标题： 富H I超弥散星系的全局动力学标度关系 显示英文标题

标题： Global dynamic scaling relations of HI-rich ultra-diffuse galaxies

摘要： 星系的恒星量与它们的圆周速度之间的巴尔末-图里-费雪关系（BTFR）已经在从矮星系到巨型星系的各种星系中得到了验证。 最近的研究发现，一些超弥散星系（UDGs）偏离了BTFR，表明存在具有异常动力学特性的星系群体。 然而，这类研究仍局限于样本量较小。 在这项研究中，我们使用了100%完整的阿雷西博遗产快阿雷西博L波段馈源阵列（ALFALFA），调查了88个HI丰富的UDG（HUDG），这是目前具有动力学信息的最大UDG样本。 我们发现HUDGs在BTFR图上形成了一个连续分布，高速度星系在1$\sigma$水平上与正常矮星系一致，低速度星系偏离了BTFR，这与文献中的报告一致。 我们指出，观察到的偏差可能是各种选择效应或系统偏差造成的。 尽管如此，我们发现HUDGs偏离BTFR和TF的关系显著不同，即它们要么偏离BTFR，要么偏离TF。 我们的结果表明，高气相分数可能在解释HUDGs偏离BTFR方面起着重要作用。 显示英文摘要

摘要： The baryonic Tully-Fisher relation (BTFR), which connects the baryonic mass of galaxies with their circular velocities, has been validated across a wide range of galaxies, from dwarf galaxies to massive galaxies. Recent studies have found that several ultra-diffuse galaxies (UDGs) deviate significantly from the BTFR, indicating a galaxy population with abnormal dynamical properties. However, such studies were still confined within a small sample size. In this study, we used the 100% complete Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) to investigate the BTFR of 88 HI-rich UDGs (HUDGs), which is the largest UDG sample with dynamical information. We found that the HUDGs form a continuous distribution in the BTFR diagram, with high-velocity galaxies consistent with normal dwarf galaxies at 1 $\sigma$ level, and low-velocity galaxies deviating from the BTFR, in line with that reported in the literature. We point out that the observed deviation may be subject to various selection effects or systemic biases. Nevertheless, we found that the significance of the deviation of HUDGs from the BTFR and TFR are different, i.e., they either deviate from the BTFR or from the TFR. Our result indicates that a high-gas fraction may play an important role in explaining the deviation of HUDGs from BTFR.