On the presence of a universal acceleration scale in elliptical galaxies
| Autor: | Mariangela Bernardi, Ravi K. Sheth, Kyu-Hyun Chae, Helena Domínguez Sánchez |
|---|---|
| Přispěvatelé: | National Research Foundation of Korea, Consejo Superior de Investigaciones Científicas (España) |
| Rok vydání: | 2020 |
| Předmět: |
High Energy Physics - Theory
Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010504 meteorology & atmospheric sciences Dark matter FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences General Relativity and Quantum Cosmology Acceleration 0103 physical sciences 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Physics Universality (philosophy) Velocity dispersion Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Modified Newtonian dynamics Baryon High Energy Physics - Theory (hep-th) Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Elliptical galaxy Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | arXiv:2010.10779v2 Dark matter phenomena in rotationally supported galaxies exhibit a characteristic acceleration scale of g† ≈ 1.2 × 10−10 m s−2. Whether this acceleration is a manifestation of a universal scale, or merely an emergent property with an intrinsic scatter, has been debated in the literature. Here we investigate whether a universal acceleration scale exists in dispersion-supported galaxies using two uniform sets of integral field spectroscopy (IFS) data from SDSS-IV MaNGA and ATLAS3D. We apply the spherical Jeans equation to 15 MaNGA and 4 ATLAS3D slow-rotator E0 (i.e., nearly spherical) galaxies. Velocity dispersion profiles for these galaxies are well determined with observational errors under control. Bayesian inference indicates that all 19 galaxies are consistent with a universal acceleration of g† = 1.5+0.9−0.6 × 10−10 m s−2. Moreover, all 387 data points from the radial bins of the velocity dispersion profiles are consistent with a universal relation between the radial acceleration traced by dynamics and that predicted by the observed distribution of baryons. This universality remains if we include 12 additional non-E0 slow-rotator elliptical galaxies from ATLAS3D. Finally, the universal acceleration from MaNGA and ATLAS3D is consistent with that for rotationally supported galaxies, so our results support the view that dark matter phenomenology in galaxies involves a universal acceleration scale. This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2019R1F1A1062477). M.B. acknowledges support from the NFS grant AST-1816330. H.D.S. acknowledges support from the Centro Superior de Investigaciones Cientificas PIE2018-50E099. |
| Databáze: | OpenAIRE |
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