Gas and star formation at sub-100 pc scales in lensed hyper-luminous SMGs at Cosmic Noon

I will present the results of the ALMA twenty-six arcmin^2 survey of GOODS-S at one millimeter (ASAGAO). ASAGAO is a 1.2mm deep and wide area (26 arcmin^2) survey on a contiguous field. By combining with archival data in the GOODS-South field, we obtained a deeper map in the same region (1sigma ~ 30-60 uJy/beam), providing the largest sample of sources (45 sources at 4.5sigma) among ALMA blank-field surveys. Multi-wavelength analysis of the ASAGAO sources found that the median redshift is 2.4 and they are located on the massive end of the main sequence. ALMA-detected K-band sources exhibit systematically larger IR excess (IRX) compared to ALMA-undetected sources, suggesting that they have different dust properties such as dust distributions or compositions. We created IR luminosity functions (LFs) at z = 1-3, and constrain the faintest luminosity of the LFs at 2.0 < z < 3.0. The LFs are consistent with previous results based on other ALMA and SCUBA-2 observations, which suggests a positive luminosity evolution and negative density evolution with increasing redshift. We found sources without counterparts in deep H and K-band images, whose SEDs suggest z ~> 3-5. Their contribution to the cosmic SFR density would be consistent with bright SMGs, demonstrating the importance of ALMA unbiased survey for detecting dust-obscured star formation activities in the early universe, which have been missed in previous optical/NIR surveys.