SIMBAD references

Aims. This work explores, from a statistical point of view, the rest-frame far-ultraviolet (FUV) to far-infrared (FIR) emission of a population of Lyman-break galaxies (LBGs) at z∼3 that cannot be individually detected from current FIR observations.
Methods. We performed a stacking analysis over a sample of ∼17000 LBGs at redshift 2.5<z<3.5 in the COSMOS field. The sample is binned as a function of UV luminosity (L_FUV), UV continuum slope (β_UV), and stellar mass (M_*), and then stacked at optical (BVriz bands), near-infrared (YJHK_s bands), IRAC (3.6, 4.5, 5.6, and 8.0µm), MIPS (24µm), PACS (100 and 160µm), SPIRE (250, 350, and 500µm), and AzTEC (1.1mm) observations. We obtained 30 rest-frame FUV-to-FIR spectral energy distributions (SEDs) of LBGs at z∼3, and analyzed these with the CIGALE SED-fitting analysis code. We were able to derive fully consistent physical parameters, that is, M_*, β_UV, L_FUV, L_IR, A_FUV, star formation rate, and the slope of the dust attenuation law; we built a semiempirical library of 30 rest-frame FUV-to-FIR stacked LBG SEDs as functions of L_FUV, β_UV, and M_*.
Results. We used the so-called IR-excess (IRX∼L_IR/L_FUV) to investigate the dust attenuation as a function of β_UV and M_*. Our LBGs, averaged as a function of β_UV, follow the well-known IRX-β_UV calibration of local starburst galaxies. Stacks as a function of M_* follow the IRX-M_* relationship presented in the literature at high M_* (log(M_*[M_☉])>10). However, a large dispersion is shown in the IRX-β_UV and IRX-M_* planes, in which the β_UV and M_* are combined to average the sample. Additionally, the SED-fitting analysis results provide a diversity of dust attenuation curve along the LBG sample, and their slopes are well correlated with M_*. Steeper dust attenuation curves than Calzetti's are favored in low stellar mass LBGs (log(M_*[M_☉])<10.25), while grayer dust attenuation curves are favored in high stellar mass LBGs (log(M_*[M_☉])>10.25). We also demonstrate that the slope of the dust attenuation curves is one of the main drivers that shapes the IRX-β_UV plane.