The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo Concentration
We investigate the role of halo concentration in the formation of intracluster light (ICL) in galaxy groups and clusters, as predicted by a state-of-the-art semianalytic model of galaxy formation, coupled with a set of high-resolution dark-matter-only simulations. The analysis focuses on how the fra...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acfd25 |
| _version_ | 1797627916842958848 |
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| author | Emanuele Contini Seyoung Jeon Jinsu Rhee San Han Sukyoung K. Yi |
| author_facet | Emanuele Contini Seyoung Jeon Jinsu Rhee San Han Sukyoung K. Yi |
| author_sort | Emanuele Contini |
| collection | DOAJ |
| description | We investigate the role of halo concentration in the formation of intracluster light (ICL) in galaxy groups and clusters, as predicted by a state-of-the-art semianalytic model of galaxy formation, coupled with a set of high-resolution dark-matter-only simulations. The analysis focuses on how the fraction of ICL correlates with halo mass, concentration, and fraction of early-type galaxies (ETGs) in a large sample of groups and clusters with $13.0\leqslant \mathrm{log}{M}_{\mathrm{halo}}\leqslant 15.0$ . The fraction of ICL follows a normal distribution, a consequence of the stochastic nature of the physical processes responsible for the formation of the diffuse light. The fractional budget of ICL depends on both halo mass (very weakly) until group scales, and concentration (remarkably). More interestingly, the ICL fraction is higher in more concentrated objects, a result of the stronger tidal forces acting in the innermost regions of the halos where the concentration is the quantity playing the most relevant role. Our model predictions do not show any dependence between the ICL and ETGs fractions, and so we instead suggest the concentration rather than the mass, as recently claimed, to be the main driver of the ICL formation. The diffuse light starts to form in groups via stellar stripping and mergers and later assembled in more-massive objects. However, the formation and assembly keep going on group/cluster scales at lower redshift through the same processes, mainly via stellar stripping in the vicinity of the central regions where tidal forces are stronger. |
| first_indexed | 2024-03-11T10:31:16Z |
| format | Article |
| id | doaj.art-068e4f4d28fb433e80235fb5afae9735 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-11T10:31:16Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-068e4f4d28fb433e80235fb5afae97352023-11-14T15:56:01ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195817210.3847/1538-4357/acfd25The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo ConcentrationEmanuele Contini0https://orcid.org/0000-0002-2873-8598Seyoung Jeon1Jinsu Rhee2https://orcid.org/0000-0002-0184-9589San Han3Sukyoung K. Yi4https://orcid.org/0000-0002-4556-2619Department of Astronomy and Yonsei University Observatory, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea ; emanuele.contini82@gmail.comDepartment of Astronomy and Yonsei University Observatory, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea ; emanuele.contini82@gmail.comDepartment of Astronomy and Yonsei University Observatory, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea ; emanuele.contini82@gmail.com; Korea Astronomy and Space Science Institute , 776, Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of KoreaDepartment of Astronomy and Yonsei University Observatory, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea ; emanuele.contini82@gmail.comDepartment of Astronomy and Yonsei University Observatory, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea ; emanuele.contini82@gmail.comWe investigate the role of halo concentration in the formation of intracluster light (ICL) in galaxy groups and clusters, as predicted by a state-of-the-art semianalytic model of galaxy formation, coupled with a set of high-resolution dark-matter-only simulations. The analysis focuses on how the fraction of ICL correlates with halo mass, concentration, and fraction of early-type galaxies (ETGs) in a large sample of groups and clusters with $13.0\leqslant \mathrm{log}{M}_{\mathrm{halo}}\leqslant 15.0$ . The fraction of ICL follows a normal distribution, a consequence of the stochastic nature of the physical processes responsible for the formation of the diffuse light. The fractional budget of ICL depends on both halo mass (very weakly) until group scales, and concentration (remarkably). More interestingly, the ICL fraction is higher in more concentrated objects, a result of the stronger tidal forces acting in the innermost regions of the halos where the concentration is the quantity playing the most relevant role. Our model predictions do not show any dependence between the ICL and ETGs fractions, and so we instead suggest the concentration rather than the mass, as recently claimed, to be the main driver of the ICL formation. The diffuse light starts to form in groups via stellar stripping and mergers and later assembled in more-massive objects. However, the formation and assembly keep going on group/cluster scales at lower redshift through the same processes, mainly via stellar stripping in the vicinity of the central regions where tidal forces are stronger.https://doi.org/10.3847/1538-4357/acfd25Galaxy formation |
| spellingShingle | Emanuele Contini Seyoung Jeon Jinsu Rhee San Han Sukyoung K. Yi The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo Concentration The Astrophysical Journal Galaxy formation |
| title | The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo Concentration |
| title_full | The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo Concentration |
| title_fullStr | The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo Concentration |
| title_full_unstemmed | The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo Concentration |
| title_short | The Intracluster Light and Its Link with the Dynamical State of the Host Group/Cluster: The Role of the Halo Concentration |
| title_sort | intracluster light and its link with the dynamical state of the host group cluster the role of the halo concentration |
| topic | Galaxy formation |
| url | https://doi.org/10.3847/1538-4357/acfd25 |
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