Spatially Resolved Stellar Kinematics of the Ultra-diffuse Galaxy Dragonfly 44. II. Constraints on Fuzzy Dark Matter
| Autor: | Alexa Villaume, John Tamanas, Pieter van Dokkum, Shany Danieli, Jean P. Brodie, Asher Wasserman, Aaron J. Romanowsky, Roberto Abraham, Christopher Martin, Stefano Profumo, Duncan A. Forbes, Matt Matuszewski |
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| Rok vydání: | 2019 |
| Předmět: |
Stellar kinematics
010504 meteorology & atmospheric sciences astro-ph.GA Dark matter FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astronomy & Astrophysics 01 natural sciences Atomic Physical Chemistry Cosmology dark matter Particle and Plasma Physics Stellar dynamics 0103 physical sciences kinematics and dynamics [galaxies] Coma Cluster Nuclear 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Dwarf galaxy Physics individual [galaxies] Molecular Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy halos [galaxies] Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Halo Astronomical and Space Sciences Physical Chemistry (incl. Structural) |
| Zdroj: | Astrophysical Journal, vol 885, iss 2 Wasserman, Asher; Dokkum, Pieter van; Romanowsky, Aaron J; Brodie, Jean; Danieli, Shany; Forbes, Duncan A; et al.(2019). Spatially Resolved Stellar Kinematics of the Ultra-Diffuse Galaxy Dragonfly 44: II. Constraints on Fuzzy Dark Matter. UC Santa Cruz: Retrieved from: http://www.escholarship.org/uc/item/5982p41g The Astrophysical Journal, vol 885, iss 2 |
| Popis: | Given the absence of directly detected dark matter (DM) as weakly interacting massive particles, there is strong interest in the possibility that DM is an ultra-light scalar field, here denoted as fuzzy DM. Ultra-diffuse galaxies, with the sizes of giant galaxies and the luminosities of dwarf galaxies, have a wide range of DM halo masses, thus providing new opportunities for exploring the connections between galaxies and their DM halos. Following up on new integral field unit spectroscopic observations and dynamics modeling of the DM-dominated ultra-diffuse galaxy Dragonfly 44 in the outskirts of the Coma Cluster, we present models of fuzzy DM constrained by the stellar dynamics of this galaxy. We infer a scalar field mass of $\sim 3 \times 10^{-22}$ eV, consistent with other constraints from galaxy dynamics but in tension with constraints from Ly$\alpha$ forest power spectrum modeling. While we are unable to statistically distinguish between fuzzy DM and normal cold DM models, we find that the inferred properties of the fuzzy DM halo satisfy a number of predictions for halos in a fuzzy DM cosmology. In particular, we find good agreement with the predicted core size--halo mass relation and the predicted transition radius between the quantum pressure-dominated inner region and the outer halo region. Comment: 15 pages, 11 figures. Submitted to ApJ, comments are welcome! |
| Databáze: | OpenAIRE |
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