论文标题
角动量和环境对晚期星系的HI气体的影响
The influence of angular momentum and environment on the HI gas of late-type galaxies
论文作者
论文摘要
我们使用Whisp调查中的高分辨率HI数据来研究114个晚期星系样品的HI和角动量特性。我们探索了特定的重型角度动量 - baryonic质量（$ j_b -m_b $）关系，发现形式的$ j_b \ propto m_b^{0.55 \ pm 0.02} $的不间断的功率定律非常适合数据，并具有$ \ sim 0.13 \ sim 0.13 \ pm pm 0.01 $ 0.01 $ dex。我们重新审视原子气体分数，$ f_ {atm} $和集成的原子稳定性参数$ q $（$ f_ {atm} - q $关系），由Obreschkow等人介绍，并由该参数与其他环境相处，并通过$ j的$ j_来探测该参数，$ j_ $ j_，$ jb，$ jb，$ jb，$ jb和$ Q $值。我们发现有证据表明，与没有近距离的星系相比，与$ f_ {atm} - q $关系的星系显示出更大的内在散布。我们还发现与邻居偏离的星系中的SFR增强了。此外，我们将凸起的（b/t）比作为形态代理，并找到了b/t值降低的一般趋势，而$ f_ {atm} - q $平面中的盘稳定性和HI分数的增加，表明质量，特定的角动量，气体分数和人星系的形态之间的基本联系。
We use high-resolution HI data from the WHISP survey to study the HI and angular momentum properties of a sample of 114 late-type galaxies. We explore the specific baryonic angular momentum -- baryonic mass ($j_b - M_b$) relation, and find that an unbroken power law of the form $j_b \propto M_b^{0.55 \pm 0.02}$ fits the data well, with an intrinsic scatter of $\sim 0.13 \pm 0.01$ dex. We revisit the relation between the atomic gas fraction, $f_{atm}$, and the integrated atomic stability parameter $q$ (the $f_{atm} - q$ relation), originally introduced by Obreschkow et al., and probe this parameter space by populating it with galaxies from different environments, in order to study the influence of the environment on their $j_b$, $f_{atm}$ and $q$ values. We find evidence that galaxies with close neighbours show a larger intrinsic scatter about the $f_{atm} - q$ relation compared to galaxies without close-neighbours. We also find enhanced SFR among the deviating galaxies with close neighbours. In addition, we use the bulge-to-total (B/T) ratio as a morphology proxy, and find a general trend of decreasing B/T values with increasing disc stability and HI fraction in the $f_{atm} - q$ plane, indicating a fundamental link between mass, specific angular momentum, gas fraction and morphology of galaxies.
