Abstract Details
| Name: Priyanka Singh Affiliation: Raman Research Institute Conference ID: ASI2017_482 Title : Constraints on the relation between the X-ray AGNs and host dark matter halo: potential role of eROSITA Authors and Co-Authors : Alexandre Refregier (ETH, Zurich), Subhabrata Majumdar (TIFR, Mumbai), Biman B. Nath (RRI, Bangalore) Abstract Type : Oral Abstract Category : General Relativity and Cosmology Abstract : The active galactic nucleus (AGN) is a dominant contributor to the extragalactic X-ray sky. It is essential to model the X-ray emission from the AGNs carefully to extract the X-ray signal from other sources such as the diffuse, hot gas present in the form of intracluster and circumgalactic medium in the clusters and galaxies, respectively. We estimate the auto power spectrum due to the X-ray AGNs potentially resolved by eROSITA mission in the soft X-ray band. There are two main ingredients required to compute the X-ray AGN power spectrum: 1) AGN X-ray luminosity function, which describes the luminosity dependence of the AGNs and 2) the halo occupation distribution (HOD) model, which describes the halo mass dependence of the AGNs. We have verified that these two inputs are in agreement with the AGN observations as well as with each other in a wide range of redshift (especially at z ∼ 0.5 − 3.5). We forecast the constraints on the HOD model parameters using X-ray auto and X-ray-lensing cross power spectra with eROSITA and eROSITA-LSST survey combination, respectively. We have found that the uncertainties in the HOD model parameters can be reduced by an order of magnitude by including lensing in the analysis. |