Weak-lensing Characterization of the Dark Matter in 29 Merging Clusters that Exhibit Radio Relics
We present a multiwavelength analysis of 29 merging galaxy clusters that exhibit radio relics. For each merging system, we perform a weak-lensing analysis on Subaru optical imaging. We generate high-resolution mass maps of the dark matter distributions, which are critical for discerning the merging...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal Supplement Series |
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| Online Access: | https://doi.org/10.3847/1538-4365/adb0b6 |
| _version_ | 1826552337851744256 |
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| author | Kyle Finner M. James Jee Hyejeon Cho Kim HyeongHan Wonki Lee Reinout J. van Weeren David Wittman Mijin Yoon |
| author_facet | Kyle Finner M. James Jee Hyejeon Cho Kim HyeongHan Wonki Lee Reinout J. van Weeren David Wittman Mijin Yoon |
| author_sort | Kyle Finner |
| collection | DOAJ |
| description | We present a multiwavelength analysis of 29 merging galaxy clusters that exhibit radio relics. For each merging system, we perform a weak-lensing analysis on Subaru optical imaging. We generate high-resolution mass maps of the dark matter distributions, which are critical for discerning the merging constituents. Combining the weak-lensing detections with X-ray emission, radio emission, and galaxy redshifts, we discuss the formation of radio relics from the past collision. For each cluster, we obtain mass estimates by fitting a multicomponent Navarro–Frenk–White model with and without a concentration–mass relation. We compare the mass estimates of each subcluster to their velocity dispersion measurements and find that they preferentially lie below the expected velocity dispersion scaling relation, especially at the low-mass end (∼10 ^14 M _⊙ ). We show that the majority of the clusters that exhibit radio relics are in major mergers with a mass ratio below 1:4. We investigate the position of the mass peak relative to the galaxy luminosity peak, number density peak, and brightest cluster galaxy (BCG) locations and find that the BCG tends to better trace the mass peak position. Finally, we update a golden sample of eight galaxy clusters that have the simplest geometries and can provide the cleanest picture of the past merger, which we recommend for further investigation to constrain the nature of dark matter and the acceleration process that leads to radio relics. |
| first_indexed | 2025-03-14T07:07:32Z |
| format | Article |
| id | doaj.art-426adee55c784685bb76eb3cbcee3230 |
| institution | Directory Open Access Journal |
| issn | 0067-0049 |
| language | English |
| last_indexed | 2025-03-14T07:07:32Z |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Supplement Series |
| spelling | doaj.art-426adee55c784685bb76eb3cbcee32302025-03-04T07:08:30ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492025-01-0127712810.3847/1538-4365/adb0b6Weak-lensing Characterization of the Dark Matter in 29 Merging Clusters that Exhibit Radio RelicsKyle Finner0https://orcid.org/0000-0002-4462-0709M. James Jee1https://orcid.org/0000-0002-5751-3697Hyejeon Cho2https://orcid.org/0000-0001-5966-5072Kim HyeongHan3https://orcid.org/0000-0002-2550-5545Wonki Lee4https://orcid.org/0000-0002-1566-5094Reinout J. van Weeren5https://orcid.org/0000-0002-0587-1660David Wittman6https://orcid.org/0000-0002-0813-5888Mijin Yoon7https://orcid.org/0000-0002-3683-9559IPAC, California Institute of Technology , 1200 E California Boulevard, Pasadena, CA 91125, USA ; kfinner@caltech.edu; Department of Astronomy, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of KoreaDepartment of Astronomy, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea; Department of Physics and Astronomy, University of California , Davis, One Shields Avenue, Davis, CA 95616, USADepartment of Astronomy, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea; Center for Galaxy Evolution Research, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of KoreaDepartment of Astronomy, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of KoreaDepartment of Astronomy, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of KoreaLeiden Observatory, Leiden University , P.O. Box 9513, 2300 RA Leiden, The NetherlandsDepartment of Physics and Astronomy, University of California , Davis, One Shields Avenue, Davis, CA 95616, USALeiden Observatory, Leiden University , P.O. Box 9513, 2300 RA Leiden, The NetherlandsWe present a multiwavelength analysis of 29 merging galaxy clusters that exhibit radio relics. For each merging system, we perform a weak-lensing analysis on Subaru optical imaging. We generate high-resolution mass maps of the dark matter distributions, which are critical for discerning the merging constituents. Combining the weak-lensing detections with X-ray emission, radio emission, and galaxy redshifts, we discuss the formation of radio relics from the past collision. For each cluster, we obtain mass estimates by fitting a multicomponent Navarro–Frenk–White model with and without a concentration–mass relation. We compare the mass estimates of each subcluster to their velocity dispersion measurements and find that they preferentially lie below the expected velocity dispersion scaling relation, especially at the low-mass end (∼10 ^14 M _⊙ ). We show that the majority of the clusters that exhibit radio relics are in major mergers with a mass ratio below 1:4. We investigate the position of the mass peak relative to the galaxy luminosity peak, number density peak, and brightest cluster galaxy (BCG) locations and find that the BCG tends to better trace the mass peak position. Finally, we update a golden sample of eight galaxy clusters that have the simplest geometries and can provide the cleanest picture of the past merger, which we recommend for further investigation to constrain the nature of dark matter and the acceleration process that leads to radio relics.https://doi.org/10.3847/1538-4365/adb0b6Gravitational lensingWeak gravitational lensingDark matter distributionGalaxy clustersShocksIntracluster medium |
| spellingShingle | Kyle Finner M. James Jee Hyejeon Cho Kim HyeongHan Wonki Lee Reinout J. van Weeren David Wittman Mijin Yoon Weak-lensing Characterization of the Dark Matter in 29 Merging Clusters that Exhibit Radio Relics The Astrophysical Journal Supplement Series Gravitational lensing Weak gravitational lensing Dark matter distribution Galaxy clusters Shocks Intracluster medium |
| title | Weak-lensing Characterization of the Dark Matter in 29 Merging Clusters that Exhibit Radio Relics |
| title_full | Weak-lensing Characterization of the Dark Matter in 29 Merging Clusters that Exhibit Radio Relics |
| title_fullStr | Weak-lensing Characterization of the Dark Matter in 29 Merging Clusters that Exhibit Radio Relics |
| title_full_unstemmed | Weak-lensing Characterization of the Dark Matter in 29 Merging Clusters that Exhibit Radio Relics |
| title_short | Weak-lensing Characterization of the Dark Matter in 29 Merging Clusters that Exhibit Radio Relics |
| title_sort | weak lensing characterization of the dark matter in 29 merging clusters that exhibit radio relics |
| topic | Gravitational lensing Weak gravitational lensing Dark matter distribution Galaxy clusters Shocks Intracluster medium |
| url | https://doi.org/10.3847/1538-4365/adb0b6 |
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