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We measure the angular clustering of 33 415 extremely red objects (EROs) inthe Elais-N1 field covering 5.33 deg$^{2}$, which cover the redshift range$z=0.8$ to $2$. This sample was made by merging the UKIDSS Deep eXtragalacticSurvey (DXS) with the optical Subaru and Pan-STARRS PS1 datasets. We confirmthe existence of a clear break in the angular correlation function at $\sim0.02^{\circ}$ corresponding to $1 h^{-1}$ Mpc at $z\sim1$. We find that redderor brighter EROs are more clustered than bluer or fainter ones. Halo OccupationDistribution (HOD) model fits imply that the average mass of dark matter haloeswhich host EROs is over $10^{13} h^{-1} M_{\odot}$ and that EROs have a biasranging from 2.7 to 3.5. Compared to EROs at $z\sim1.1$, at $z\sim1.5$ EROshave a higher bias and fewer are expected to be satellite galaxies.Furthermore, EROs reside in similar dark matter haloes to those that host$10^{11.0} M_{\odot}<M_{*}<10^{11.5} M_{\odot}$ galaxies. We compare our newmeasurement and HOD fits with the predictions of the GALFORM semi-analyticalgalaxy formation model. Overall, the clustering predicted by GALFORM gives anencouraging match to our results. However, compared to our deductions from themeasurements, GALFORM puts EROs into lower mass haloes and predicts that alarger fraction of EROs are satellite galaxies. This suggests that thetreatment of gas cooling may need to be revised in the model. Our analysisillustrates the potential of clustering analyses to provide observationalconstraints on theoretical models of galaxy formation.

Clustering of Extremely Red Objects in Elais-N1 from the UKIDSS DXS with optical photometry from Pan-STARRS1 and Subaru