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The Lyα Forest towards HS1700+6416 at High Resolution

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QSO Absorption Lines

Part of the book series: ESO Astrophysics Symposia ((ESO))

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Abstract

We have analyzed high resolution (b ≈ 15 km/s) optical spectra of the QSO HS1700+6416 (z em = 2.72). The high S/N ratio in the Lyα forest allows a reasonable determination of the neutral hydrogen column density as well as of the velocity dispersion of the clouds. A weak, but significant, trend for stronger lines to be broader suggests that their column densities (N HI) and Doppler parameters (b) are related. A simplified model of very flattened, highly ionized clouds, gravitationally confined by dark matter, gives a good representation of the data, where the observed N HI−b correlation is due to orientation effects.

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Author information

Authors and Affiliations

  1. ESA IUE Observatory, P.O. Box 50727, 28080, Madrid, Spain

    P. M. Rodríguez-Pascual, M. C. Recondo & W. Wamsteker

  2. INSA/VILSPA, P.O. Box 50727, 28080, Madrid, Spain

    A. de la Fuente

  3. Depto. Física Moderna, Univ. de Cantabria, 39005, Santander, Spain

    J. L. Sanz

  4. ESA ISO Observatory, P.O. Box 50727, 28080, Madrid, Spain

    J. Clavel

  5. Observatoire de Paris, RA 173 CNRS, 92135, Meudon, France

    M. Santos-Lleó

Authors
  1. P. M. Rodríguez-Pascual
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  2. A. de la Fuente
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  3. J. L. Sanz
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  4. M. C. Recondo
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  5. J. Clavel
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  6. M. Santos-Lleó
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  7. W. Wamsteker
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Editor information

Editors and Affiliations

  1. European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748, Garching, Germany

    Georges Meylan

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© 1995 Springer-Verlag Berlin Heidelberg

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Rodríguez-Pascual, P.M. et al. (1995). The Lyα Forest towards HS1700+6416 at High Resolution. In: Meylan, G. (eds) QSO Absorption Lines. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-49458-4_66

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  • DOI: https://doi.org/10.1007/978-3-540-49458-4_66

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-662-22373-4

  • Online ISBN: 978-3-540-49458-4

  • eBook Packages: Springer Book Archive

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