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Pré-Publication, Document De Travail Année : 2006

The VIMOS-VLT Deep Survey: Luminosity dependence of clustering at z~1

V. Le Brun
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L. Tresse
G. Vettolani
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A. Zanichelli
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M. Bolzonella
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O. Ilbert
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B. Marano
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M. Bondi
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A. Bongiorno
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L. Gregorini
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D. Rizzo
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Résumé

We investigate the dependence of galaxy clustering on the galaxy intrinsic luminosity at high redshift, using the data from the First Epoch VIMOS-VLT Deep Survey (VVDS). The size (6530 galaxies) and depth (IAB<24) of the survey allows us to measure the projected two-point correlation function of galaxies, w_p(r_p), for a set of volume-limited samples up to an effective redshift =0.9 and median absolute magnitude -19.6< MB < -21.3. Fitting w_p(r_p) with a single power-law model for the real-space correlation function ξ(r)=(r/r_0)-γ, we measure the relationship of the correlation length r0 and the slope γ with the sample median luminosity for the first time at such high redshift. Values from our lower-redshift samples (0.1=-19.6) have a correlation length r_0=2.7+0.3-0.3 h-1 Mpc, compared to r_0=5.0+1.5-1.6 h-1 Mpc at =-21.3. The slope of the correlation function is observed to correspondingly steepen significantly from γ=1.6+0.1-0.1 to γ=2.4+0.4-0.2. This is not observed either by large local surveys or in our lower-redshift samples and seems to imply a significant change in the way luminous galaxies trace dark-matter halos at z∼ 1 with respect to z∼ 0. At our effective median redshift z ≃ 0.9 this corresponds to a strong difference of the relative bias, from b/b* < 0.7 for galaxies with L < L* to b/b* ≃ 1.4 for galaxies with L > L*.
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Dates et versions

hal-00083041 , version 1 (07-09-2023)

Identifiants

Citer

A. Pollo, L. Guzzo, O. Le Fèvre, B. Meneux, A. Cappi, et al.. The VIMOS-VLT Deep Survey: Luminosity dependence of clustering at z~1. 2006. ⟨hal-00083041⟩
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