超扩散星系AGC 242019中的浅暗物质晕：UDG在结构上与低表面亮度星系相似吗？
A shallow dark matter halo in Ultra Diffuse Galaxy AGC 242019: are UDGs structurally similar to low surface brightness galaxies?
摘要：
关于超扩散星系（UDG）的一个中心问题是它们是否是低表面亮度（LSB）星系的一个单独类别，或者只是它们向低恒星质量的自然延续。在这封信中，我们表明，丰富的气体UDG AGC 242019的旋转曲线是很好的拟合的暗物质晕与内斜率渐近线到-0.54，这样的拟合提供了一个浓度参数，符合理论预期。这一发现，与以前的作品中，浅内轮廓来自UDG，表明这些星系的结构特性像其他观察到的LSB。UDG显示出缓慢上升的旋转曲线，这有利于形成的情况下，内部过程，如SNae驱动的气体流出，正在修改UDG配置文件。
英文摘要：
A central question regarding Ultra Diffuse Galaxies (UDGs) is whether they are a separate category to Low Surface Brightness (LSB) galaxies, or just their natural continuation towards low stellar masses. In this letter, we show that the rotation curve of the gas rich UDG AGC 242019 is well fit by a dark matter halo with inner slope that asymptotes to -0.54, and that such fit provides a concentration parameter that matches theoretical expectations. This finding, together with previously works in which shallow inner profiles are derived for UDGs, shows that the structural properties of these galaxies are like other observed LSBs. UDGs show slowly rising rotation curves and this favours formation scenarios in which internal processes, such as SNae driven gas outflows, are acting to modify UDGs profiles.
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