Spatially-resolved stellar kinematics of the ultra diffuse galaxy Dragonfly 44. I. Observations, kinematics, and cold dark matter halo fits
| Autor: | Aaron J. Romanowsky, Asher Wasserman, Jean P. Brodie, Matt Matuszewski, Charlie Conroy, Christopher Martin, Roberto Abraham, Shany Danieli, Alexa Villaume, Duncan A. Forbes, Pieter van Dokkum |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Effective radius Stellar kinematics Cold dark matter 010504 meteorology & atmospheric sciences Dark matter Velocity dispersion FOS: Physical sciences Astronomy and Astrophysics Radius Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxy Luminosity Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.1904.04838 |
| Popis: | We present spatially-resolved stellar kinematics of the well-studied ultra diffuse galaxy (UDG) Dragonfly 44, as determined from 25.3 hrs of observations with the Keck Cosmic Web Imager. The luminosity-weighted dispersion within the half-light radius is $\sigma_{1/2}=33^{+3}_{-3}$ km/s. There is no evidence for rotation, with $V/\sigma Comment: Accepted to ApJ. Figure 7 shows off the capabilities of KCWI. The key observational result, the radial dispersion profile, is shown in Fig. 14. Figure 16 demonstrates the aperture-dependence of the M/L ratio. Figs 17 and 18 show fits to NFW profiles and Di Cintio cored profiles. People interested in the variation of the night sky spectrum might enjoy Figure 3! |
| Databáze: | OpenAIRE |
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