论文标题
超扩散星系AGC 242019的HI气盘厚度
The HI Gas Disk Thickness of the Ultra-diffuse Galaxy AGC 242019
论文作者
论文摘要
超湿星系（UDGS）与矮星系一样微弱，但其大小与螺旋星系相似。已经提出了各种形成机制，其中一些可能导致不同的磁盘厚度。在这项研究中，我们基于其空间分辨的HI气体图测量了AGC 242019的HI量表高度（H_G）和AGC 242019的耀斑（H_G/R）的径向轮廓。 AGC 242019的平均HI尺度高度为<H_G> \ \约537.15 \ pm 89.4 PC，平均耀斑角度为<H_G/R> \ of Boun 0.19 \ pm 0.03。作为比较，我们还得出了14个矮人不规则样品样品的磁盘厚度。发现AGC 242019的HI磁盘与矮人具有可比的厚度。这表明AGC 242019不太可能比矮星系具有更强的恒星反馈，否则这会导致该银河系更厚的磁盘。
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 <h_g> \approx 537.15 \pm 89.4 pc, and the mean flaring angle is <h_g/R> \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.
