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Article Dans Une Revue The Messenger Année : 2006

Transverse and Longitudinal Correlation Functions in the Intergalactic Medium

Résumé

The Intergalactic Medium can be studied using the imprint left in the spectra of background quasars, the so-called Lyman-α forest. The correlations between absorption features observed along the lines of sight to the quasars have been studied to derive information on the clustering properties of the IGM structures. Very few observations have been performed so far of the correlation of the absorption along two different lines of sight separated by a few arc-minutes in the sky. The comparison of the correlation functions along the line of sight (longitudinal direction on a velocity scale) and in the perpendicular direction (on an angular scale) can be used to constrain the geometry of the Universe. We have recently completed a study of the transverse and longitudinal flux correlation functions of the Lyman-α forest in quasar absorption spectra at z ~ 2.1 from VLT-FORS and VLT-UVES observations of a total of 32 pairs of quasars with separations in the range 0.6 < θ < 10 arcmin and found a correlation signal up to 3-5 arcmin.
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Dates et versions

insu-04054620 , version 1 (31-03-2023)

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F. Coppolani, P. Petitjean, F. Stoehr, E. Rollinde, C. Pichon, et al.. Transverse and Longitudinal Correlation Functions in the Intergalactic Medium. The Messenger, 2006, 125, pp.24. ⟨insu-04054620⟩
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