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We recently reported the discovery of FORJ0332−3557, a lensed Lyman‐break galaxy at   z = 3.77  in a remarkable example of strong galaxy–galaxy gravitational lensing. We present here a medium‐resolution rest‐frame ultraviolet (UV) spectrum of the source, which appears to be similar to the well‐known Lyman‐break galaxy MS1512−cB58 at   z = 2.73 . The spectral energy distribution is consistent with a stellar population of less than 30 Ma, with an extinction of   A   v  = 0.5  mag and an extinction‐corrected star formation rate  SFR UV   of 200– 300  h  −1  70  M ⊙  a −1  . The Lyα line exhibits a damped profile in absorption produced by a column density of about   N  H  i  = (2.5 ± 1.0) × 10 21  cm −2  , superimposed on an emission line shifted both spatially (0.5 arcsec with respect to the UV continuum source) and in velocity space ( +830 km s −1   with respect to the low‐ionization absorption lines from its interstellar medium), a clear signature of outflows with an expansion velocity of about  270 km s −1  . A strong emission line from He  ii λ164.04 nm indicates the presence of Wolf–Rayet stars and reinforces the interpretation of a very young starburst. The metallic lines indicate subsolar abundances of elements Si, Al and C in the ionized gas phase.

monthly notices of the royal astronomical society

Medium‐resolution spectroscopy of FORJ0332−3557: probing the interstellar medium and stellar populations of a lensed Lyman‐break galaxy at  z = 3.77  ★