论文标题
关于磁盘星系中弯曲休息的起源
On the origins of up-bending breaks in disk galaxies
论文作者
论文摘要
使用Spitzer 3.6 $μ$ M成像，我们研究了向上弯曲（III型）磁盘断裂的物理和数据驱动的起源。我们对175个以前识别为包含III型断裂的低包装磁盘星系应用了强大的新探测算法，通过将每个星系重新分类（通过我们的新算法）分类（通过我们的新算法）断裂类型，并比较每个结果子组的局部环境。使用三种不同的星系局部密度的度量，我们发现具有延伸外球体（III型）的星系占我们样品中最高密度环境，而具有扩展弯曲（II型）磁盘和对称郊外的持续弯曲的星系占据了最低的密度环境。在最外面的突破中，我们样本中最常见的III型中断的起源是方法论。使用椭圆形孔测量不对称星系的径向曲线通常会导致类似于III型断裂的特征。
Using SPITZER 3.6$μ$m imaging, we investigate the physical and data-driven origins of up-bending (Type III) disk breaks. We apply a robust new break-finding algorithm to 175 low-inclination disk galaxies previously identified as containing Type III breaks, classify each galaxy by its outermost re-classified (via our new algorithm) break type, and compare the local environments of each resulting subgroup. Using three different measures of the local density of galaxies, we find that galaxies with extended outer spheroids (Type IIIs) occupy the highest density environments in our sample, while those with extended down-bending (Type II) disks and symmetric outskirts occupy the lowest density environments. Among outermost breaks, the most common origin of Type III breaks in our sample is methodological; the use of elliptical apertures to measure the radial profiles of asymmetric galaxies usually results in features akin to Type III breaks.
