论文标题
矮星系可观察参数的演变
Evolution of dwarf galaxy observable parameters
论文作者
论文摘要
我们提出了一个半分析模型的分离矮星系演化，并使用它来研究矮星系性能之间观察到的相关性的构建。我们使用平均和单个光晕质量组装历史的模型分析了进化，以确定随机性对矮星系当前特性的重要性。该模型具有一些自由参数，但是当使用光晕质量质量质量和恒星质量金属关系对其进行校准时，结果与其他观察到的矮星系性能一致。红移进化表明，即使是孤立的星系在哈勃时间中也发生了显着变化，并且具有等同于高红移类似物的特性的“化石矮星系”在本地宇宙中应该极为罕见或不存在。大多数Galaxy属性相关的休息时间会随着时间的流逝而发展，在出色的质量$ m_* \ simeq 10^7 m_ \ odot $中。它主要由电离背景辐射引起，因此可以原则上用于限制电离的特性。
We present a semi-analytic model of isolated dwarf galaxy evolution and use it to study the build-up of observed correlations between dwarf galaxy properties. We analyse the evolution using models with averaged and individual halo mass assembly histories in order to determine the importance of stochasticity on the present-day properties of dwarf galaxies. The model has a few free parameters, but when these are calibrated using the halo mass - stellar mass and stellar mass-metallicity relations, the results agree with other observed dwarf galaxy properties remarkably well. Redshift evolution shows that even isolated galaxies change significantly over the Hubble time and that 'fossil dwarf galaxies' with properties equivalent to those of high-redshift analogues should be extremely rare, or non-existent, in the Local Universe. A break in most galaxy property correlations develops over time, at a stellar mass $M_* \simeq 10^7 M_\odot$. It is caused predominantly by the ionizing background radiation and can therefore in principle be used to constrain the properties of reionization.
