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Published 2009 | Published
Book Section - Chapter Open

Comparison Between Simulated and Observational Results of Galaxy Formation for Large Scale Structures


The Millennium simulation is the largest numerical simulation of how minor fluctuations in the density of the universe's dark matter distribution are amplified by gravity to develop into the large scale structures(LSS) and galaxy clusters seen today(Springel et al. 2005). Although the simulations have been compared with the astronomical observations of the local universe, the simulations have not been widely compared with high redshift, early universe observations. In our study we compare the simulation data(Wang et al. 2008; Guo et al. 2008(in preparation)) for the first time with observations from the COSMOS survey(Scoville et al. 2006). Three quantities are proposed to characterize the structures and the structures distribution, namely the percent area occupied by LSS at each redshift, the average area of LSS and the shapes as characterized by the square root of the area divided by the circumference. We calculate these quantities for both the observations and the simulations, and quantify discrepancies between the existing simulations and observations. In particular, the simulations exhibit earlier development of dense structures than is seen in the observational data.

Additional Information

© 2009 Astronomical Society of the Pacific. Thanks Qi Guo for providing the simulation data.

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Published - Li2009p11359Starburst-Agn_Connection.pdf


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August 20, 2023
January 13, 2024