Halo Mass of ULIRGs at Cosmic Noon

Abstract We present a clustering analysis of ∼3000 ultraluminous infrared galaxies (ULIRGs) at z  ∼ 2, uniformly selected by 24 μ m flux and IRAC colors in the COSMOS and BOOTES fields. We measure the angular correlation functions of ULIRGs in both fields and fit them with galaxy clustering models. Linear theory modeling shows that these ULIRGs reside in dark matter halos with characteristic masses of log [ M h / ( h − 1 M ⊙ ) ] = 12.64 ± 0.50 in COSMOS and 12.72 ± 0.13 in BOOTES. Halo occupation distribution (HOD) modeling yields occupation-weighted effective halo masses of log [ M eff / ( h − 1 M ⊙ ) ] = 12.5 0 − 0.28 + 0.26 for COSMOS and 12.8 9 − 0.12 + 0.11 for BOOTES. These host halos are expected to evolve into halos with masses of ∼10 13.6−13.9 h −1 M ⊙ at z = 0. The HOD fits allow for a non-negligible satellite contribution to the clustering of galaxies in the BOOTES field, but the satellite fraction derived in the COSMOS field appears nearly zero.