Cosmic Voids in Sloan Digital Sky Survey Data Release 7
Cosmic Voids in Sloan Digital Sky Survey Data Release 7
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DOI：
10.1111/j.1365-2966.2011.20197.x
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发表时间：
2011-03
影响因子：
4.8
通讯作者：
Danny Pan;M. Vogeley;F. Hoyle;Yun-Young Choi;Changbom Park
中科院分区：
文献类型：
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作者：
Danny Pan;M. Vogeley;F. Hoyle;Yun-Young Choi;Changbom Park
我们使用斯隆数字巡天数据第 7 版 (SDSS DR7) 研究宇宙空洞和空洞星系的分布。使用 Hoyle 和 Vogeley (2002) 描述的 VoidFinder 算法，我们在北银河半球识别出 1054 个统计上显着的半径 > 10h 1 Mpc 的空洞。样品体积中空隙的填充率为62%。最大空隙的有效半径仅超过 30h 1 Mpc。中位有效半径为 17h 1 Mpc。发现空隙明显密度不足，空隙边缘的密度对比度≤0.85。这些空隙的径向密度分布类似于引力理论中动态不同的低密度的预测。我们发现空洞内有8046个比Mr=20.09更亮的星系，占星系总数的7%。我们将 SDSS DR7 上的 VoidFinder 结果与 SPH halo 模型模拟以及其他 �-CDM 模拟生成的模拟目录进行比较，并在数据和模拟中发现类似的空隙率和空隙尺寸。该目录可在 http://www.physicals.drexel.edu/�pan/VoidCatalog 上公开下载。
We study the distribution of cosmic voids and void galaxies using Sloan Digital Sky Survey Data Release 7 (SDSS DR7). Using the VoidFinder algorithm as described by Hoyle & Vogeley (2002), we identify 1054 statistically significant voids in the northern galactic hemisphere with radii > 10h 1 Mpc. The filling factor of voids in the sample volume is 62%. The largest void is just over 30h 1 Mpc in effective radius. The median effective radius is 17h 1 Mpc. The voids are found to be significantly underdense, with density contrast � < 0.85 at the edges of the voids. The radial density profiles of these voids are similar to predictions of dynamically distinct underdensities in gravitational theory. We find 8,046 galaxies brighter than Mr = 20.09 within the voids, accounting for 7% of the galaxies. We compare the results of VoidFinder on SDSS DR7 to mock catalogs generated from a SPH halo model simulation as well as other �-CDM simulations and find similar void fractions and void sizes in the data and simulations. This catalog is made publicly available at http://www.physics.drexel.edu/�pan/VoidCatalog for download.