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Narrow and variable lines in the ultraviolet spectrum of the Seyfert galaxy NGC4151

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Abstract

The Seyfert galaxy NGC4151 observed when the nucleus is at a minimum has two emission lines of full width at half maximum <7 and 16 Å respectively and varying in intensity by a factor of three in 10 days. These lines are too narrow to be emitted by the whole broad-line region and must arise instead from two localized regions which have a special excitation mechanism, possibly a two-sided jet.

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Authors and Affiliations

  1. European Southern Observatory, 8046, Garching bei München, FRG

    M. H. Ulrich

  2. Instituto Astronomico dell'Università, Via Lancisi 29, 00161, Roma, Italy

    A. Altamore & G. C. Perola

  3. Royal Greenwich Observatory, Herstmonceaux Castle, Hailsham, East Sussex, BN27 1RP, UK

    A. Boksenberg, M. V. Penston & M. A. J. Snijders

  4. Astrophysics Group, Rutherford and Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 OQX, UK

    G. E. Bromage

  5. Observatoire de Meudon, Meudon, 92190, France

    J. Clavel

  6. ESA Villafranca Tracking Station, Apdo 54065, Madrid, Spain

    J. Clavel

  7. Stockholm Observatory, 1330, Saltsjöbaden, Sweden

    A. Elvius

Authors
  1. M. H. Ulrich
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  2. A. Altamore
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  3. A. Boksenberg
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  4. G. E. Bromage
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  5. J. Clavel
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  6. A. Elvius
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  7. M. V. Penston
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  8. G. C. Perola
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  9. M. A. J. Snijders
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Ulrich, M., Altamore, A., Boksenberg, A. et al. Narrow and variable lines in the ultraviolet spectrum of the Seyfert galaxy NGC4151. Nature 313, 747–751 (1985). https://doi.org/10.1038/313747a0

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  • DOI: https://doi.org/10.1038/313747a0

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