文献类型  预印版论文

标    题  EXTREME EMISSION LINE GALAXIES IN CANDELS: BROAD-BAND SELECTED, STAR-BURSTING DWARF GALAXIES AT Z > 1

著    者  A. van der Wel; A. N. Straughn; H.-W. Rix

机    构  Max-Planck Institut fur Astronomie; Astrophysics Science Pision, Goddard Space Flight Center

年        2011

地    域  Heidelberg, Germany

描    述  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? A ...More– in the four candidates that have HST/WFC3 grism observations, we conclude that these objects are galaxies with ～ 108M⊙ in stellar mass, undergoing an enormous starburst phase with M?/˙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 inPidual star formation rates and the co-moving number density (3.7×10?4Mpc?3) can produce in ～4 Gyr much of the stellar mass density that is presently contained in 108? 109M⊙ 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.

全文链接：http://218.246.35.11/fs/spm/20121102/PHYS11111503_40601505.PDF