.Instituto de AstronomíaUNAMMexico, D.F.Mexico
  5. 5.Faculty of Mathematics and PhysicsUniversity of LjubljanaLjubljanaSlovenia
  6. 6.Bulgarian Academy of ScienceSofiaBulgaria

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