談話会
Colloquium

Bovornpratch Vijarnwannaluk (Tohoku U.)
Searching for obscured active galactic nuclei in wide and deep multi-wavelength survey
It is well known that black hole growth also occurs behind obscuration. Recent observational results imply that the fraction of obscured black hole growth increases towards high redshift. Searching for obscured active galactic nuclei at high-redshift (z>1) is not trivial due to their faintness and their similarity to galaxies without AGN activity. We search for obscured AGNs by crossmatching between X- ray point source catalogs and deep optical/IR imaging datasets. A multi-band PSF convolved photometric catalog was constructed from deep imaging datasets in the HSC-DEEP XMM-SERVS field containing 12 photometric bands and crossmatched with XMM-SERVS Point source catalog. Thanks to the strong penetrating power of hard x-rays (>10kev), obscured AGNs can be selected using the optical/IR colors and morphology. 1402 AGNs were selected at redshift 1-3 using color selection and 570 obscured AGN candidates were found with Lx,2-10=43-45. A broad range of AGN luminosity was obtained thanks to the larger survey area including rare luminous quasars and typical AGNs in this redshift range. In this study, the photometric redshift and stellar mass was derived using SED fitting. In this presentation, the AGN selection method, results of the AGN selection, and preliminary characterization of the AGN and host galaxy properties will be presented as well as the next step in this study to examine the obscure growth of AGNs at high redshift.