PHANGS-ALMA：利用ALMA成图以角秒分辨率观测邻近恒星形成的星系
PHANGS-ALMA: Arcsecond CO(2-1) Imaging of Nearby Star-forming Galaxies
People have been realizing that the intrinsic distribution of CO emission in galaxies is strongly clumped on scales of giant molecular clouds (GMCs), which is much smaller than the kiloparsec resolution of the last generation of CO mapping surveys, e.g., CARMA-EDGE in the last talk. In other words, high angular resolution is urgently needed: (1) to verify current models of star formation on individual GMCs; (2) to give access to the temporal domain of interstellar processes, building a picture of the evolutionary sequence of star formation. The dramatically faster survey speed of ALMA provides the first opportunity of surveying a large, representative sample of local galaxies at a high angular resolution and sensitivity. PHANGS–ALMA applies these capabilities to image CO(2-1) emission across almost all massive, nearby, southern, star-forming galaxies with resolution of ~1" (i.e., ~100 pc), and sensitivity of 100,000 solar mass. These characteristics make PHANGS–ALMA ideally suited to measure the demographics, motions, and organization of molecular gas (clouds) in galaxies. In this talk, I'll give a detailed introduction towards project PHANGS-ALMA, including its source selection, key science goals, and recent important publications. Since CSST is the next generation of optical space telescope, I'll also show some prospects of the synergy between CSST and ALMA about the multi-phase of ISM.
