Demography of high redshift AGN
Fabrizio Fiore (INAF-OAR), Simonetta Puccetti (ASI SDC), Smita Mathur, (Ohio State University)
TL;DR
This paper reviews the search for high-redshift AGN using deep X-ray observations, challenges recent detections, and predicts future survey capabilities with upcoming missions like Athena, WFXT, and Super-Chandra.
Contribution
It provides a comprehensive analysis of high-z AGN detections, refutes previous claims of positive detection, and offers predictions for future X-ray surveys with new mission concepts.
Findings
No confirmation of previous z~6 galaxy signals in stacked Chandra images.
Number counts of z>3 X-ray sources derived from multiple surveys.
Predictions for detection capabilities of future X-ray missions.
Abstract
High redshift AGN holds the key to understand the early structure formation and to probe the Universe during its infancy. We review the latest searches for high-z AGN in the deepest X-ray field so far, the Chandra Deep Field South (CDFS) 4 Msecond exposure. We do not confirm the positive detection of a signal in the stacked Chandra images at the position of z~6 galaxies recently reported by Treister and collaborators. We present z>3 X-ray sources number counts in the 0.5-2 keV band obtained joining CDFS faint detections with Chandra-COSMOS and XMM-COSMOS detections. We use these number counts to make predictions for surveys with three mission concepts: Athena, WFXT and a Super-Chandra.
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