S22A0090
S22A0090
This is the "fourth" trial of our high-score programs which were totally lost by weather, technical problem, and COVID-19 in S18A-S20A. Clusters of galaxies are statistical objects by nature, and investigating these systems over cosmic times will require a large sample at each epoch and free from selection bias. With such motivations, we have been conducting a hybrid cluster search program with HSC on Subaru named HSC2, which not only searches for passively evolving red sequence galaxies with broad-band colours but also line emitting star forming galaxies with narrow-band filters. During the course of this survey, we have identified the new class of objects, namely, "blue-dominated young clusters" without developed red-sequence. As a pilot spectroscopic follow-up program, we aim to confirm 4 such new systems at z=0.84 with FOCAS as well as 2 normal dual (blue+red) clusters for comparison, and investigate the properties of galaxies therein such as star formation rates, metallicities and ionization states. Taking this opportunity of re-submission, we also add two new targets at z=1.47 and 1.61 that we recently discovered. We will unveil the intrinsic scatter of cluster/galaxy properties depending on the evolutionary phases of clusters even at the same cosmic times.
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