论文标题
关于在处女座上的一组新星系的积聚：I。九个室内的内部运动学
On the accretion of a new group of galaxies onto Virgo: I. Internal kinematics of nine in-falling dEs
论文作者
论文摘要
星系环境已被证明在将晚期类型的星形星系转换为静态球体方面起着重要作用。对于低质量星系（M <$ 10^{10} $ \（m_ \ odot \）），这种转换预计将更加严重，这主要是由于他们过去的宿主光环（也称为预处理）的影响，主要是由于他们过去的宿主光环的影响。在这项研究中，我们首次研究了9个早期型矮星系（DES）的样本，这些样本被作为一个可能结合的基团，大约2-3 Gyr被吸收到处女座星系群。考虑到这种特殊条件，这9个DES可能会提供一个测试床，以区分处女座星系簇的影响以及先前宿主光环对其当前性质的影响。具体来说，我们使用VLT/MUSE Integrallient单元光谱来得出其运动学和特定的角动量（$λ_{r} $）配置文件。我们观察到我们样本des的$λ_{r} $配置文件中的差异，发现其中一半的$λ_{r} $配置文件与低质量场星系的概况高。其余的des展品$λ_{r} $概要文件与以前很可能会产生的处女座des的概况。此外，我们在一个DE中检测到具有气速偏移的一个DE，这表明处女座中的气体剥离。我们建议在我们的样本中的低$λ_{r} $ des是由他们以前的主机光环（在其注入处女座之前）处理的。
Galaxy environment has been shown to play an important role in transforming late-type, star-forming galaxies to quiescent spheroids. This transformation is expected to be more severe for low-mass galaxies (M < $10^{10}$ \(M_\odot\)) in dense galaxy groups and clusters, mostly due to the influence of their past host halos (also known as pre-processing) and their present-day environments. For the first time, in this study, we investigate a sample of nine early-type dwarf galaxies (dEs) that were accreted as a likely bound group onto the Virgo galaxy cluster about 2-3 Gyr ago. Considering this special condition, these nine dEs may provide a test bed for distinguishing between the influence of the Virgo galaxy cluster and the effects of the previous host halo on their current properties. Specifically, we use VLT/MUSE integral-field unit spectra to derive their kinematics and specific angular momentum ($λ_{R}$) profiles. We observe a spread in the $λ_{R}$ profiles of our sample dEs, finding that the $λ_{R}$ profiles of half of them are as high as those of low-mass field galaxies. The remaining dEs exhibit $λ_{R}$ profiles as low as those of Virgo dEs that were likely accreted longer ago. Moreover, we detect nebular emission in one dE with a gas velocity offset suggesting ongoing gas stripping in Virgo. We suggest that the low-$λ_{R}$ dEs in our sample were processed by their previous host halo, prior to their infall to Virgo, and that the high-$λ_{R}$ dEs may be experiencing ram pressure stripping in Virgo.
