Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-03-11
Mon.Not.Roy.Astron.Soc. 359 (2005) 1077-1082
Astronomy and Astrophysics
Astrophysics
7 pages, 5 .ps figures, accepted for pubblication in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.08971.x
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 sub-sample of the ELAIS-S1 catalog covering approximately 4 deg^2 and consisting of 148 objects selected at 15 micron with a flux >0.5 mJy and redshift z<0.5. We detected a positive signal in the correlation function that, in the range of separations 1-10 h mpc is well approximated by a power law with a slope gamma = 1.4 and a correlation length s =5.4 h mpc. This result is in good agreement with the redshift-space correlation function measured in more local samples of mid infrared selected galaxies like the IRAS PSC$z$ 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
Baccetti Valentina
Branchini Enzo
D'Elia Valerio
Gruppioni Carlotta
La Franca Fabio
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