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Ultra-diffuse galaxies (UDGs) are as faint as dwarf galaxies but whose sizesare similar to those of spiral galaxies. A variety of formation mechanisms havebeen proposed, some of which could result in different disk thicknesses. Inthis study, we measure the radial profile of the HI scale height (h_g) andflaring angle (h_g/R) of AGC 242019 through the joint Poisson-Boltzmannequation based on its well spatially-resolved HI gas maps. The mean HI scaleheight of AGC 242019 is <h_g> \approx 537.15 \pm 89.4 pc, and the mean flaringangle is <h_g/R> \approx 0.19 \pm 0.03. As a comparison, we also derive thedisk thickness for a sample of 14 dwarf irregulars. It is found that the HIdisk of AGC 242019 has comparable thickness to dwarfs. This suggests that AGC242019 is unlikely to experience much stronger stellar feedback than dwarfgalaxies, which otherwise leads to a thicker disk for this galaxy.

The HI Gas Disk Thickness of the Ultra-diffuse Galaxy AGC 242019