The interplay of self-interacting dark matter and baryons in shaping the halo evolution
- We use high-resolution hydrodynamical simulation to test the difference of halo properties in cold dark matter (CDM) and a self-interacting dark matter (SIDM) scenario with a constant cross-section of sigma(T)/m(x) = 1 cm(2) g(-1). We find that the interplay between dark matter self-interaction and baryonic physics induces a complex evolution of the halo properties, which depends on the halo mass and morphological type, as well as on the halo mass accretion history. While high-mass haloes, selected as analogues of early-type galaxies, show cored profiles in the SIDM run, systems of intermediate mass and with a significant disc component can develop a profile that is similar or cuspier than in CDM. The final properties of SIDM haloes - measured at z = 0.2 - correlate with the halo concentration and formation time, suggesting that the differences between different systems are due to the fact that we are observing the impact of self-interaction. We also search for signatures of SIDM in the lensing signal of the main haloes and find hintsWe use high-resolution hydrodynamical simulation to test the difference of halo properties in cold dark matter (CDM) and a self-interacting dark matter (SIDM) scenario with a constant cross-section of sigma(T)/m(x) = 1 cm(2) g(-1). We find that the interplay between dark matter self-interaction and baryonic physics induces a complex evolution of the halo properties, which depends on the halo mass and morphological type, as well as on the halo mass accretion history. While high-mass haloes, selected as analogues of early-type galaxies, show cored profiles in the SIDM run, systems of intermediate mass and with a significant disc component can develop a profile that is similar or cuspier than in CDM. The final properties of SIDM haloes - measured at z = 0.2 - correlate with the halo concentration and formation time, suggesting that the differences between different systems are due to the fact that we are observing the impact of self-interaction. We also search for signatures of SIDM in the lensing signal of the main haloes and find hints of potential differences in the distribution of Einstein radii, which suggests that future wide-field survey might be able to distinguish between CDM and SIDM models on this basis. Finally, we find that the subhalo abundances are not altered in the adopted SIDM model with respect to CDM.…
Verfasserangaben: | Giulia DespaliORCiD, Martin SparreORCiDGND, Simona Vegetti, Mark Vogelsberger, Jesús Zavala, Federico MarinacciORCiD |
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DOI: | https://doi.org/10.1093/mnras/stz273 |
ISSN: | 0035-8711 |
ISSN: | 1365-2966 |
Titel des übergeordneten Werks (Englisch): | Monthly notices of the Royal Astronomical Society |
Verlag: | Oxford University Press |
Verlagsort: | Oxford |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Datum der Erstveröffentlichung: | 25.04.2019 |
Erscheinungsjahr: | 2019 |
Datum der Freischaltung: | 10.03.2021 |
Freies Schlagwort / Tag: | dark matter; galaxies: haloes; gravitational lensing: strong; methods: numerical |
Band: | 484 |
Ausgabe: | 4 |
Seitenanzahl: | 11 |
Erste Seite: | 4563 |
Letzte Seite: | 4573 |
Fördernde Institution: | European Research Council under ERC-CoG grant [CRAGSMAN-646955]; research and innovation programmeEuropean Research Council (ERC) [758853]; MIT RSC award; Kavli Research Investment Fund; NASA ATP grant [NNX17AG29G]; NSFNational Science Foundation (NSF) [AST-1814053, AST-1814259]; Grant of Excellence from the Icelandic Research Fund [173929-051] |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
Peer Review: | Referiert |
Publikationsweg: | Open Access / Green Open-Access |