X-ray spectra of active galaxies and quasars

M. Elvis, A. Lawrence

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)


The existing X-ray spectral data for active galaxies and quasars is reviewed. These exist mainly for type 1 Seyferts, quasars, and BL Lacs. There is little data yet for radio galaxies, type 2 Seyferts or low ionization nuclear emission-line regions. A variety of different power-law slopes exist for quasar and Seyfert 1 spectra, implying that several different emission mechanisms can make X-rays in AGN. Material within the active nucleus causes low energy X-ray absorption, primarily for low luminosity objects. Absorption can be used to constrain the physical state, abundance, and geometry of this nuclear material. The prospects for future X-ray satellite missions are outlined, with an emphasis on high resolution spectroscopy from AXAF.
Original languageEnglish
Title of host publicationAstrophysics of active galaxies and quasi-stellar objects
PublisherUniversity Science Books
ISBN (Print) 0935702210
Publication statusPublished - 31 Dec 1985


  • Active Galaxies
  • Astronomical Spectroscopy
  • Galaxies
  • Quasars
  • Spectrum Analysis
  • X Ray Astronomy
  • Absorption Spectra
  • Active Galactic Nuclei
  • Bl Lacertae Objects
  • Continuous Spectra
  • Emission Spectra
  • Luminosity
  • Radio Galaxies
  • Seyfert Galaxies
  • X Ray Spectra


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