发光致密蓝星系的演化：椭球还是球体？
The Evolution of Luminous Compact Blue Galaxies: Disks or Spheroids?
摘要：
亮致密蓝星系（Luminous Compact Blue Galaxies，LCBG）是一种以高光度、蓝色和高表面亮度为特征的星系。LCBG位于蓝色序列的高光度、高质量端，处于星系从蓝色序列向红色序列演化的关键时刻。然而，我们不明白是什么推动了LCBG的演变，也不知道它们将如何演变。基于单碟HI观测，我们知道它们具有多种性质。LCBG富含HI，M（HI）=10^{9-10.5} M（太阳），具有中等M（dyn）=10^{10-12} M（太阳），80%的气体耗尽时间尺度小于3 Gyr。这些性质与LCBG演化成低质量螺旋星系或高质量矮椭圆星系或矮不规则星系是一致的。然而，LCBG不遵循塔利-费舍尔关系，也不能演变到它，这意味着许多LCBG不是平滑旋转，维里化系统。GMRT和VLA HI地图证实了这一结论，揭示了最近的相互作用和动态热组件在一些本地LCBG的签名，形成厚盘或球体一致。这样的特征和LCBG周围亲密同伴的高发生率表明，局部LCBG中的恒星形成可能是由相互作用引发的。动力学质量和明显的球状体形成LCBGs结合以前的结果，从光学光谱是一致的维里加热淬火在这些星系中的恒星形成的主要机制。
英文摘要：
Luminous compact blue galaxies (LCBGs) are a diverse class of galaxies characterized by high luminosities, blue colors, and high surface brightnesses. Residing at the high luminosity, high mass end of the blue sequence, LCBGs sit at the critical juncture of galaxies that are evolving from the blue to the red sequence. Yet we do not understand what drives the evolution of LCBGs, nor how they will evolve. Based on single-dish HI observations, we know that they have a diverse range of properties. LCBGs are HI-rich with M(HI)=10^{9-10.5} M(sun), have moderate M(dyn)=10^{10-12} M(sun), and 80% have gas depletion timescales less than 3 Gyr. These properties are consistent with LCBGs evolving into low-mass spirals or high mass dwarf ellipticals or dwarf irregulars. However, LCBGs do not follow the Tully-Fisher relation, nor can most evolve onto it, implying that many LCBGs are not smoothly rotating, virialized systems. GMRT and VLA HI maps confirm this conclusion revealing signatures of recent interactions and dynamically hot components in some local LCBGs, consistent with the formation of a thick disk or spheroid. Such signatures and the high incidence of close companions around LCBGs suggest that star formation in local LCBGs is likely triggered by interactions. The dynamical masses and apparent spheroid formation in LCBGs combined with previous results from optical spectroscopy are consistent with virial heating being the primary mechanism for quenching star formation in these galaxies.
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