Angular momentum and clustering properties of early dark matter haloes

作者：Davis Andrew J^*; Natarajan Priyamvada

来源：Monthly Notices of the Royal Astronomical Society, 2009, 393(4): 1498-1502.

DOI：10.1111/j.1365-2966.2008.14267.x

• galaxies: formation
• galaxies: high-redshift
• dark matter
• early Universe

In this paper, we study the angular momentum properties of simulated dark matter haloes at high redshifts that likely host the first stars in the Universe. Calculating the spin distributions of these 10(6) - 10(7) M(circle dot) haloes in redshift slices from z = 15 to 6, we find that they are well fit by a lognormal distribution as is found for lower redshift and more massive haloes in earlier work. We find that both the mean value of the spin and dispersion are largely unchanged with redshift for all haloes. Our key result is that subsamples of low- and high-spin, 10(6) and 10(7) M(circle dot), haloes show difference in clustering strength. In both mass bins, higher spin haloes are more strongly clustered in concordance with a tidal torquing picture for the growth of angular momentum in dark matter haloes in the cold dark matter paradigm.

• 出版日期2009-3-11