Poster Presentation

All-sky AGN selection with SPHEREx for PFS follow up

Author(s): Yuka Yamada (University of Tokyo)

Presenter: Yuka Yamada (University of Tokyo)

SPHEREx will provide the first all-sky near-infrared spectro-photometric survey (0.75–5 µm), enabling target selection for active galactic nucleus (AGN) using emission lines and spectral shapes over a wide redshift range. We investigate how an Hα-flux-limited selection with SPHEREx-like sensitivity shapes the AGN population as a function of redshift. Using simulated galaxy spectral energy distributions, we compare the Hα luminosity functions of AGN-dominated systems and star-forming galaxies and quantify the resulting AGN fraction. We find that while both populations contribute comparably at z<1, the Hα-detected sample becomes strongly AGN-dominated at z>1. These results demonstrate SPHEREx’s unique capability to define a redshift-dependent AGN selection function, providing a powerful foundation for Subaru/PFS follow-up studies of supermassive black hole growth.