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Active galactic nuclei.

A C Fabian1

  • 1Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|April 29, 1999
PubMed
Summary
This summary is machine-generated.

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Active galactic nuclei, powered by massive black hole accretion, are the Universe's most potent objects. Their underestimated cosmic contribution is due to common obscuration and outflows.

Area of Science:

  • Cosmic evolution
  • Astrophysics
  • Black hole physics

Background:

  • Active galactic nuclei (AGN) are exceptionally powerful and enduring cosmic phenomena.
  • Current theories posit that AGN are fueled by matter accreting onto supermassive black holes.
  • The full impact of AGN on the Universe's energy budget may be larger than previously thought.

Purpose of the Study:

  • To confirm the theoretical model of massive black hole accretion as the power source for active galactic nuclei.
  • To investigate the role of obscuration and outflows in the observed energy output of AGN.
  • To re-evaluate the contribution of AGN to the overall energy density of the Universe.

Main Methods:

  • Analysis of recent observational data from various astronomical surveys.

Related Experiment Videos

  • Comparison of empirical data with theoretical models of black hole accretion disks.
  • Investigating the prevalence and impact of obscuring material and relativistic jets in AGN.

    • Main Results:

    • Recent data provide strong support for the accretion of matter onto massive black holes as the primary energy source for AGN.
    • Obscuration and outflows are frequently observed phenomena in active galactic nuclei.
    • These factors suggest that the energy output of AGN has been systematically underestimated in previous cosmological models.

    Conclusions:

    • The findings confirm the central role of massive black holes in powering the most luminous objects in the Universe.
    • The prevalence of obscuration and outflows necessitates a revision of AGN contribution to cosmic energy density.
    • Active galactic nuclei likely play a more significant role in the Universe's energetic processes than currently accounted for.