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(LCBG)是一个以高光度、蓝色和高表面亮度为特征的不同类型的星系,位于星系从蓝色向红色演化的关键时刻。作为我们的本地LCBG的多波长调查的一部分,我们一直在研究这些星系的HI内容使用单碟望远镜和干涉仪。我们的目标是确定是否单盘HI观测代表LCBG的动力学质量的真实测量,并寻找可能触发LCBG中恒星形成的最近相互作用的签名。我们的数据表明,虽然一些LCBG正在发生相互作用,但许多LCBG似乎是孤立的。虽然所有的LCBG包含HI和旋转的签名,人口不在于塔利-费舍尔关系,也不能演变到it. Further,HI地图的许多LCBG动态热组件的签名,这表明我们看到了一个厚盘或球体的形成,至少在一些LCBG。有很好的协议之间的HI和H-alpha运动LCBGs,都是类似的外观,高红移恒星形成星系的H-alpha运动。我们的综合数据表明,在LCBG的恒星形成主要是淬火维里加热,与模型预测一致。
英文摘要:
Luminous compact blue galaxies (LCBGs) are a diverse class of galaxies characterized by high luminosity, blue color, and high surface brightness that sit at the critical juncture of galaxies evolving from the blue to the red sequence. As part of our multi-wavelength survey of local LCBGs, we have been studying the HI content of these galaxies using both single-dish telescopes and interferometers. Our goals are to determine if single-dish HI observations represent a true measure of the dynamical mass of LCBGs and to look for signatures of recent interactions that may be triggering star formation in LCBGs. Our data show that while some LCBGs are undergoing interactions, many appear isolated. While all LCBGs contain HI and show signatures of rotation, the population does not lie on the Tully-Fisher relation nor can it evolve onto it. Furthermore, the HI maps of many LCBGs show signatures of dynamically hot components, suggesting that we are seeing the formation of a thick disk or spheroid in at least some LCBGs. There is good agreement between the HI and H-alpha kinematics for LCBGs, and both are similar in appearance to the H-alpha kinematics of high redshift star-forming galaxies. Our combined data suggest that star formation in LCBGs is primarily quenched by virial heating, consistent with model predictions.
机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。