Combining XMM and HSC to select large samples of High Redshift z>3.5 AGN
Abstract
The detection of X-ray AGN at high redshifts requires surveys covering large areas in combination with deep optical and near-IR data to identify their optical counterparts. XMM provides ideal samples for such studies owing to the large sky area covered, its excellent sensitivity in combination with the available very deep optical data from the Subaru HSC (i∼26) and the DES surveys. We have conducted a proof of concept study in the XMM/XXL North 25 deg2, area finding a sample of high redshift AGN between z=3.5 to 5.35 applying dropout techniques. The redshifts are confirmed with either spectroscopy or excellent quality SED photometric redshifts. The XMM surveys are entirely complementary to eROSITA as they probe much fainter fluxes and optical magnitudes corresponding to lower luminosities at a given redshift. We report on the application of these techniques to larger areas with available HSC data. Finally, we report first results from the ∼150 square degrees DES/XMM survey in the southern hemisphere.
- Publication:
-
44th COSPAR Scientific Assembly. Held 16-24 July
- Pub Date:
- July 2022
- Bibcode:
- 2022cosp...44.1813G