Large Scale Structure in the ELAIS S1 Survey

Details Large Scale Structure in the ELAIS S1 Survey Large Scale Structure in the ELAIS S1 Survey

2003-12-17

arxiv.org/abs/astro-ph/0312451v2

Mon.Not.Roy.Astron.Soc. 352 (2004) 44

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, revised version submitted to MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07890.x

We present an analysis of the two-point angular correlation function of the ELAIS S1 survey. The survey covers 4 deg$^2$ and contains 462 sources detected at 15$\mu$m to a 5$\sigma$ flux limit of 0.45 mJy. Using the 329 extragalactic sources not repeated in different observations, we detect a significant clustering signal; the resulting angular correlation function can be fitted by a exponential law $w(\theta) = A \theta^{1-\gamma}$ with $A = 0.014\pm0.005$ and $\gamma = 2.04\pm0.18$. Assuming a redshift distribution of the objects, we invert Limber's equation and deduce a spatial correlation length $r_0=4.3^{+0.4}_{-0.7} h^{-1}$ Mpc. This is smaller than that obtained from optical surveys but it is in agreement with results from IRAS. This extends to higher redshift the observational evidence that infrared selected surveys show smaller correlation lengths (i.e. reduced clustering amplitudes) than optical surveys.

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