Details

Autor(en) / Beteiligte

• 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, Yicheng
• McGrath, E. J
• Lee, K.-S
• Barro, G
• Huang, K.-H
• Riess, A. G
• Ashby, M. L. N
• Willner, S. P

Titel

Extreme Emission-line Galaxies in CANDELS: Broadband-selected, Starbursting Dwarf Galaxies at z > 1

Ist Teil von

• The Astrophysical journal, 2011-12, Vol.742 (2), p.111-jQuery1323901295676='48'

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2011

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 A--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 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 X 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.