论文标题
环形星系的光度函数
The luminosity function of ringed galaxies
论文作者
论文摘要
我们使用Sloan Digital Sky Survey（SDSS）的数据对两种类型的环形星系和碰撞环星系的光度函数（LFS）进行分析。两类星系都是与环境相互作用的结果，它们是非常罕见的物体。我们通过不同的方法构建了星系的LF，并通过Schechter函数找到了它们的近似值。两种类型星系的光度函数在低亮度下显示出系统的损失。明亮（$ m_r \ leq -20^m $）和红色（$ g -r> +0.8 $）星系周围的极性结构大约是蓝色周围的两倍。与极性星系相比，碰撞环的LF朝着更明亮的亮度转移。我们分析了有关在几个深字段中的环形星系的发布数据，并通过红移（Redshift：z $ \ sim 1 $ 1）确认其量密度的增加，它们的密度将其密度增长为$（1+z）^m $，其中$ m \ gtrsim 5 $。
We perform an analysis of the luminosity functions (LFs) of two types of ringed galaxies -- polar-ring galaxies and collisional ring galaxies -- using data from the Sloan Digital Sky Survey (SDSS). Both classes of galaxies were formed as a result of interaction with their environment and they are very rare objects. We constructed LFs of galaxies by different methods and found their approximations by the Schechter function. The luminosity functions of both types of galaxies show a systematic fall-off at low luminosities. The polar structures around bright ($M_r \leq -20^m$) and red ($g-r > +0.8$) galaxies are about twice as common as around blue ones. The LF of collisional rings is shifted towards brighter luminosities compared to polar-ring galaxies. We analysed the published data on the ringed galaxies in several deep fields and confirmed the increase in their volume density with redshift: up to z$\sim$1 their density grows as $(1+z)^m$, where $m \gtrsim 5$.
