The coherent motion of Cen A dwarf satellite galaxies remains a challenge for ΛcDM cosmology
dc.bibliographicCitation.firstPage | 2039973 | eng |
dc.bibliographicCitation.journalTitle | Astronomy and Astrophysics | eng |
dc.bibliographicCitation.volume | 645 | eng |
dc.contributor.author | Müller, Oliver | |
dc.contributor.author | Pawlowski, Marcel S. | |
dc.contributor.author | Lelli, Federico | |
dc.contributor.author | Fahrion, Katja | |
dc.contributor.author | Rejkuba, Marina | |
dc.contributor.author | Hilker, Michael | |
dc.contributor.author | Kanehisa, Jamie | |
dc.contributor.author | Libeskind, Noam | |
dc.contributor.author | Jerjen, Helmut | |
dc.date.accessioned | 2022-02-24T14:09:59Z | |
dc.date.available | 2022-02-24T14:09:59Z | |
dc.date.issued | 2021 | |
dc.description.abstract | The plane-of-satellites problem is one of the most severe small-scale challenges for the standard Λ cold dark matter (ΛCDM) cosmological model: Several dwarf galaxies around the Milky Way and Andromeda co-orbit in thin, planar structures. A similar case has been identified around the nearby elliptical galaxy Centaurus A (Cen A). In this Letter, we study the satellite system of Cen A, adding twelve new galaxies with line-of-sight velocities from VLT/MUSE observations. We find that 21 out of 28 dwarf galaxies with measured velocities share a coherent motion. Similarly, flattened and coherently moving structures are found only in 0.2% of Cen A analogs in the Illustris-TNG100 cosmological simulation, independently of whether we use its dark-matter-only or hydrodynamical run. These analogs are not co-orbiting, and they arise only by chance projection, thus they are short-lived structures in such simulations. Our findings indicate that the observed co-rotating planes of satellites are a persistent challenge for ΛCDM, which is largely independent from baryon physics. © O. Müller et al. 2021. | eng |
dc.description.version | publishedVersion | eng |
dc.identifier.uri | https://oa.tib.eu/renate/handle/123456789/8092 | |
dc.identifier.uri | https://doi.org/10.34657/7133 | |
dc.language.iso | eng | eng |
dc.publisher | Les Ulis : EDP Sciences | eng |
dc.relation.doi | https://doi.org/10.1051/0004-6361/202039973 | |
dc.relation.essn | 1432-0746 | |
dc.relation.issn | 0004-6361 | |
dc.rights.license | CC BY 4.0 Unported | eng |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | eng |
dc.subject.ddc | 520 | eng |
dc.subject.other | Cosmology: observations | eng |
dc.subject.other | Dark matter | eng |
dc.subject.other | Galaxies: dwarf | eng |
dc.subject.other | Galaxies: elliptical and lenticular, cD | eng |
dc.subject.other | Galaxies: halos | eng |
dc.subject.other | Galaxies: kinematics and dynamics | eng |
dc.title | The coherent motion of Cen A dwarf satellite galaxies remains a challenge for ΛcDM cosmology | eng |
dc.type | Article | eng |
dc.type | Text | eng |
tib.accessRights | openAccess | eng |
wgl.contributor | AIP | eng |
wgl.subject | Physik | eng |
wgl.type | Zeitschriftenartikel | eng |
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