We present the galaxy luminosity functions (LFs) of four Hickson Compact Groups using image data from the Subaru Hyper Suprime-Cam. A distinct dip appeared in the faint-ends of all the LFs at $M_g\sim-12$. A similar dip was observed in the LFs of the galaxy clusters Coma and Centaurus. However, LFs in the Virgo, Hydra, and the field had flatter slopes and no dips. As the relative velocities among galaxies are lower in compact groups than in clusters, the effect of galaxy-galaxy interactions would be more significant in compact groups. The $M_g\sim-12$ dip of compact groups may imply that frequent galaxy-galaxy interactions would affect the evolution of galaxies, and the dip in LF could become a boundary between different galaxy populations.

中文翻译：

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希克森致密群星系光度函数的−12 mag 倾角

我们使用来自斯巴鲁 Hyper Suprime-Cam 的图像数据展示了四个希克森致密群的星系光度函数 (LF)。在 $M_g\sim-12$ 处所有 LF 的微弱末端出现了明显的下降。在彗发星系团和半人马座星系团的 LF 中也观察到了类似的下降。然而，处女座、九头蛇和该领域的 LF 具有更平坦的斜坡且没有倾角。由于星系之间的相对速度在紧密群中比在星系团中低，因此星系-星系相互作用的影响在紧密群中更为显着。致密群的 $M_g\sim-12$ 倾角可能意味着频繁的星系-星系相互作用会影响星系的演化，而 LF 的倾角可能成为不同星系群之间的边界。