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arXiv · 1206.6116

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

N. P. Hathi·S. H. Cohen·R. E. Ryan Jr·S. L. Finkelstein·P. J. McCarthy·R. A. Windhorst·H. Yan·A. M. Koekemoer·M. J. Rutkowski·R. W. O'Connell·A. N. Straughn·B. Balick·H. E. Bond·D. Calzetti·M. J. Disney·M. A. Dopita·J. A. Frogel·D. N. B. Hall·J. A. Holtzman·R. A. Kimble·F. Paresce·A. Saha·J. I. Silk·J. T. Trauger·A. R. Walker·B. C. Whitmore·E. T. Young
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Abstract

We analyze the spectral energy distributions (SEDs) of Lyman break galaxies (LBGs) at z=1-3 selected using the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) UVIS channel filters. These HST/WFC3 observations cover about 50 sq. arcmin in the GOODS-South field as a part of the WFC3 Early Release Science program. These LBGs at z=1-3 are selected using dropout selection criteria similar to high redshift LBGs. The deep multi-band photometry in this field is used to identify best-fit SED models, from which we infer the following results: (1) the photometric redshift estimate of these dropout selected 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) on average, 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-sigma uncertainties. This could imply that identical dropout selection technique, at all redshifts, find physically similar galaxies; and (4) stellar masses of these LBGs are directly proportional to their UV luminosities with a logarithmic slope of ~0.46, and star-formation rates are proportional to their stellar 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. The star-forming galaxies selected using other color-based techniques show similar correlations at z~2, but to avoid any selection biases, and for direct comparison 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 luminosity range are important to better understand LBG properties, and their evolution.

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N. P. Hathi, S. H. Cohen, R. E. Ryan Jr, S. L. Finkelstein, P. J. McCarthy, R. A. Windhorst, H. Yan, A. M. Koekemoer, M. J. Rutkowski, R. W. O'Connell, A. N. Straughn, B. Balick, H. E. Bond, D. Calzetti, M. J. Disney, M. A. Dopita, J. A. Frogel, D. N. B. Hall, J. A. Holtzman, R. A. Kimble, F. Paresce, A. Saha, J. I. Silk, J. T. Trauger, A. R. Walker, B. C. Whitmore, E. T. Young. 2013-01-17. Stellar Populations of Lyman Break Galaxies at z=1-3 in the HST/WFC3 Early Release Science Observations. https://doi.org/10.1088/0004-637x%2F765%2F2%2F88

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