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We examine the Mg II 2796, 2803 Angstrom, Lyman alpha, and nebular lineemission in five bright star-forming galaxies at 1.66<z<1.91 that have beengravitationally lensed by foreground galaxy clusters. All five galaxies showprominent Mg II emission and absorption in a P Cygni profile. We find nocorrelation between the equivalent widths of Mg II and Lyman alpha emission.The Mg II emission has a broader range of velocities than do the nebularemission line profiles; the Mg II emission is redshifted with respect tosystemic by 100 to 200 km/s. When present, Lyman alpha is even more redshifted.The reddest components of Mg II and Lyman alpha emission have tails to 500-600km/s, implying a strong outflow. The lack of correlation in the Mg II and Lymanalpha equivalent widths, the differing velocity profiles, and the high ratiosof Mg II to nebular line fluxes together suggest that the bulk of Mg IIemission does not ultimately arise as nebular line emission, but may instead bereprocessed stellar continuum emission.

On the lack of correlation between Mg II 2796, 2803 Angstrom and Lyman alpha emission in lensed star-forming galaxies