We present first insights into the far-IR properties for a sample of IRAC and MIPS-24 \mu m detected Lyman Break Galaxies ( LBGs ) at z \sim 3 , as derived from observations in the northern field of the Great Observatories Origins Survey ( GOODS-N ) carried out with the PACS instrument on board the Herschel Space Observatory .
Although none of our galaxies are detected by Herschel , we employ a stacking technique to construct , for the first time , the average spectral energy distribution of infrared luminous LBGs from UV to radio wavelengths .
We derive a median IR luminosity of L _ { IR } = 1.6 \times 10 ^ { 12 } L _ { \odot } , placing the population in the class of ultra luminous infrared galaxies ( ULIRGs ) .
Complementing our study with existing multi-wavelength data , we put constraints on the dust temperature of the population and find that for their L _ { IR } , MIPS-LBGs are warmer than submm-luminous galaxies while they fall in the locus of the L _ { IR } - T { } _ { d } relation of the local ULIRGs .
This , along with estimates based on the average SED , explains the marginal detection of LBGs in current sub-mm surveys and suggests that these latter studies introduce a bias towards the detection of colder ULIRGs in the high- z universe , while missing high- z ULIRGS with warmer dust .