The redshift-space two-point correlation function of ELAIS-S1 galaxies

V. D'Elia*, E. Branchini, F. La Franca, V. Baccetti, I. Matute, F. Pozzi, C. Gruppioni

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We investigate the clustering properties of galaxies in the recently completed ELAIS-S1 redshift survey through their spatial two-point autocorrelation function. We used a subsample of the ELAIS-S1 catalogue covering approximately 4 deg2 and consisting of 148 objects selected at 15 μm with a flux >0.5 mJy and a redshift z < 0.5. We detected a positive signal in the correlation function that in the range of separations 1-10 h -1 Mpc is well approximated by a power law with a slope γ = 1.4 ± 0.25 and a correlation length s0 = 5.4 ±1.2 h -1 Mpc, at the 90 per cent significance level. This result is in good agreement with the redshift-space correlation function measured in more local samples of mid-infrared-selected galaxies such as the IRAS Point Source Catalog (PSCz) redshift survey. This suggests a lack of significant clustering evolution of infrared-selected objects out to z = 0.5 that is further confirmed by the consistency found between the correlation functions measured in a local (z < 0.2) and a distant (0.2 < z < 0.5) subsample of ELAIS-S1 galaxies. We also confirm that optically selected galaxies in the local redshift surveys, especially those of the SDSS sample, are significantly more clustered than infrared objects.

Original languageEnglish
Pages (from-to)1077-1082
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 2005
Externally publishedYes


  • galaxies: clusters: general
  • galaxies: evolution
  • cosmology: observations
  • large-scale structure of Universe
  • infrared: galaxies


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