SRGz: building an optical cross-match model for the X-ray SRG/eROSITA sources using the Lockman Hole data

2022/03/22 by M. I. Belvedersky, A. V. Meshcheryakov, Belvedersky, M. I. +5
Physics and Astronomy · #Advanced X-ray Imaging Techniques #Astrophysical Phenomena and Observations #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Pulsars and Gravitational Waves Research

paper · pdf · doi:10.48550/arxiv.2203.11531

openalex publication_date 2022/03/22 · openalex created_date 2022/04/03 · openalex updated_date 2026/07/28

Abstract

We present a probabilistic model built for the optical cross-match between the SRG/eROSITA X-ray sources and photometric data from the DESI Legacy Imaging Surveys. The model relies both on positional and photometric information on optical objects nearby X-ray sources and allows performing selection with precision and recall ≈94% (for F_{\rm X,0.5-2}>10^-14 erg/s/cm²). With this model, we calibrated positional error of the SRG/eROSITA sources detected in the Lockman Hole: σ_{\rm corr} = 0.87√ σ_{\rm det}^2.53 + 1.12². The model will become a part of the SRGz system for data analysis of the X-ray data obtained from the all-sky SRG/eROSITA survey.

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