论文标题
希克森样紧凑型组环境对星系仪的影响
The influence of Hickson-like compact group environment on galaxy luminosities
论文作者
论文摘要
紧凑的星系组被设计为相互作用可能驱动星系进化的极端环境。在这项工作中，我们分析了居住在紧凑型组的星系的亮度是否与松散星系组的星系不同。我们计算了居住在Sloan Digital Sky Survey Data Release 16中的1412个类似希克森的紧凑型星系的新样本的星系人群的光度功能。我们观察到紧凑型组中星系的特征性绝对幅度比在现场或松散的星系系统中更明亮。与松动的系统相比，我们还观察到紧凑型组中微弱星系的缺乏。我们的分析表明，亮度主要是由于居住在较大的紧凑型基团的星系所致。与在松散系统中观察到的相反，只有红色（和早期）星系的亮度表现出与群体质量相关的依赖性，紧凑型组中红色和蓝色（也是早期和晚期）星系的亮度与群体病毒质量的函数相似。当使用哈勃类型时，我们观察到紧凑型组中的椭圆星系是最明亮的星系人群，并且由椭圆星系主导的组也显示出与螺旋星系主导的椭圆形的亮度。此外，我们表明可以使用从星系形成的半分析模型获得的模拟目录来复制一般的光度趋势。这些结果表明，紧凑型组的内部极端环境促使其星系的进化史不同。
Compact groups of galaxies are devised as extreme environments where interactions may drive galaxy evolution. In this work, we analysed whether the luminosities of galaxies inhabiting compact groups differ from those of galaxies in loose galaxy groups. We computed the luminosity functions of galaxy populations inhabiting a new sample of 1412 Hickson-like compact groups of galaxies identified in the Sloan Digital Sky Survey Data Release 16. We observed a characteristic absolute magnitude for galaxies in compact groups brighter than that observed in the field or loose galaxy systems. We also observed a deficiency of faint galaxies in compact groups in comparison with loose systems. Our analysis showed that the brightening is mainly due to galaxies inhabiting the more massive compact groups. In contrast to what is observed in loose systems where only the luminosities of Red (and Early) galaxies show a dependency with group mass, luminosities of Red and Blue (also Early and Late) galaxies in compact groups are affected similarly as a function of group virial mass. When using Hubble types, we observed that Elliptical galaxies in compact groups are the brightest galaxy population, and groups dominated by an Elliptical galaxy also display the brightest luminosities in comparison with those dominated by Spiral galaxies. Moreover, we show that the general luminosity trends can be reproduced using a mock catalogue obtained from a semi-analytical model of galaxy formation. These results suggest that the inner extreme environment in compact groups prompts a different evolutionary history for their galaxies.
