Oral Presentation

The Initial Results from the Subaru PFS Open-Use data: Spectroscopic Identification of AGNs in the EGS Field

Author(s): Atsushi Hoshi(Tohoku Univ./ISAS), Toru Yamada(ISAS), Tohru Nagao(Ehime Univ.), and Mitsuru Kokubo(NAOJ)

Presenter: Atsushi Hoshi (Tohoku University / ISAS JAXA)

The Subaru Prime Focus Spectrograph (PFS) is a newly commissioned, wide-field (1.25 deg²), multi-object spectrograph capable of observing up to 2400 targets simultaneously across a wavelength range of 380–1260 nm with a spectral resolution of R ~ 3000. These capabilities are particularly powerful for studying low-luminosity active galactic nuclei (AGNs), providing detailed measurements of host stellar absorption features and emission lines originating from the accreting supermassive black hole (SMBH) simultaneously. We present the initial results from the open-use PFS program (S25A-096QN) targeting the X-ray sources in the Extended Groth Strip (EGS) field, one of the deepest Chandra imaging survey regions and comparable to the main survey fields of the PFS Strategic Survey Program (SSP). We obtained 2–5 hour integrations for - 800 X-ray sources and successfully constructed robust 189 AGN sample based on their emission line and spectral features. Our observations extend AGN identification to fainter X-ray fluxes compared to the objects in the COSMOS field, allowing robust spectroscopic classification and redshift determination for sources that were previously inaccessible with ground-based facilities. We also plan to represent the properties of 10 post-starburst AGNs identified in the EGS sample, characterized by strong Balmer absorption features and the broad H-alpha line.