Herschel ATLAS:? The angular correlation function of submillimetre

(Affiliations can be found after the references) We present measurements of the angular correlation function of galaxies selected from the first field of the H-ATLAS survey. Careful removal of the background from galactic cirrus is essential, and currently dominates the uncertainty in our measurements. For our 250 µm-selected sample we detect no significant clustering, consistent with the expectation that the 250 µm-selected sources are mostly normal galaxies at z. 1. For our 350 µm and 500 µm-selected samples we detect relatively strong clustering with correlation amplitudes A of 0.2 and 1.2 at 1′, but with relatively large uncertainties. For samples which preferentially select high redshift galaxies at z ∼ 2 − 3 we detect significant strong clustering, leading to an estimate of r0 ∼ 7−11 h−1 Mpc. The slope of our clustering measurements is very steep, δ ∼ 2. The measurements are consistent with the idea that sub-mm sources consist of a low redshift population of normal galaxies and a high redshift population of highly clustered star-bursting galaxies. Key words. Submm galaxies –Galaxy clustering 1