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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 606639.0, MPI für Astronomie / Publikationen_mpia
Extreme emission-line galaxies in CANDELS: broadband-selected, starbursting dwarf galaxies at z > 1
Authors:van der Wel, A.; Straughn, A. N.; Rix, H. W.; Finkelstein, S. L.; Koekemoer, A. M.; Weiner, B. J.; Wuyts, S.; Bell, E. F.; Faber, S. M.; Trump, J. R.; Koo, D. C.; Ferguson, H. C.; Scarlata, C.; Hathi, N. P.; Dunlop, J. S.; Newman, J. A.; Dickinson, M.; Jahnke, K.; Salmon, B. W.; de Mello, D. F.; Kocevski, D. D.; Lai, K.; Grogin, N. A.; Rodney, S. A.; Guo, Y.; McGrath, E. J.; Lee, K. S.; Barro, G.; Huang, K. H.; Riess, A. G.; Ashby, M. L. N.; Willner, S. P.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:The Astrophysical Journal
Issue / Number:2
Audience:Not Specified
Abstract / Description: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 imaging from Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3). Sixty-nine EELG candidates are selected by the large contribution of exceptionally bright emission lines to their near-infrared broadband magnitudes. Supported by spectroscopic confirmation of strong [O III] emission lines—with rest-frame equivalent widths ~1000 Å—in the four candidates that have HST/WFC3 grism observations, we conclude that these objects are galaxies with ~108 M ☉ in stellar mass, undergoing an enormous starburst phase with M_*/\dot{M}_* 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 comoving number density (3.7 × 10–4 Mpc–3) can produce in ~4 Gyr much of the stellar mass density that is presently contained in 108-109 M ☉ 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.
Free Keywords:galaxies: dwarf; galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: starburst
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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