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arXiv · 1107.5256

Extreme Emission Line Galaxies in CANDELS: Broad-Band Selected, Star-Bursting Dwarf Galaxies at z>1

A. van der Wel·A. N. Straughn·H. -W. Rix·S. L. Finkelstein·A. M. Koekemoer·B. J. Weiner·S. Wuyts·E. F. Bell·S. M. Faber·J. R. Trump·D. C. Koo·H. C. Ferguson·C. Scarlata·N. P. Hathi·J. S. Dunlop·J. A. Newman·M. Dickinson·K. Jahnke·B. W. Salmon·D. F. de Mello·D. D. Kocevski·K. Lai·N. A . Grogin·S. A. Rodney·Yicheng Guo·E. G. McGrath·K. -S. Lee·G. Barro·K. -H. Huang·A. G. Riess·M. L. N. Ashby·S. P. Willner
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Abstract

We identify an abundant population of extreme emission line galaxies (EELGs) at redshift z~1.7 in the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS) imaging from Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3). 69 EELG candidates are selected by the large contribution of exceptionally bright emission lines to their near-infrared broad-band magnitudes. Supported by spectroscopic confirmation of strong [OIII] emission lines -- with rest-frame equivalent widths ~1000\AA -- in the four candidates that have HST/WFC3 grism observations, we conclude that these objects are galaxies with 10^8 Msol in stellar mass, undergoing an enormous starburst phase with M_*/(dM_*/dt) of only ~15 Myr. These bursts may cause outflows that are strong enough to produce cored dark matter profiles in low-mass galaxies. The individual star formation rates and the co-moving number density (3.7x10^-4 Mpc^-3) can produce in ~4 Gyr much of the stellar mass density that is presently contained in 10^8-10^9 Msol dwarf galaxies. Therefore, our observations provide a strong indication that many or even most of the stars in present-day dwarf galaxies formed in strong, short-lived bursts, mostly at z>1.

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A. van der Wel, A. N. Straughn, H. -W. Rix, S. L. Finkelstein, A. M. Koekemoer, B. J. Weiner, S. Wuyts, E. F. Bell, S. M. Faber, J. R. Trump, D. C. Koo, H. C. Ferguson, C. Scarlata, N. P. Hathi, J. S. Dunlop, J. A. Newman, M. Dickinson, K. Jahnke, B. W. Salmon, D. F. de Mello, D. D. Kocevski, K. Lai, N. A . Grogin, S. A. Rodney, Yicheng Guo, E. G. McGrath, K. -S. Lee, G. Barro, K. -H. Huang, A. G. Riess, M. L. N. Ashby, S. P. Willner. 2011-07-26. Extreme Emission Line Galaxies in CANDELS: Broad-Band Selected, Star-Bursting Dwarf Galaxies at z>1. https://doi.org/10.1088/0004-637x/742/2/111

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