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We analyze the spectral energy distributions (SEDs) of Lyman break galaxies(LBGs) at z=1-3 selected using the Hubble Space Telescope (HST) Wide FieldCamera 3 (WFC3) UVIS channel filters. These HST/WFC3 observations cover about50 sq. arcmin in the GOODS-South field as a part of the WFC3 Early ReleaseScience program. These LBGs at z=1-3 are selected using dropout selectioncriteria similar to high redshift LBGs. The deep multi-band photometry in thisfield is used to identify best-fit SED models, from which we infer thefollowing results: (1) the photometric redshift estimate of these dropoutselected LBGs is accurate to within few percent; (2) the UV spectral slope(beta) is redder than at high redshift (z>3), where LBGs are less dusty; (3) onaverage, LBGs at z=1-3 are massive, dustier and more highly star-forming,compared to LBGs at higher redshifts with similar luminosities(0.1L*<~L<~2.5L*), though their median values are similar within 1-sigmauncertainties. This could imply that identical dropout selection technique, atall redshifts, find physically similar galaxies; and (4) stellar masses ofthese LBGs are directly proportional to their UV luminosities with alogarithmic slope of ~0.46, and star-formation rates are proportional to theirstellar masses with a logarithmic slope of ~0.90. These relations hold true ---within luminosities probed in this study --- for LBGs from z~1.5 to 5. Thestar-forming galaxies selected using other color-based techniques show similarcorrelations at z~2, but to avoid any selection biases, and for directcomparison with LBGs at z>3, a true Lyman break selection at z~2 is essential.The future HST UV surveys, both wider and deeper, covering a large luminosityrange are important to better understand LBG properties, and their evolution.

Stellar Populations of Lyman Break Galaxies at z=1-3 in the HST/WFC3 Early Release Science Observations