Vol. 554
In section 1. Letters

Far-infrared-detected Lyman-break galaxies at z ~ 3

by I. Oteo, J. Cepa, Á. Bongiovanni, A.M. Pérez-García, B. Cedrés, H. Domínguez Sánchez, A. Ederoclite, M. Sánchez-Portal, I. Pintos-Castro, and R. Pérez-Martínez A&A 554, L3

Lyman-break galaxies (LBGs) are high-z star-forming objects, selected in the optical domain. Their dust content was not well known until now. This work explores the far-infrared (FIR) emission of a sample of 16 LBGs at z =3 in the GOODS fields detected by PACS onboard Herschel. These detected LBGs have been identified as ultra (or hyper) luminous IR galaxies. They are affected by extinction to such an extreme that previous methods to determine their star formation rate (SFR) were in error by large factors. Compared to LBGs at z=1, these dusty objects have more FIR emission and have higher SFR for a given stellar mass than their dustier counterparts at z=1.