The next-generation X-ray galaxy survey with eROSITA

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https://academic.oup.com/mnras/article-abstract/498/2/1651/5891250?redirectedFrom=fulltext

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https://doi.org/10.1093/mnras/staa2343
 http://hdl.handle.net/11603/20607

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection
UMBC Physics Department

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2020-08-11

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journal articles
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Antara R Basu-Zych et al., The next-generation X-ray galaxy survey with eROSITA, Monthly Notices of the Royal Astronomical Society, Volume 498, Issue 2, October 2020, Pages 1651–1667, https://doi.org/10.1093/mnras/staa2343

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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Abstract

eROSITA, launched on 2019 July 13, will be completing the first all-sky survey in the soft and medium X-ray band in nearly three decades. This 4-yr survey, finishing in late 2023, will present a rich legacy for the entire astrophysics community and complement upcoming multiwavelength surveys (with, e.g. the Large Synoptic Survey Telescope and the Dark Energy Survey). Besides the major scientific aim to study active galactic nuclei (AGNs) and galaxy clusters, eROSITAwill contribute significantly to X-ray studies of normal (i.e. not AGN) galaxies. Starting from multiwavelength catalogues, we measure star formation rates and stellar masses for 60 212 galaxies constrained to distances of 50–200 Mpc. We chose this distance range to focus on the relatively unexplored volume outside the local Universe, where galaxies will be largely spatially unresolved and probe a range of X-ray luminosities that overlap with the low luminosity and/or highly obscured AGN population. We use the most recent X-ray scaling relations as well as the on-orbit eROSITA instrument performance to predict the X-ray emission from XRBs and diffuse hot gas and to perform both an analytic prediction and an end-to-end simulation using the mission simulation software, SIXTE. We consider potential contributions from hidden AGN and comment on the impact of normal galaxies on the measurement of the faint end of the AGN luminosity function. We predict that the eROSITA 4-yr survey, will detect ≳15 000 galaxies (3σ significance) at 50–200 Mpc, which is ∼100 × more normal galaxies than detected in any X-ray survey to date