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 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*/M *;̇of only ∼15Myr. 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 ∼4Gyr much of the stellar mass density that is presently contained in 10 8-109 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.
Original language | English (US) |
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Article number | 111 |
Journal | Astrophysical Journal |
Volume | 742 |
Issue number | 2 |
DOIs | |
State | Published - Dec 1 2011 |
Keywords
- galaxies: dwarf
- galaxies: evolution
- galaxies: formation
- galaxies: high-redshift
- galaxies: starburst
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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Extreme emission-line galaxies in CANDELS
Van, D. W. A. (Creator), Straughn, A. N. (Creator), Rix, H.-W. (Creator), Finkelstein, S. L. (Creator), Koekemoer, A. M. (Creator), Weiner, B. J. (Creator), Wuyts, S. (Creator), Bell, E. F. (Creator), Faber, S. M. (Creator), Trump, J. R. (Creator), Koo, D. C. (Creator), Ferguson, H. C. (Creator), Scarlata, C. (Creator), Hathi, N. P. (Creator), Dunlop, J. S. (Creator), Newman, J. A. (Creator), Dickinson, M. (Creator), Jahnke, K. (Creator), Salmon, B. W. (Creator), De, M. D. F. (Creator), Kocevski, D. D. (Creator), Lai, K. (Creator), Grogin, N. A. (Creator), Rodney, S. A. (Creator), Guo, Y. (Creator), McGrath, E. J. (Creator), Lee, K.-S. (Creator), Barro, G. (Creator), Huang, K.-H. (Creator), Riess, A. G. (Creator), Ashby, M. L. N. (Contributor) & Willner, S. P. (Creator), Centre de Donnees Strasbourg (CDS), 2013
DOI: 10.26093/cds/vizier.17420111, https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/742/111
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