Constraining the X-ray AGN halo occupation distribution: implications for eROSITA
Priyanka Singh, Alexandre Refregier, Subhabrata Majumdar, Biman B., Nath
TL;DR
This paper models the X-ray emission from AGNs using the luminosity function and halo occupation distribution, predicting auto-correlation spectra for eROSITA and exploring how these can constrain AGN distribution and evolution.
Contribution
It introduces a halo model for AGN X-ray emission based on XLF and HOD, and forecasts its application in constraining AGN properties with eROSITA data.
Findings
Clustering dominates over Poisson at large scales (l<1000).
Auto-correlation and cross-correlation spectra can constrain HOD parameters.
Power spectrum of unresolved AGNs helps distinguish diffuse gas emission.
Abstract
The X-ray emission from active galactic nucleus (AGN) is a major component of extragalactic X-ray sky. In this paper, we use the X-ray luminosity function (XLF) and halo occupation distribution (HOD) formalism to construct a halo model for the X-ray emission from AGNs. Verifying that the two inputs (XLF and HOD) are in agreement with each other, we compute the auto-correlation power spectrum in the soft X-ray band (0.5-2 keV) due to the AGNs potentially resolved by eROSITA (extended ROentgen Survey with an Imaging Telescope Array) mission and explore the redshift and mass dependence of the power spectrum. Studying the relative contribution of the Poisson and the clustering terms to the total power, we find that at multipoles (i.e. large scales), the clustering term is larger than the Poisson term. We also forecast the potential of X-ray auto-correlation power spectrum…
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