The SRG/eROSITA All-Sky Survey: Dark Energy Survey year 3 weak gravitational lensing by eRASS1 selected galaxy clusters 2024 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 687, article id A178Article in journal (Refereed) Published

Abstract [en]

Context. Number counts of galaxy clusters across redshift are a powerful cosmological probe if a precise and accurate reconstruction of the underlying mass distribution is performed - a challenge called mass calibration. With the advent of wide and deep photometric surveys, weak gravitational lensing (WL) by clusters has become the method of choice for this measurement. Aims. We measured and validated the WL signature in the shape of galaxies observed in the first three years of the Dark Energy Survey (DES Y3) caused by galaxy clusters and groups selected in the first all-sky survey performed by SRG (Spectrum Roentgen Gamma)/eROSITA (eRASS1). These data were then used to determine the scaling between the X-ray photon count rate of the clusters and their halo mass and redshift. Methods. We empirically determined the degree of cluster member contamination in our background source sample. The individual cluster shear profiles were then analyzed with a Bayesian population model that self-consistently accounts for the lens sample selection and contamination and includes marginalization over a host of instrumental and astrophysical systematics. To quantify the accuracy of the mass extraction of that model, we performed mass measurements on mock cluster catalogs with realistic synthetic shear profiles. This allowed us to establish that hydrodynamical modeling uncertainties at low lens redshifts (z < 0.6) are the dominant systematic limitation. At high lens redshift, the uncertainties of the sources' photometric redshift calibration dominate. Results. With regard to the X-ray count rate to halo mass relation, we determined its amplitude, its mass trend, the redshift evolution of the mass trend, the deviation from self-similar redshift evolution, and the intrinsic scatter around this relation. Conclusions. The mass calibration analysis performed here sets the stage for a joint analysis with the number counts of eRASS1 clusters to constrain a host of cosmological parameters. We demonstrate that WL mass calibration of galaxy clusters can be performed successfully with source galaxies whose calibration was performed primarily for cosmic shear experiments, opening the way for the cluster cosmological exploitation of future optical and NIR surveys like Euclid and LSST.

Place, publisher, year, edition, pages

EDP SCIENCES S A , 2024. Vol. 687, article id A178

Keywords [en]

gravitational lensing: weak; large-scale structure of Universe; X-rays: galaxies: clusters

National Category

Astronomy, Astrophysics and Cosmology

Identifiers

URN: urn:nbn:se:liu:diva-208688DOI: 10.1051/0004-6361/202348615ISI: 001287298800001OAI: oai:DiVA.org:liu-208688DiVA, id: diva2:1907427

Note

Funding Agencies|soft X-ray instrument aboard SRG, a joint Russian-German science mission; Russian Space Agency (Roskosmos); Deutsches Zentrum fur Luft und Raumfahrt (DLR); Max Planck Institute for Extraterrestrial Physics (MPE); University of Hamburg Observatory; Leibniz Institute for Astrophysics Potsdam (AIP); DLR; Max Planck Society; Argelander Institute for Astronomy of the University of Bonn; German eROSITA consortium; U.S. Department of Energy; U.S. National Science Foundation; Ministry of Science and Education of Spain; Council of the United Kingdom; Higher Education Funding Council for England; National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign; Center for Cosmology and Astro-Particle Physics at the Ohio State University; Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University; Financiadora de Estudos e Projetos; Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico; Deutsche Forschungsgemeinschaft; Collaborating Institutions in the Dark Energy Survey; University of California at Santa Cruz; University of Cambridge, Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas-Madrid; DES-Brazil Consortium; University of Edinburgh; Eidgenossische Technische Hochschule (ETH) Zurich; Institut de Ciencies de l'Espai (IEEC/CSIC); OzDES Membership Consortium; University of Portsmouth; Texas AM University; Association of Universities for Research in Astronomy (AURA); National Science Foundation; European Research Council (ERC) Consolidator Grant under the European Union [101002585]; COMPLEX project from the European Research Council (ERC) under the European Union [ERC-2019-AdG 882679]; JSPS KAKENHI [JP19KK0076]; German Research Foundation (DFG) [415537506]; Austrian Research Promotion Agency (FFG); Federal Ministry of the Republic of Austria for Climate Action, Environment, Mobility, Innovation and Technology (BMK) [899537, 900565]

Available from: 2024-10-22 Created: 2024-10-22 Last updated: 2024-10-22

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Alarcon, Alvaro

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