宇宙大尺度结构空洞的演化研究
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(1.中国科学院紫金山天文台星系宇宙学与暗能量实验室南京210034;2.中国科学技术大学天文与空间科学学院南京210034)

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国家自然科学基金项目(11273061、11673065), 国家重点基础研究发展计划项目(2015CB857002、2015CB80753)资助


The Evolution of Cosmic Void
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1. Laboratory of Galaxy Cosmology and Dark Energy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210034;2. School of Astronomy and Space Science, University of Science and Technology of China, Nanjing 210034 ;

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    摘要:

    为了研究空洞的演化以及暗物质空洞和星系空洞的差别, 使用一组高精度的N体模拟数据以及基于此给出的半解析模拟星系数据, 在红移2.03到红移0之间取了6个红移的数据, 并使用VIDE (Void Identification and Examination toolkit)算法来找空洞, 对星系空洞和暗物质空洞的统计性质比如丰度、数目、大小、形状、叠加密度轮廓等演化的比较的结果表明, 随着红移的减小, 空洞的数目逐渐减少、内部密度逐渐变小、体积逐渐增大、空洞的形状越来越扁. 暗物质空洞和星系空洞的数目、平均大小、平均椭率的比值与红移呈线性关系. 此外, 不论是暗物质空洞还是星系空洞, 小的空洞密度比在分布上比大空洞的低, 更容易贯通并合, 演化效应更明显. 另外由于星系总是形成于暗物质密度场的高密度区域, 使其不容易示踪暗物质空洞的一些薄弱的墙结构, 导致星系空洞提前贯通. 而对于已经形成的星系空洞而言, 即便是其墙上最薄弱的地方也往往堆积着显著的暗物质, 使得星系的位置保持稳定, 甚至形成新的星系, 从而抑制星系空洞的贯通. 整体上暗物质空洞的演化要比星系空洞的演化更加明显.

    Abstract:

    In order to study the evolution of cosmic void and the differences between galaxy void and dark matter void with a suite of high-resolution N-body simulations and mock galaxies produced by a semi-analytic model, we use the method of void finder without watershed transforming VIDE (Void Identification and Examination toolkit) and identify the voids in 6 snapshots from $z =$ 2.03 to 0. For each void sample, the statistical properties of void evolution from DM (dark matter) voids and galaxy voids are investigated, respectively. Compared the relative differences such as abundance, number, shape, effective radius, stacked density profile, the results show that the number of voids decreases gradually with redshift, the internal density of void becomes deeper, the volume increases, and the shape of voids tends to be more elliptical. The ratios of void statistical properties such as void number, mean effective radius, mean ellipticity of dark matter void to those of galaxy voids show a linear relation with redshift. Moreover, the density contrast of small voids tends to be lower than that of the large ones for both population of tracers, which makes small voids easily to merge and evolve more violently. Due to that galaxies always follow the high-density region of dark matter field, galaxies can not accurately trace the weak wall structures of dark matter voids which makes galaxy voids merge more easily than dark matter voids. For the galaxy voids, the surrounding dark matter density tends to be very high even at the weakest position at the ridge of void, which not only keeps the position of galaxy stable but also likely triggers the formation of new galaxies at late time, thus suppresses the merging of galaxy voids, and our results show that dark matter voids evolve more violently than galaxy voids.

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赵飞,罗煜,韦成亮.宇宙大尺度结构空洞的演化研究[J].天文学报,2019,60(4):87-102.

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  • 收稿日期:2019-02-26
  • 最后修改日期:2019-04-24
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  • 在线发布日期: 2019-09-12
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