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We compare the physical and morphological properties of z ~ 2 Lyman-alphaemitting galaxies (LAEs) identified in the HETDEX Pilot Survey and narrow bandstudies with those of z ~ 2 optical emission line galaxies (oELGs) identifiedvia HST WFC3 infrared grism spectroscopy. Both sets of galaxies extend over thesame range in stellar mass (7.5 < logM < 10.5), size (0.5 < R < 3.0 kpc), andstar-formation rate (~1 < SFR < 100). Remarkably, a comparison of the mostcommonly used physical and morphological parameters -- stellar mass, half-lightradius, UV slope, star formation rate, ellipticity, nearest neighbor distance,star formation surface density, specific star formation rate, [O III]luminosity, and [O III] equivalent width -- reveals no statisticallysignificant differences between the populations. This suggests that theprocesses and conditions which regulate the escape of Ly-alpha from a z ~ 2star-forming galaxy do not depend on these quantities. In particular, the lackof dependence on the UV slope suggests that Ly-alpha emission is not beingsignificantly modulated by diffuse dust in the interstellar medium. We developa simple model of Ly-alpha emission that connects LAEs to all high-redshiftstar forming galaxies where the escape of Ly-alpha depends on the sightlinethrough the galaxy. Using this model, we find that mean solid angle forLy-alpha escape is 2.4+/-0.8 steradians; this value is consistent with thosecalculated from other studies.

HST Emission Line Galaxies at z ~ 2: Comparing Physical Properties of Lyman Alpha and Optical Emission Line Selected Galaxies