Extreme Emission Line Galaxies in CANDELS: Broad-Band Selected, Star-Bursting Dwarf Galaxies at z>1
| Autor: | 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. G., Lee, K. -S., Barro, G., Huang, K. -H., Riess, A. G., Ashby, M. L. N., Willner, S. P. |
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| Rok vydání: | 2011 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0004-637X/742/2/111 |
| Popis: | 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. Comment: accepted for publication in ApJ; 10 pages; 6 figures; 1 table |
| Databáze: | arXiv |
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