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The APOSTLE simulations: Rotation curves derived from synthetic 21-cm observations

Published online by Cambridge University Press:  02 August 2018

Kyle A. Oman Open the ORCID record for Kyle A. Oman [Opens in a new window]
Kyle A. Oman*
Affiliation:
Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 5C2, Canada email: [email protected]
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Abstract

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The apostle cosmological hydrodynamical simulation suite is a collection of twelve regions ~5 Mpc in diameter, selected to resemble the Local Group of galaxies in terms of kinematics and environment, and re-simulated at high resolution (minimum gas particle mass of 104 M⊙) using the galaxy formation model and calibration developed for the eagle project. I select a sample of dwarf galaxies (60 < Vmax/km s−1 < 120) from these simulations and construct synthetic spatially- and spectrally-resolved observations of their 21-cm emission. Using the 3Dbarolo tilted-ring modelling tool, I extract rotation curves from the synthetic data cubes. In many cases, non-circular motions present in the gas disc hinder the recovery of a rotation curve which accurately traces the underlying mass distribution; a large central deficit of dark matter, relative to the predictions of cold dark matter N-body simulations, may then be erroneously inferred.

Keywords

Galaxies: halosgalaxies: kinematics and dynamicsdark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 213 - 218
Copyright
Copyright © International Astronomical Union 2018 

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