星系动物园：尘埃带早期型星系是最近富含气体的小型合并的痕迹
Galaxy Zoo: dust lane early-type galaxies are tracers of recent, gas-rich minor mergers
摘要：
我们提出的第二个两篇论文的起源和演化的本地早期型星系展示尘埃功能。我们使用光学和无线电数据来研究这些物体中的活动星系核（AGN）活动的性质，并与精心构造的对照样本进行比较。我们发现尘埃带早型星系比对照样本星系更有可能拥有发射线活动星系核。此外，在尘埃带早期类型中，射电和活动星系核发射线活动有很强的相关性，而在对照样品中则没有。尘埃带早型星系在富环境和贫环境中表现出相同的活动星系核性质分布，暗示了类似的触发机制。相比之下，对于没有灰尘特征的早期类型，情况并非如此。这些发现有力地表明，尘埃带早型星系是在富含气体的合并过程中形成的星暴系统。这些天体中恒星形成和黑洞吸积速率的提高提供了支持这一假设的进一步证据。因此，尘埃带早期类型代表了恒星爆发和静止星系之间的演化阶段。在这些天体中，活动星系核已经被触发，但尚未完全破坏恒星形成所需的气体储存。
英文摘要：
We present the second of two papers concerning the origin and evolution of local early-type galaxies exhibiting dust features. We use optical and radio data to examine the nature of active galactic nucleus (AGN) activity in these objects, and compare these with a carefully constructed control sample. We find that dust lane early-type galaxies are much more likely to host emission-line AGN than the control sample galaxies. Moreover, there is a strong correlation between radio and emission-line AGN activity in dust lane early-types, but not the control sample. Dust lane early-type galaxies show the same distribution of AGN properties in rich and poor environments, suggesting a similar triggering mechanism. By contrast, this is not the case for early-types with no dust features. These findings strongly suggest that dust lane early-type galaxies are starburst systems formed in gas-rich mergers. Further evidence in support of this scenario is provided by enhanced star formation and black hole accretion rates in these objects. Dust lane early-types therefore represent an evolutionary stage between starbursting and quiescent galaxies. In these objects, the AGN has already been triggered but has not as yet completely destroyed the gas reservoir required for star formation.
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