Poster Presentation
A new wide exploration of high-z radio galaxies with the gzK selection
Presenter: Seira Kobayashi (Ehime university)
Understanding the role of radio jets at high-z is essential to study the AGN feedback, which is considered one of the keys of galaxy formation and evolution. However, statistically-large samples of high-z radio galaxies (HzRGs) have not been constructed so far, due to their rarity and technical limitations. In this work, we employed the gzK selection method that identifies both star-forming and passive galaxies in the cosmic noon. This approach enables us to carry out a comprehensive study of HzRGs at z~2. We identified a total of 88 star-forming RGs (sgzK-RGs) and 18 passive RGs (pgzK-RGs) by cross-matching optical data from Subaru/HSC, near-infrared data from VISTA VIKING, and radio data from VLA FIRST, utilizing the gzK selection criteria. From the SED fitting, we found that the sgzK-RGs are on the main sequence (MS) of star-forming galaxies, and are in good agreement with investigation in the previous literature. On the other hand, our pgzK-RGs exhibit a deviation of ~1 dex below the MS. This suggests that the gzK selection method can uncover a new population of RGs in the high-z Universe, which were previously unexplored.
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