Distribution of Metals and Multi-Temperature Gas in the Cores of Nearby Galaxy Groups
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arXiv
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| Natura: | Preprint |
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2025
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| author | Chatzigiannakis, Dimitris Simionescu, Aurora Mernier, François |
| author_facet | Chatzigiannakis, Dimitris Simionescu, Aurora Mernier, François |
| contents | Previous studies of galaxy clusters have focused extensively on the effects of active galactic nuclei (AGN) feedback on the chemical evolution of the intra-cluster medium (ICM). However, similar studies on the atmospheres of lower mass systems, such as galaxy groups and giant ellipticals, remain limited. In this work, we present a systematic analysis of the chemical and multi-temperature structure of the intra-group medium (IGrM), using a subsample of nearby galaxy groups and ellipticals from the CHEERS catalogue. By comparing areas with and without AGN feedback related features, such as cavities or extended radio lobes, we find clear evidence of an excess of multi-phase gas along the path of recent AGN feedback. However, its distribution exceeds the length of the radio lobes, since we recover a non-negligible amount of multi-phase gas at larger radii. In contrast to the clear asymmetry in the thermal structure, we find no directional enhancement in the distribution of Fe, with little to no differences in the Fe abundances of the on- and off-lobe directions. Our analysis suggests that the metals in the IGrM of our targets are well-mixed and decoupled from the effects of recent AGN feedback, as indicated by radio-lobes and cavities. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_18258 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Distribution of Metals and Multi-Temperature Gas in the Cores of Nearby Galaxy Groups Chatzigiannakis, Dimitris Simionescu, Aurora Mernier, François Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Previous studies of galaxy clusters have focused extensively on the effects of active galactic nuclei (AGN) feedback on the chemical evolution of the intra-cluster medium (ICM). However, similar studies on the atmospheres of lower mass systems, such as galaxy groups and giant ellipticals, remain limited. In this work, we present a systematic analysis of the chemical and multi-temperature structure of the intra-group medium (IGrM), using a subsample of nearby galaxy groups and ellipticals from the CHEERS catalogue. By comparing areas with and without AGN feedback related features, such as cavities or extended radio lobes, we find clear evidence of an excess of multi-phase gas along the path of recent AGN feedback. However, its distribution exceeds the length of the radio lobes, since we recover a non-negligible amount of multi-phase gas at larger radii. In contrast to the clear asymmetry in the thermal structure, we find no directional enhancement in the distribution of Fe, with little to no differences in the Fe abundances of the on- and off-lobe directions. Our analysis suggests that the metals in the IGrM of our targets are well-mixed and decoupled from the effects of recent AGN feedback, as indicated by radio-lobes and cavities. |
| title | Distribution of Metals and Multi-Temperature Gas in the Cores of Nearby Galaxy Groups |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2509.18258 |