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Title: HI scale height in dwarf galaxies
Authors: Patra, Narendra Nath
Keywords: atomic data
galaxies: dwarf
galaxies: kinematics and dynamics
galaxies: structure
radio lines: ISM
Issue Date: Jul-2020
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2020, Vol.495, p2867–2881
Abstract: Assuming a vertical hydrostatic equilibrium in the baryonic discs, joint Poisson–Boltzmann equation was set up and solved numerically in a sample of 23 nearby dwarf galaxies from the LITTLE-THINGS survey. This is the largest sample to date for which detailed hydrostatic modelling is performed. The solutions of the Poisson–Boltzmann equation provide a complete three-dimensional distribution of the atomic hydrogen (H I) in these galaxies. Using these solutions, we estimate the vertical scale height (defined as the half width at half maxima of the density distribution) of the H I as a function of radius. We find that the scale height in our sample galaxies varies between a few hundred parsec at the centre to a few kiloparsec at the edge. These values are significantly higher than what is observed in spiral galaxies. We further estimate the axial ratios to investigate the thickness of the H I discs in dwarf galaxies. For our sample galaxies, we find a median axial ratio to be 0.40, which is much higher than the same observed in the Milky Way. This indicates that the vertical hydrostatic equilibrium results in thicker H I discs in dwarf galaxies naturally.
Description: Open Access
ISSN: 0035-8711
1365-2966 (online)
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Copyright: 2020 The Author(s)
Appears in Collections:Research Papers (A&A)

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