Takuma NISHIDUKA
(Master' course of astronomy , Graduate school of Science , Tohoku University )
Low-mass galaxies are the most numerous objects in the universe at all epoch and provide unique tracer of understanding for evolution of galaxies. Among them , extreme emission line galaxies(EELGs) are objects of interest especially , and has low mass and very high specific star formation rate(sSFR). And environment effects of local high starforming galaxies are studied in previous work , but these of EELG such like BCD and dwarf galaxies are fully studied yet.
Among key observations in "COSMOS20 project" , We selected 3097 EELG by using 6 broad band filters and 12 intermediate-band filters obtained by Subaru Suprime-Cam. Among those EELG,we focus on 2340 [OIII] EELGs which is the most detected ,and estimate local surface density in order to find environment effect and large scale structure of [OIII] EELG by using auto correlation function(ACF).
We found there is no characteristic deferences between [OIII] environment of EELG and that of non-emitter. We also estimate environment of [OIII] EELG with respect to each Equivalent width of [OIII] EELG and find no prominent difference between them. We found significant deviation from power law at small scale in the ACF of [OIII] EELG .We also discuss these function of EELG in COSMOS with previous work in SDSS or other survey.