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THE EFFECT OF ENVIRONMENT ON GALAXY INTERACTIONS

机译：环境对银河相互作用的影响

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We have investigated the effect of environment on the interaction rate of galaxies in the local universe using data drawn from the Las Campanas Redshift Survey. This data set consists of galaxies inhabiting the entire range of galactic environments, from the sparsest field to the densest clusters, thus allowing us to study environmental variations without combining multiple data sets with inhomogeneous character- istics. The interactions of the sample galaxies are characterized by the asymmetry of galactic light and the existence of apparent close companions, while the environment of the galaxies is characterized both by the three-space local galaxy density and by membership in groups and clusters, in order to illustrate the possible differential influences of various environmental scales. We find that existence of apparent companions and the distortions of galaxies are influenced differ- ently by the surrounding environments. (1) Existence of the apparent close companions seems to be sen- sitive to both the local galaxy density and membership in association, which is sensitive to the environment on a larger scale than the local galaxy density. However, the sensitivity to the local density is generally low, while that to the membership is higher in some cases. In particular, galaxies with com- panions are distinctively more abundant in poor clusters than in the field. On the other hand, the rich cluster/field comparison shows no environmental effects. (2) For the case of the distortions, a comparison of the population ratio in the high- and low-density subsets shows that distorted galaxies are slightly more prevalent in the high-density environment. The effect is somewhat stronger for highly distorted galaxies than moderately disturbed ones. However, the “membership” comparison reveals no significant effect of clustering on the incidence of distorted galaxies. Our results show that interactions of galaxies (characterized by the distortions of galaxies and the existence of apparent companions) are influenced by the surrounding environments. The degree of the influence varies, however, depending on the measure we have used for characterizing the interactions. The degree of the influence also varies from weak to strong interactions. Generally, the stronger inter- acting measures show stronger correlations with the environments than the weak measures, which show weak or marginal trends. Our results on the environmental dependence of interaction are consistent with the environmental variation of strong star formation investigated in our previous study, which used the same data set and similar analyses, supporting the popular understanding of the importance of interactions on the occurrence of strong star-forming activities. j
机译：我们使用拉斯坎帕纳斯（Las Campanas）红移调查得出的数据，研究了环境对当地宇宙中星系相互作用速率的影响。该数据集由居住在整个银河环境范围的星系组成，从最稀疏的田野到最密集的星团，因此使我们能够研究环境变化，而无需将多个数据集与不均匀的特征结合在一起。样本星系的相互作用以星系光的不对称性和明显的近伴的存在为特征，而星系的环境既以三空间局部星系密度为特征，又以成群和成簇的成员为特征。说明了各种环境规模可能产生的不同影响。我们发现明显的同伴的存在和星系的畸变受到周围环境的不同影响。 （1）明显的近伴的存在似乎对本地星系密度和关联成员均敏感，这比本地星系密度对环境更敏感。但是，对局部密度的敏感性通常较低，而在某些情况下，对隶属度的敏感性较高。特别是，在较差的星团中，具有同伴的星系比野外的星系更为丰富。另一方面，丰富的群集/字段比较显示没有环境影响。 （2）对于畸变情况，高密度和低密度子集中的人口比率比较表明，畸变星系在高密度环境中更为普遍。对于高度畸变的星系，其影响要比中度受扰的星系更强。但是，“成员资格”比较没有显示聚类对扭曲星系的发生率没有显着影响。我们的研究结果表明，星系的相互作用（以星系的畸变和明显的伴星的存在为特征）受周围环境的影响。但是，影响的程度会有所不同，具体取决于我们用于描述交互作用的度量。影响程度也从弱互动到强互动不等。通常，较强的交互作用措施与环境之间的相关性要强于较弱的措施，后者表现出弱的或边缘的趋势。我们对相互作用的环境依赖性的研究结果与我们先前研究中研究的强恒星形成的环境变化相一致，后者使用相同的数据集和类似的分析，支持了人们对相互作用对强恒星发生的重要性的普遍理解。形成活动。 Ĵ

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