Poster Presentation

Investigating the Host Galaxy of Active Galactic Nuclei with S3Fit

Author(s): Bovornpratch Vijarnwannaluk, Xiaoyang Chen

Presenter: Bovornpratch Vijarnwannaluk (ASIAA)

Spectral datasets have had a long history in studies of Active galactic nuclei, both from the perspective of the Supermassive black hole and the host galaxy that hosts the AGN. However, to investigate AGN and the host galaxy properties, the AGN and host galaxy emission need to be decomposed from each other. It is expected that PFS will deliver large quantities of high-S/N spectra of AGN thanks to the large multiplexing capability of PFS, broad wavelength coverage, and high sensitivity thanks to the Subaru Telescope's large collecting area. Moreover, the multiwavelength approach for AGN target selection, which encompasses multiple types of AGN, will provide a large sample of AGN host galaxies in various levels of star formation and local environment. Recently, Chen et al. 2025 presented S3FIT, which is a recently developed spectral-photometric SED fitting code geared towards AGN host galaxies. S3FIT incorporates more realistic AGN template models (e.g., SKIRTOR) into its models in addition to the ability to extract nonparametric star formation histories. Here, we show our preliminary validation of the code S3Fit using sources in the LEGA-C Survey, which also have spectra observed by the PFS-Spectrograph in the COSMOS Field.