Bielby, R.M.

Bornancini, C.

Bouch\ue9, N.

Crighton, N.H.M.

Heraudeau, P.

Infante, L.

Lambas, D.G.

Lowenthal, J.

Minniti, D.

Padilla, N.

Petitjean, P.

Shanks, T.

Theuns, Tom

Weilbacher, P.M.

Abstract: We present the initial imaging and spectroscopic data acquired as part of the Very Large Telescope (VLT) VIMOS Lyman-break galaxy Survey. UBR (or UBVI) imaging covers five  4836 
7 36 arcmin2 fields centred on bright z > 3 quasi-stellar objects (QSOs), allowing  4821 000 2  2 Lyman-break galaxies and 10 z > 2 QSOs from a total of 19 VIMOS pointings. From the galaxy spectra, we observe a 625 \ub1 510 km s 121 velocity offset between the interstellar absorption and Lyman \u3b1 emission-line redshifts, consistent with previous results. Using the photometric and spectroscopic catalogues, we have analysed the galaxy clustering at z 48 3. The angular correlation function, w(\u3b8), is well fitted by a double power law with clustering scalelength, r0= 3.19+0.32 120.54 h 121 Mpc and slope \u3b3= 2.45 for r < 1 h 121 Mpc and r0= 4.37+0.43 120.55 h 121 Mpc with \u3b3= 1.61 \ub1 0.15 at larger scales. Using the redshift sample we estimate the semiprojected correlation function, wp(\u3c3), and, for a \u3b3= 1.8 power law, find r0= 3.67+0.23 120.24 h 121 Mpc for the VLT sample and r0= 3.98+0.14 120.15 h 121 Mpc for a combined VLT+Keck sample. From \u3be(s) and \u3be(\u3c3, \u3c0), and assuming the above \u3be(r) models, we find that the combined VLT and Keck surveys require a galaxy pairwise velocity dispersion of  48700 km s 121, higher than  48400 km s 121 assumed by previous authors. We also measure a value for the gravitational growth rate parameter of \u3b2(z= 3) = 0.48 \ub1 0.17, again higher than that previously found and implying a low value for the bias of b= 2.06+1.1 120.5. This value is consistent with the galaxy clustering amplitude which gives b= 2.22 \ub1 0.16, assuming the standard cosmology, implying that the evolution of the gravitational growth rate is also consistent with Einstein gravity. Finally, we have compared our Lyman-break galaxy clustering amplitudes with lower redshift measurements and find that the clustering strength is not inconsistent with that of low-redshift L* spirals for simple long-lived galaxy models

Institutional Repository Universiteit Antwerpen

The VLT LBG redshift survey : 1 : clustering and dynamics of <tex>\approx1000$</tex> galaxies at <tex>z\approx3$</tex>

The VLT LBG redshift survey : 1 : clustering and dynamics of <tex>\approx1000 $</tex> galaxies at <tex>z\approx3$ </tex>

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Institutional Repository Universiteit Antwerpen

The VLT LBG redshift survey : 1 : clustering and dynamics of <tex>\approx1000</tex>galaxiesat<tex>z≈3</tex> galaxies at <tex>z\approx3</tex>galaxiesat<tex>z≈3</tex>

Abstract

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Full text

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Institutional Repository Universiteit Antwerpen

The VLT LBG redshift survey : 1 : clustering and dynamics of <tex>\approx1000 $</tex> galaxies at <tex>z\approx3$ </tex>