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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The cold gas content of bulgeless dwarf galaxies
Monthly Notices of the Royal Astronomical Society, Volume 417, No. 4, Year 2011
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Description
We present an analysis of the neutral hydrogen (Hi) properties of a fully cosmological hydrodynamical dwarf galaxy, run with varying simulation parameters. As reported by Governato et al., the high-resolution, high star formation density threshold version of this galaxy is the first simulation to result in the successful reproduction of a (dwarf) spiral galaxy without any associated stellar bulge. We have set out to compare in detail the Hi distribution and kinematics of this simulated bulgeless disc with what is observed in a sample of nearby dwarfs. To do so, we extracted the radial gas density profiles, velocity dispersion (e.g. velocity ellipsoid and turbulence) and the power spectrum of structure within the cold interstellar medium (ISM) from the simulations. The highest resolution dwarf, when using a high-density star formation threshold comparable to densities of giant molecular clouds, possesses bulk characteristics consistent with those observed in nature, though the cold gas is not as radially extended as that observed in nearby dwarfs, resulting in somewhat excessive surface densities. The lines-of-sight velocity dispersion radial profiles have values that are in good agreement with the observed dwarf galaxies, but due to the fact that only the streaming velocities of particles are tracked, a correction to include the thermal velocities can lead to profiles that are quite flat. The ISM power spectra of the simulations appear to possess more power on smaller spatial scales than that of the Small Magellanic Cloud. We conclude that unavoidable limitations remain due to the unresolved physics of star formation and feedback within parsec-scale molecular clouds. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Authors & Co-Authors
Pilkington, Kate
United Kingdom, Preston
University of Central Lancashire
Canada, Halifax
Saint Mary's University
Gibson, Brad K.
United Kingdom, Preston
University of Central Lancashire
Canada, Halifax
Saint Mary's University
Calura, Francesco
United Kingdom, Preston
University of Central Lancashire
Brooks, Alyson M.
United States, Pasadena
California Institute of Technology
Mayer, Lucio
Switzerland, Zurich
Universität Zürich
Switzerland, Zurich
Eth Zürich
Brook, Chris B.
United Kingdom, Preston
University of Central Lancashire
Stinson, Gregory S.
United Kingdom, Preston
University of Central Lancashire
Thacker, Robert J.
Canada, Halifax
Saint Mary's University
Few, C. Gareth
United Kingdom, Preston
University of Central Lancashire
Cunnama, Daniel
South Africa, Bellville
University of the Western Cape
Wadsley, James W.
Canada, Hamilton
Mcmaster University
Statistics
Citations: 21
Authors: 11
Affiliations: 7
Identifiers
Doi:
10.1111/j.1365-2966.2011.19450.x
ISSN:
00358711
e-ISSN:
13652966