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