Merger-driven multi-scale ICM density perturbations: testing cosmological simulations and constraining plasma physics
The hot intracluster medium (ICM) provides a unique laboratory to test multi-scale physics in numerical simulations and probe plasma physics. Utilizing archival Chandra observations, we measure density fluctuations in the ICM in a sample of 80 nearby (z
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| creator | Heinrich, Annie Zhuravleva, Irina Zhang, Congyao Churazov, Eugene Forman, William van Weeren, Reinout J |
| description | The hot intracluster medium (ICM) provides a unique laboratory to test
multi-scale physics in numerical simulations and probe plasma physics.
Utilizing archival Chandra observations, we measure density fluctuations in the
ICM in a sample of 80 nearby (z |
| doi_str_mv | 10.48550/arxiv.2401.15179 |
| format | Article |
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multi-scale physics in numerical simulations and probe plasma physics.
Utilizing archival Chandra observations, we measure density fluctuations in the
ICM in a sample of 80 nearby (z<1) galaxy clusters and infer scale-dependent
velocities within regions affected by mergers (r<R2500c), excluding cool-cores.
Systematic uncertainties (e.g., substructures, cluster asymmetries) are
carefully explored to ensure robust measurements within the bulk ICM. We find
typical velocities ~220 (300) km/s in relaxed (unrelaxed) clusters, which
translate to non-thermal pressure fractions ~4 (8) per cent, and clumping
factors ~1.03 (1.06). We show that density fluctuation amplitudes could
distinguish relaxed from unrelaxed clusters in these regions. Comparison with
density fluctuations in cosmological simulations shows good agreement in
merging clusters. Simulations underpredict the amplitude of fluctuations in
relaxed clusters on length scales <0.75 R2500c, suggesting these systems are
most sensitive to missing physics in the simulations. In clusters hosting radio
halos, we examine correlations between gas velocities, turbulent dissipation
rate, and radio emission strength/efficiency to test turbulent re-acceleration
of cosmic ray electrons. We measure a weak correlation, driven by a few outlier
clusters, in contrast to some previous studies. Finally, we present upper
limits on effective viscosity in the bulk ICM of 16 clusters, showing it is
systematically suppressed by at least a factor of 8, and the suppression is a
general property of the ICM. Confirmation of our results with direct velocity
measurements will be possible soon with XRISM.</description><identifier>DOI: 10.48550/arxiv.2401.15179</identifier><language>eng</language><subject>Physics - Cosmology and Nongalactic Astrophysics ; Physics - High Energy Astrophysical Phenomena</subject><creationdate>2024-01</creationdate><rights>http://arxiv.org/licenses/nonexclusive-distrib/1.0</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,776,881</link.rule.ids><linktorsrc>$$Uhttps://arxiv.org/abs/2401.15179$$EView_record_in_Cornell_University$$FView_record_in_$$GCornell_University$$Hfree_for_read</linktorsrc><backlink>$$Uhttps://doi.org/10.48550/arXiv.2401.15179$$DView paper in arXiv$$Hfree_for_read</backlink></links><search><creatorcontrib>Heinrich, Annie</creatorcontrib><creatorcontrib>Zhuravleva, Irina</creatorcontrib><creatorcontrib>Zhang, Congyao</creatorcontrib><creatorcontrib>Churazov, Eugene</creatorcontrib><creatorcontrib>Forman, William</creatorcontrib><creatorcontrib>van Weeren, Reinout J</creatorcontrib><title>Merger-driven multi-scale ICM density perturbations: testing cosmological simulations and constraining plasma physics</title><description>The hot intracluster medium (ICM) provides a unique laboratory to test
multi-scale physics in numerical simulations and probe plasma physics.
Utilizing archival Chandra observations, we measure density fluctuations in the
ICM in a sample of 80 nearby (z<1) galaxy clusters and infer scale-dependent
velocities within regions affected by mergers (r<R2500c), excluding cool-cores.
Systematic uncertainties (e.g., substructures, cluster asymmetries) are
carefully explored to ensure robust measurements within the bulk ICM. We find
typical velocities ~220 (300) km/s in relaxed (unrelaxed) clusters, which
translate to non-thermal pressure fractions ~4 (8) per cent, and clumping
factors ~1.03 (1.06). We show that density fluctuation amplitudes could
distinguish relaxed from unrelaxed clusters in these regions. Comparison with
density fluctuations in cosmological simulations shows good agreement in
merging clusters. Simulations underpredict the amplitude of fluctuations in
relaxed clusters on length scales <0.75 R2500c, suggesting these systems are
most sensitive to missing physics in the simulations. In clusters hosting radio
halos, we examine correlations between gas velocities, turbulent dissipation
rate, and radio emission strength/efficiency to test turbulent re-acceleration
of cosmic ray electrons. We measure a weak correlation, driven by a few outlier
clusters, in contrast to some previous studies. Finally, we present upper
limits on effective viscosity in the bulk ICM of 16 clusters, showing it is
systematically suppressed by at least a factor of 8, and the suppression is a
general property of the ICM. Confirmation of our results with direct velocity
measurements will be possible soon with XRISM.</description><subject>Physics - Cosmology and Nongalactic Astrophysics</subject><subject>Physics - High Energy Astrophysical Phenomena</subject><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><sourceid>GOX</sourceid><recordid>eNotj71ugzAUhVk6VGkfoFP9AlBsY7C7Vag_kRJ1yY4u9oVaAoNsE5W3L0k6neGc70hfkjzRPCukEPkL-F97zliR04wKWqn7ZDmi79GnxtszOjIuQ7Rp0DAg2ddHYtAFG1cyo4-LbyHayYVXEjFE63qipzBOw9TbDSDBbvRtQcCZrXQherDuspwHCCOQ-WcNVoeH5K6DIeDjf-6S08f7qf5KD9-f-_rtkEJZqVR2nJWdYGB4x7GkWrZcQwuqBSxUAQwl5F3OoGwlU8iFUKoyTBpNUTFT8F3yfLu9ejeztyP4tbn4N1d__gc-5VmG</recordid><startdate>20240126</startdate><enddate>20240126</enddate><creator>Heinrich, Annie</creator><creator>Zhuravleva, Irina</creator><creator>Zhang, Congyao</creator><creator>Churazov, Eugene</creator><creator>Forman, William</creator><creator>van Weeren, Reinout J</creator><scope>GOX</scope></search><sort><creationdate>20240126</creationdate><title>Merger-driven multi-scale ICM density perturbations: testing cosmological simulations and constraining plasma physics</title><author>Heinrich, Annie ; Zhuravleva, Irina ; Zhang, Congyao ; Churazov, Eugene ; Forman, William ; van Weeren, Reinout J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a679-8f326f52ad3f3e61c8b3caba9bae494a2e8a0f02a6b829e355997d28dc1e92d43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Physics - Cosmology and Nongalactic Astrophysics</topic><topic>Physics - High Energy Astrophysical Phenomena</topic><toplevel>online_resources</toplevel><creatorcontrib>Heinrich, Annie</creatorcontrib><creatorcontrib>Zhuravleva, Irina</creatorcontrib><creatorcontrib>Zhang, Congyao</creatorcontrib><creatorcontrib>Churazov, Eugene</creatorcontrib><creatorcontrib>Forman, William</creatorcontrib><creatorcontrib>van Weeren, Reinout J</creatorcontrib><collection>arXiv.org</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Heinrich, Annie</au><au>Zhuravleva, Irina</au><au>Zhang, Congyao</au><au>Churazov, Eugene</au><au>Forman, William</au><au>van Weeren, Reinout J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Merger-driven multi-scale ICM density perturbations: testing cosmological simulations and constraining plasma physics</atitle><date>2024-01-26</date><risdate>2024</risdate><abstract>The hot intracluster medium (ICM) provides a unique laboratory to test
multi-scale physics in numerical simulations and probe plasma physics.
Utilizing archival Chandra observations, we measure density fluctuations in the
ICM in a sample of 80 nearby (z<1) galaxy clusters and infer scale-dependent
velocities within regions affected by mergers (r<R2500c), excluding cool-cores.
Systematic uncertainties (e.g., substructures, cluster asymmetries) are
carefully explored to ensure robust measurements within the bulk ICM. We find
typical velocities ~220 (300) km/s in relaxed (unrelaxed) clusters, which
translate to non-thermal pressure fractions ~4 (8) per cent, and clumping
factors ~1.03 (1.06). We show that density fluctuation amplitudes could
distinguish relaxed from unrelaxed clusters in these regions. Comparison with
density fluctuations in cosmological simulations shows good agreement in
merging clusters. Simulations underpredict the amplitude of fluctuations in
relaxed clusters on length scales <0.75 R2500c, suggesting these systems are
most sensitive to missing physics in the simulations. In clusters hosting radio
halos, we examine correlations between gas velocities, turbulent dissipation
rate, and radio emission strength/efficiency to test turbulent re-acceleration
of cosmic ray electrons. We measure a weak correlation, driven by a few outlier
clusters, in contrast to some previous studies. Finally, we present upper
limits on effective viscosity in the bulk ICM of 16 clusters, showing it is
systematically suppressed by at least a factor of 8, and the suppression is a
general property of the ICM. Confirmation of our results with direct velocity
measurements will be possible soon with XRISM.</abstract><doi>10.48550/arxiv.2401.15179</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Physics - Cosmology and Nongalactic Astrophysics Physics - High Energy Astrophysical Phenomena |
| title | Merger-driven multi-scale ICM density perturbations: testing cosmological simulations and constraining plasma physics |
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