论文标题
RedShift $ Z = 0.76 $的巨型中央红色磁盘银河系：挑战银河系理论
A giant central red disk galaxy at redshift $z=0.76$: challenge to theories of galaxy formation
论文作者
论文摘要
我们报告了XMM-LSS北部地区的一个巨大的红色中央磁盘星系。该区域覆盖着丰富的多体光度和光谱观测。使用加拿大 - 弗朗西 - 哈瓦伊望远镜遗产调查（CFHTLS）的光度数据和Baryon振荡光谱调查（BOSS）的光谱观察，我们发现银河系具有$ \ sim 10^{11.6} $ solar Mose Mose $ m_ $ m_ \ m_ \ m_ \ m_ \ m_ \ odot的$ \ sim 10^{11.6} $。银河系具有红色，并具有旧的恒星种群，因此其恒星形成已经停止。随着超级表板（HSC）Subaru战略计划的光度图像数据，我们证明其光度曲线由$ n = 1.22 $的Sérsic形式完美地描述，表明磁盘形态。我们还根据VIMOS公共外层次红移调查（Vipers）光度目录分析其环境，并发现其近邻的邻居都不那么大，这表明我们观察到的星系位于其宿主光晕的中心。巨型红色中央磁盘星系的存在严重挑战了当前星系形成的标准范式，因为没有已知的物理机制可以解释其恒星形成的淬火。该结论得到了银河形成的最新水动力模拟的支持。
We report a giant red central disk galaxy in the XMM-LSS north region. The region is covered with a rich variety of multiband photometric and spectroscopic observations. Using the photometric data of the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) and spectroscopic observation of the Baryon Oscillation Spectroscopic Survey (BOSS), we find that the galaxy has a stellar mass of $\sim 10^{11.6}$ times of the solar mass $M_\odot$. The galaxy has a red color and has an old stellar population, and thus its star formation has stopped. With the photometric image data of Hyper Suprime-Cam (HSC) Subaru Strategic Program, we demonstrate that its luminosity profile is perfectly described by a Sérsic form with $n=1.22$ indicating disk morphology. We also analyze its environment based on the VIMOS Public Extragalactic Redshift Survey (VIPERS) photometric catalog, and find that its close neighbors are all less massive, indicating that our observed galaxy is sitting at the center of its host halo. Existence of the giant red central disk galaxy seriously challenges the current standard paradigm of galaxy formation, as there is no known physical mechanism to explain the quenching of its star formation. This conclusion is supported by state-of-the-art hydrodynamical simulations of galaxy formation.
