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A giant protogalactic disk linked to the cosmic web

机译：链接到宇宙网的巨大的原银河系磁盘

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The specifics of how galaxies form from, and are fuelled by, gas from the intergalactic medium remain uncertain. Hydrodynamic simulations suggest that 'cold accretion flows'-relatively cool (temperatures of the order of 104 kelvin), unshocked gas streaming along filaments of the cosmic web into dark-matter halos(1-3)-are important. These flows are thought to deposit gas and angular momentum into the circumgalactic medium, creating disk-or ring-like structures that eventually coalesce into galaxies that form at filamentary intersections(4,5). Recently, a large and luminous filament, consistent with such a cold accretion flow, was discovered near the quasi-stellar object QSO UM287 at redshift 2.279 using narrow-band imaging(6). Unfortunately, imaging is not sufficient to constrain the physical characteristics of the filament, to determine its kinematics, to explain how it is linked to nearby sources, or to account for its unusual brightness, more than a factor of ten above what is expected for a filament. Here we report a two-dimensional spectroscopic investigation of the emitting structure. We find that the brightest emission region is an extended rotating hydrogen disk with a velocity profile that is characteristic of gas in a darkmatter halo with a mass of 10(13) solar masses. This giant protogalactic disk appears to be connected to a quiescent filament that may extend beyond the virial radius of the halo. The geometry is strongly suggestive of a cold accretion flow.
机译：来自星系间介质的气体如何形成星系并由其提供燃料的细节仍然不确定。流体动力学模拟表明，“冷积流”相对较凉（温度为104开尔文），未冲击的气体沿着宇宙纤维网的细丝流到暗物质晕（1-3）中很重要。这些流动被认为是将气体和角动量沉积到了绕银河系的介质中，形成了盘状或环状结构，最终聚结成在丝状相交处形成的星系（4,5）。最近，使用窄带成像法在准星体QSO UM287附近的红移2.279发现了一条与这种冷积流一致的大而发光的灯丝（6）。不幸的是，成像不足以限制灯丝的物理特性，确定其运动学，解释其与附近光源的联系或解释其异常亮度，其亮度比预期的要高十倍。灯丝。在这里，我们报告了发射结构的二维光谱研究。我们发现最亮的发射区域是一个扩展的旋转氢盘，其速度分布是质量为10（13）太阳质量的暗物质晕圈中气体的特征。这个巨大的原银河系盘似乎与可能延伸超过光环病毒半径的静态细丝相连。该几何形状强烈暗示着冷积流。

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  • 来源
    《Nature》 |2015年第7564期|192-195|共4页
  • 作者

    Martin D. Christopher; Matuszewski Mateusz; Morrissey Patrick; Neill James D.; Moore Anna; Cantalupo Sebastiano; Prochaska J. Xavier; Chang Daphne;

  • 作者单位

    CALTECH, Cahill Ctr Astrophys, Pasadena, CA 91125 USA;

    CALTECH, Cahill Ctr Astrophys, Pasadena, CA 91125 USA;

    CALTECH, Cahill Ctr Astrophys, Pasadena, CA 91125 USA;

    CALTECH, Cahill Ctr Astrophys, Pasadena, CA 91125 USA;

    CALTECH, Cahill Ctr Astrophys, Caltech Opt Observ, Pasadena, CA 91125 USA;

    ETH, Inst Astron, CH-8093 Zurich, Switzerland;

    Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA|Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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