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Radiative acceleration of gas in quasars

Nature volume 376, pages 576–578 (1995)Cite this article

Abstract

QUASARS can radiate up to a thousand times the energy of the entire Galaxy, yet this energy is generated in a small region approximately one light day across. (By comparison, the diameter of the Milky Way is about 100,000 light years.) Because of the high energy density in this region, it has often been suggested that radiation pressure might play an important dynamical role in quasars1á¤-3. Here we show that radiative acceleration can readily explain a prominent feature observed in the spectra of several broad-absorption-line (BAL) quasars. The broad absorption lines are themselves attributed to matter flowing towards the observer with velocities approaching one-tenth of the speed of light4,5, and our results suggest that radiative acceleration is the dominant driving mechanism in these outflows. As most quasars are believed to have BAL outflows6 (although they are seen in only about 10% of them because of viewing angle7,8), radiative acceleration is likely to be an important dynamical process in quasars in general.

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Authors and Affiliations

  1. Theoretical Astrophysics, California Institute of Technology 130-33,

    N. Arav

  2. Department of Astronomy, California Institute of Technology 105-24, Pasadena, California, 91125, USA

    T. A. Barlow

  3. Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky, 40506-0055, USA

    K. T. Korista

  4. Joint Institute for Laboratory Astrophysics and Department of Astrophysical, Planetary, and Atmospheric Sciences, University of Colorado, Boulder, Colorado, 80309-0440, USA

    Begelman

Authors
  1. N. Arav
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  2. K. T. Korista
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  3. T. A. Barlow
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  4. Begelman
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Arav, N., Korista, K., Barlow, T. et al. Radiative acceleration of gas in quasars. Nature 376, 576–578 (1995). https://doi.org/10.1038/376576a0

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