Declining Rotation Curves at z = 2 in ΛCDM Galaxy Formation Simulations
| Autor: | Adelheid F. Teklu, Alexander Arth, Rhea-Silvia Remus, Aura Obreja, Felix Schulze, Klaus Dolag, Andreas Burkert |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
education.field_of_study 010308 nuclear & particles physics Star formation Dark matter Population Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxy Baryon Space and Planetary Science 0103 physical sciences Galaxy formation and evolution Halo education 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Galaxy rotation curve |
| Zdroj: | Web of Science |
| ISSN: | 2041-8213 |
| DOI: | 10.3847/2041-8213/aaaeb4 |
| Popis: | Selecting disk galaxies from the cosmological, hydrodynamical simulation Magneticum Pathfinder we show that almost half of our poster child disk galaxies at $z=2$ show significantly declining rotation curves and low dark matter fractions, very similar to recently reported observations. These galaxies do not show any anomalous behavior, reside in standard dark matter halos and typically grow significantly in mass until $z = 0$, where they span all morphological classes, including disk galaxies matching present day rotation curves and observed dark matter fractions. Our findings demonstrate that declining rotation curves and low dark matter fractions in rotation dominated galaxies at $z=2$ appear naturally within the $\Lambda$CDM paradigm and reflect the complex baryonic physics, which plays a role at the peak epoch of star-formation. In addition, we find some dispersion dominated galaxies at $z=2$ which host a significant gas disk and exhibit similar shaped rotation curves as the disk galaxy population, rendering it difficult to differentiate between these two populations with currently available observation techniques. Comment: 6 pages, 4 figures, ApJ Letters in press, www.magneticum.org |
| Databáze: | OpenAIRE |
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