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The mean HI optical depth of the intergalactic medium

Published online by Cambridge University Press:  06 October 2005

Alireza Aghaee ,
Patrick Petitjean ,
Bastien Aracil ,
Frank Coppolani  and
Tom Theuns
Alireza Aghaee
Affiliation:
Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France email: [email protected] Department of Physics, University of Sistan and Baluchestan, 98135 Zahedan, Iran
Patrick Petitjean
Affiliation:
Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France email: [email protected] LERMA, Observatoire de Paris-Meudon, 61 avenue de l'Observatoire, 75014 Paris, France email: [email protected]
Bastien Aracil
Affiliation:
Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003-9305, US, email: [email protected]
Frank Coppolani
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Vitacura Casilla 19001, Santiago 19, Chile, email: [email protected]
Tom Theuns
Affiliation:
Institute for Computational Cosmology, Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK, email: [email protected]
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Abstract

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The intergalactic medium revealed by the numerous absorption lines seen in quasar spectra (the so-called Ly $\alpha$ forest) is believed to trace the potential wells of the dark matter. This is a unique tool to derive the power-spectrum of the initial fluctuations from high resolution and high S/N ratio spectra. One of the major limitations in these studies is the accuracy to which the quasar continuum is known. To investigate this problem, we have observed at intermediate spectral resolution ten bright and high redshift quasars (2.1 $< z_{em} <$ 4.7) that have also been observed with UVES. We shall compare the continuum determinations for both data sets.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C199: Probing Galaxies through Quasar Absorption Lines , March 2005 , pp. 397 - 399
Copyright
© 2005 International Astronomical Union