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Probing the 3-D matter distribution at $z\sim2$ with QSO multiple lines of sight

Published online by Cambridge University Press:  06 October 2005

S. Cristiani ,
V. D'Odorico ,
F. Saitta ,
M. Viel ,
S. Bianchi ,
B. Boyle ,
S. Lopez ,
J. Maza  and
P. Outram
S. Cristiani
Affiliation:
INAF - Osservatorio Astronomico di Trieste, via G.B. Tiepolo, 11 I-34131 Trieste, Italy, email: cristiani@ts.astro.it, dodorico@ts.astro.it
V. D'Odorico
Affiliation:
INAF - Osservatorio Astronomico di Trieste, via G.B. Tiepolo, 11 I-34131 Trieste, Italy, email: cristiani@ts.astro.it, dodorico@ts.astro.it
F. Saitta
Affiliation:
Dipartimento di Astronomia, Università degli Studi di Trieste, via G.B. Tiepolo, 11 I-34131 Trieste, Italy
M. Viel
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA
S. Bianchi
Affiliation:
INAF-Istituto di Radioastronomia/Sez. Firenze, Largo Enrico Fermi, 5, I-50125 Firenze, Italy
B. Boyle
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping NSW 1710, Australia
S. Lopez
Affiliation:
Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile
J. Maza
Affiliation:
Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile
P. Outram
Affiliation:
Department of Physics, University of Durham, South Road, Durham, DH1 3LE
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Abstract

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We investigate the 3-D matter distribution at $z\sim 2$ with high resolution ($R\sim 40,000$) spectra of QSO pairs and groups obtained with the UVES spectrograph at ESO VLT. Our sample is unique for the number density of objects and the variety of separations, between $\sim 0.5$ and 7 proper Mpc. We compute the real space cross-correlation function of the Lyman-$\alpha$ forest transmitted fluxes. There is a significant clustering signal up to $\sim 2$ proper Mpc, which is still present when absorption lines with high column density ($\log N \ge 13.8$) are excluded.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C199: Probing Galaxies through Quasar Absorption Lines , March 2005 , pp. 412 - 414
Copyright
© 2005 International Astronomical Union

Footnotes

Based on observations collected at the European Southern Observatory, Chile