Insights of environmental effect in high-z galaxy evolution from radio and (sub)mm perspectives

<p>An intensive star formation in high-z (proto)clusters is predicted by galaxy archaeol- ogy and simulations, and there are increasing number of candidate protoclusters at high redshift. The detailed picture, nevertheless, has been hampered by the coarse resolution of (sub)mm regime (mostly probed by a single dish) that is an ideal tool to address ob- scured star formation within a galaxy. This talk, I present our recent results from ALMA and JVLA observations both at sub-arcsec resolution, targeting star-forming galaxies as- sociated to a protocluster which is placed at the peak epoch of galaxy formation. We pin-down radio and dust continuum emission at 10 cm and 1.1 mm, respectively, and investigate their star forming activity, relation to AGN activity (if any), and kinematics with the help of molecular (CO) line detections from ALMA. The massive (> 4 × 1e10 M⊙) star forming populations associated to a protocluster z = 2.49 are generally detected from the observations. The rich data sets allow in-depth studies of the protocluster, addressing the importance of deep and high resolution imaging in multi-band data.