X-ray timing and spectral observations of active galactic nuclei

Details X-ray timing and spectral observations of active galactic nuclei X-ray timing and spectral observations of active galactic nuclei

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..559m&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

16

Active Galactic Nuclei, Astronomical Spectroscopy, Temporal Distribution, X Ray Spectra, Absorption Spectra, Bl Lacertae Objects, Light Curve, Line Spectra, Periodic Variations, Quasars, Radio Galaxies, Seyfert Galaxies

Scientific paper

Timing observations of active galactic nuclei (AGN) reveal variability on all scales from minutes (and possibly shorter) to years, while the spectra are generally best-fitted by power laws, with some lower luminosity AGN showing evidence of absorption by cold gas at low X-ray energies. The X-ray spectral and timing observations, in conjunction with observations in other bands such as those of broad optical emission lines, have led to a generally accepted model for AGN according to which the primary power source is conversion of gravitational potential energy into luminous (heat) energy by accretion of cool matter onto a central massive black hole. The constraints that X-ray timing and spectral observations can place on AGN models are reviewed.

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