S21A0069
S21A0069
We propose to conduct multiple comprehensive studies for local extremely metal-poor galaxies (EMPGs) with 1-10% solar oxygen abundance with deep FOCAS IFU and supplementary Y-band spectra. Although EMPGs are key for understanding the early galaxy formation and universe, large systematic surveys with 8m-class telescopes are missing. Having successful results of Extremely Metal-Poor Representatives Explored by the Subaru Survey (EMPRESS), we will extend the EMPRESS project by the FOCAS IFU and Y-band spectroscopy that provide optical strong lines (HΞ±, HΞ², [Oiii]5007, [Nii]6584) over the 3D data cube and weak emission lines including [Feiii]4658, Heii4686, and Hei10830 at the EMPG luminosity peaks. Our goals are 1) revealing dynamics of EMPGs for questions whether a rotation exists with rich gas, and which EMPGs are independent galaxies or metal poor Hii regions, 2) characterizing chemical and ionization properties including (Fe/O) for supernova (SN) yields and delay time of Type Ia SNe and BPT diagram for distribution of metallicities and ionization parameters, and 3) determining primordial 4He abundance Yp and the number of neutrino families testing for new particles such as sterile neutrinos and the thermal states before the Big Bang nucleosynthesis.
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