Dark Matter Deficient Galaxies Produced Via High-velocity Galaxy Collisions In High-resolution Numerical Simulations
| Autor: | Yongseok Jo, Minyong Jung, Boon Kiat Oh, Joohyun Lee, Eun-jin Shin, Goojin Kwon, Ji-hoon Kim |
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| Přispěvatelé: | Shin, EJ [0000-0002-4639-5285], Kim, JH [0000-0003-4464-1160], Apollo - University of Cambridge Repository |
| Rok vydání: | 2020 |
| Předmět: |
Structure formation
Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010504 meteorology & atmospheric sciences media_common.quotation_subject Dark matter Hydrodynamical simulations FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Cosmology Galaxy evolution Large-scale structure of the universe 0103 physical sciences Galaxy formation and evolution Interacting galaxy 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences media_common Dwarf galaxy Physics Galaxy formation Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Universe Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics - Cosmology and Nongalactic Astrophysics |
| DOI: | 10.48550/arxiv.2007.09889 |
| Popis: | The recent discovery of diffuse dwarf galaxies that are deficient in dark matter appears to challenge the current paradigm of structure formation in our Universe. We describe the numerical experiments to determine if the so-called dark matter deficient galaxies (DMDGs) could be produced when two gas-rich, dwarf-sized galaxies collide with a high relative velocity of $\sim 300\,{\rm kms^{-1}}$. Using idealized high-resolution simulations with both mesh-based and particle-based gravito-hydrodynamics codes, we find that DMDGs can form as high-velocity galaxy collisions separate dark matter from the warm disk gas which subsequently is compressed by shock and tidal interaction to form stars. Then using a large simulated universe IllustrisTNG, we discover a number of high-velocity galaxy collision events in which DMDGs are expected to form. However, we did not find evidence that these types of collisions actually produced DMDGs in the TNG100-1 run. We argue that the resolution of the numerical experiment is critical to realize the "collision-induced" DMDG formation scenario. Our results demonstrate one of many routes in which galaxies could form with unconventional dark matter fractions. Comment: 18 pages including 13 figures. Accepted for publication in ApJ. For associated movies and information, see https://ejshin0.github.io/page/category/visualizations.html and https://physics.snu.ac.kr/cosmo/index/research.html#dmdg |
| Databáze: | OpenAIRE |
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