Poster Presentation

Searching for obscured AGNs in deep and wide multi-wavelength imaging datasets

Author(s): Bovornpratch Vijarnwannaluk Masayuki Akiyama

Presenter: Bovornpratch Vijarnwannaluk (Tohoku University)

The properties of obscured Active galactic nuclei (AGNs) at high redshift are less understood compared to the obscured AGN population in the local universe. The difficulty in identifying accretion activity at high-redshift comes from the faintness of the AGN signatures and their similarity with galaxies with no ongoing accretion in the nuclear region due to obscuration. X-ray emission is a ubiquitous signature of AGN activity and thanks to the strong penetrating power of X-ray emission against obscuration it is possible to identify the population of obscured AGNs. In this work, we search for obscured AGNs at high redshift (z>2) using the XMM-SERVS pointsource catalog (Chen et al. 2018) which is a large X-ray dataset between 0.5-10 keV. Photometric measurements of the optical/IR counterpart was measured from deep optical/IR imaging datasets using prior-based covolved photometry in order to mitigate the effects of blending due to the large PSF-size in the mid-infrared datasets. Redshift information was obtained from public spectroscopic surveys and photometric redshift was derived for AGNs without spectroscopic redshift measurements. Here, we present the current status and results of the ongoing effort to search for high-z obscured AGNs.