Discovering extremely compact and metal-poor, star-forming dwarf galaxies out to z ~ 0.9 in the VIMOS Ultra-Deep Survey

摘要

We report the discovery of 31 low-luminosity (?14.5 ? MAB(B) ? ?18.8), extreme emission line galaxies (EELGs) at 0.2 ? z ? 0.9 identified by their unusually high rest-frame equivalent widths (100?≤?EW[O?iii]?≤?1700 ?) as part of the VIMOS Ultra Deep Survey (VUDS). VIMOS optical spectra of unprecedented sensitivity (IAB?~?25?mag) along with multiwavelength photometry and HST imaging are used to investigate spectrophotometric properties of this unique sample and to explore, for the first time, the very low stellar mass end (M? ? 108M⊙) of the luminosity-metallicity (LZR) and mass-metallicity (MZR) relations at z < 1. Characterized by their extreme compactness (R50