论文标题
处女座簇周围的宇宙丝中星系的特性
Properties of Galaxies in Cosmic Filaments around the Virgo Cluster
论文作者
论文摘要
我们使用NASA-Sloan Atlas目录介绍了处女座簇周围细丝中星系的性质。细丝主要由低质量的蓝矮星系组成。我们观察到星系的G -R颜色变为蓝色，而恒星质量随着垂直丝距离的增加而减小。将星系分为高质量（log H^2m_*> 8）和低质量（log H^2m_* <8）子样本。我们还检查了G -R颜色，恒星质量，Halpha等效宽度（EW（HALPHA）），近硫酸盐（NUV） - r颜色和两个子样本的HI分数分布相对于垂直距离。低质量星系表现出负G -R颜色梯度，而较高质量的星系具有平坦的G -R颜色分布。我们观察到高质量星系的负EW（HALPHA）梯度，而低质量星系没有明显的EW（HALPHA）变化。相比之下，高质量星系的NUV -R颜色分布没有强烈的趋势，而低质量星系显示为负nuv -r颜色梯度。我们没有见证高质量或下质量子样本中HI分数的清晰梯度。我们建议，可以通过在不同垂直丝距离的过去星系合并的质量组装来解释星系的负颜色和恒星质量梯度。此外，Galaxy相互作用可能是EW（HALPHA）和NUV-R颜色分布之间的对比度和下质量子类样本之间的对比特征。两个子样本的HI分数分布表明，在处女座细丝中，Ram压力剥离和气体积聚可能是可忽略的过程。
We present the properties of galaxies in filaments around the Virgo cluster with respect to their vertical distance from the filament spine using the NASA-Sloan Atlas catalog. The filaments are mainly composed of low-mass, blue dwarf galaxies. We observe that the g - r color of galaxies becomes blue and stellar mass decreases with increasing vertical filament distance. The galaxies were divided into higher-mass (log h^2M_* > 8) and lower-mass (log h^2M_* < 8) subsamples. We also examine the g - r color, stellar mass, Halpha equivalent width (EW(Halpha)), near-ultraviolet (NUV) - r color, and HI fraction distributions of the two subsamples against the vertical distance. The lower-mass galaxies exhibit a negative g - r color gradient, whereas higher-mass galaxies have a flat g - r color distribution. We observe a negative EW(Halpha) gradient for higher-mass galaxies, whereas lower-mass galaxies show no distinct EW(Halpha) variation. In contrast, the NUV - r color distribution of higher-mass galaxies shows no strong trend, whereas the lower-mass galaxies show a negative NUV - r color gradient. We do not witness clear gradients of HI fraction in either the higher- or lower-mass subsamples. We propose that the negative color and stellar mass gradients of galaxies can be explained by mass assembly from past galaxy mergers at different vertical filament distances. In addition, galaxy interactions might be responsible for the contrasting features of EW(Halpha) and NUV - r color distributions between the higher- and lower-mass subsamples. The HI fraction distributions of the two subsamples suggest that ram-pressure stripping and gas accretion could be ignorable processes in the Virgo filaments.
