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Warm Gas at High Redshift

Clues to Gravitational Structure Formation from Optical Spectroscopy of Lyman α Absorption Systems

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Cold Gas at High Redshift

Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 206))

Abstract

We discuss the effects of gravitational collapse on the shape of absorption line profiles for low column density (N(HI) < 1014 cm-2) Lyman α forest clouds and argue by comparison with cosmological simulations that Lyman α forest observations show the signs of ongoing gravitational structure formation at high redshift. The departures of observed line profiles from thermal Voigt profiles (caused by bulk motion of infalling gas and compressional heating) are evident from the results of profile fitting as a correlation in velocity space among pairs of components with discrepant Doppler parameters. This correlation also allows us to qualitatively understand the meaning of the Doppler parameter — column density (b-N HI ) diagram for intergalactic gas.

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Author information

Authors and Affiliations

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

    Michael Rauch

Authors
  1. Michael Rauch
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Editor information

Editors and Affiliations

  1. Leiden Observatory, The Netherlands

    M. N. Bremer , P. P. van der Werf  & H. J. A. Röttgering ,  & 

  2. National Radio Astronomy Observatory, Socorro, New Mexico, USA

    C. L. Carilli

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© 1996 Kluwer Academic Publishers

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Rauch, M. (1996). Warm Gas at High Redshift. In: Bremer, M.N., van der Werf, P.P., Röttgering, H.J.A., Carilli, C.L. (eds) Cold Gas at High Redshift. Astrophysics and Space Science Library, vol 206. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1726-2_13

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  • DOI: https://doi.org/10.1007/978-94-009-1726-2_13

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-7273-1

  • Online ISBN: 978-94-009-1726-2

  • eBook Packages: Springer Book Archive

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