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We present the results of a search for molecular gas emission from astar-forming galaxy at z = 4.9. The galaxy benefits from magnification of 22+/- 5x due to strong gravitational lensing by the foreground cluster MS1358+62.We target the CO(5-4) emission at a known position and redshift from existingHubble Space Telescope/ACS imaging and Gemini/NIFS [OII]3727 imagingspectroscopy, and obtain a tentative detection at the 4.3sigma level with aflux of 0.104 +/- 0.024Jkm/s. From the CO line luminosity and assuming aCO-to-H2 conversion factor alpha=2, we derive a gas mass M_gas ~ 1^{+1}_{-0.6}x 10^9 M_sun. Combined with the existing data, we derive a gas fractionMgas/(Mgas + M*) = 0.59^{+0.11}_{-0.06}. The faint line flux of this galaxyhighlights the difficulty of observing molecular gas in representative galaxiesat this epoch, and suggests that routine detections of similar galaxies in theabsence of gravitational lensing will remain challenging even with ALMA in fullscience operations.

Observational limits on the gas mass of a z=4.9 galaxy