Echo Mapping of Active Galactic Nuclei

  title={Echo Mapping of Active Galactic Nuclei},
  author={B. M. Peterson and Keith D. Horne},
  journal={Astronomische Nachrichten},
Echo mapping exploits light travel time delays, revealed by multi-wavelength variability studies, to map the geometry, kinematics, and physical conditions of reprocessing sites in photo-ionized gas flows. In active galactic nuclei (AGN), the ultraviolet to near infrared light arises in part from reprocessing of EUV and X-ray light from a compact and erratically variable source in the nucleus. The observed time delays, 0.1- 2 days for the continuum and 1-100 days for the broad emission lines… 

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