Rest-frame UV to optical X-shooter spectrum of the gravitationally lensed galaxy ``the 8 o_s14clock arc_s14_s14: Dissection of its physical properties

Abstract

We present the rest-frame UV to optical spectrum of the gravitationally lensed galaxy, the ``8 o_s14clock arc_s14_s14 at z=2.735, obtained with the X-shooter spectrograph. This is one of the rare comprehensive study of a high-redshift star-forming galaxy, usually not feasible due to the faintness of these objects. The spectrum of the 8 o_s14clock arc is rich in stellar and interstellar absorption features and in nebular emission features. Their analysis allowed us to derive most of the physical properties characterizing the galaxy. From HST images, we reconstruct the morphology of the arc in the source plane and confirm that we resolve a clump in rotation around the main core of galaxy in our X-shooter spectrum.