The Influence of Redshift Space Distortion on the Cosmic Voids |
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| Institution: | 1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;3. National Basic Discipline Public Science Data Center, Beijing 100190;1. Beijing Planetarium, Beijing 100044 China;2. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101 China;3. Space Debris Observation and Data Application Center, China National Space Administration, Beijing 100101 China;4. Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023 China;5. Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094 China;6. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049 China;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023 China;2. Laboratory of Space Object and Debris Observation, Chinese Academy of Sciences, Nanjing 210023 China;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210023;3. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026 |
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| Abstract: | In order to investigate redshift space distortion effect on voids, VIDE (Void Identification and Examination toolkit) algorithm is used to find cosmic voids in real space and redshift space based on a mock galaxy catalog produced by the semi-analytical galaxy formation model. The voids can be divided into “collapsed” type and “expanded” type, according to the galaxy velocity on the void wall. The results show that the fraction of the “collapsed” voids decrease as the voids’ size grows, while “expanded” voids are contrary. The effective radius of two type voids differs by 20% in real space, and the mean radial density profile of “collapsed” voids is significant higher than that of “expanded” voids. Using the member galaxies to match the voids in two spaces, the comparison of the voids’ number distributions of two spaces shows that the difference of voids’ number between them is related to the voids’ size, and half of the voids in redshift space can not matched to the voids in real space. For the matched voids, the redshift space distortion has stronger effect on the density profile of the “collapsed” voids. For the unmatched ones, their density profile is clearly different, and the infall movement of galaxies on their shell is more obvious in real space. |
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