A NEWLY FORMING COLD FLOW PROTOGALACTIC DISK, A SIGNATURE OF COLD ACCRETION FROM THE COSMIC WEB
A NEWLY FORMING COLD FLOW PROTOGALACTIC DISK, A SIGNATURE OF COLD ACCRETION FROM THE COSMIC WEB
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新形成的冷流原星系盘，是宇宙网冷吸积的标志
DOI：
10.3847/2041-8205/824/1/l5
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
R. Trainor
中科院分区：
文献类型：
--
作者：
D. C. Martin;M. Matuszewski;P. Morrissey;J. Neill;A. Moore;C. Steidel;R. Trainor
星系是如何从星系际介质（IGM）的气体中形成的，以及如何由IGM的气体提供燃料，仍然是星系形成中未解决的主要问题之一。虽然经典的冷暗物质范式假设星系是由冷却的维里化气体形成的，但最近的理论和数值模拟强调了冷吸积流的重要性-相对冷（T = 104 K）的未受冲击的气体沿着沿着细丝流入暗物质晕，包括热，大质量，高红移晕。这些流动被认为是存款气体和角动量进入环星系介质，导致盘状或环状结构，最终合并成星系形成在周边交叉点。我们先前报道过一个明亮的Lyα发射灯丝，位于类星体HS 1549 +19附近，红移z = 2.843，是由Palomar宇宙网络成像仪发现的。我们现在报告说，这条暗条的明亮部分是一个巨大的（R > 100 kpc）氢气旋转结构，其速度分布与4 × 1012 M的日冕一致。我们称之为“原盘”的外部的轨道时间与维里化时间和宇宙在这个红移处的年龄相当。我们提出，这个原盘只能是最近才由直接来自宇宙网的冷气体形成的。
How galaxies form from, and are fueled by, gas from the intergalactic medium (IGM) remains one of the major unsolved problems in galaxy formation. While the classical Cold Dark Matter paradigm posits galaxies forming from cooling virialized gas, recent theory and numerical simulations have highlighted the importance of cold accretion flows—relatively cool (T ∼ few × 104 K) unshocked gas streaming along filaments into dark matter halos, including hot, massive, high-redshift halos. These flows are thought to deposit gas and angular momentum into the circumgalactic medium resulting in disk- or ring-like structures, eventually coalescing into galaxies forming at filamentary intersections. We earlier reported a bright, Lyα emitting filament near the QSO HS1549+19 at redshift z = 2.843 discovered with the Palomar Cosmic Web Imager. We now report that the bright part of this filament is an enormous (R > 100 kpc) rotating structure of hydrogen gas with a disk-like velocity profile consistent with a 4 × 1012 M⊙ halo. The orbital time of the outer part of the what we term a “protodisk” is comparable to the virialization time and the age of the universe at this redshift. We propose that this protodisk can only have recently formed from cold gas flowing directly from the cosmic web.
DOI：
10.1111/j.1365-2966.2012.21636.x
发表时间：
2012-01
影响因子：
4.8
作者：
S. Codis;C. Pichon;J. Devriendt;A. Slyz;D. Pogosyan;Y. Dubois;T. Sousbie
通讯作者：
S. Codis;C. Pichon;J. Devriendt;A. Slyz;D. Pogosyan;Y. Dubois;T. Sousbie