Journal Article

Angular momentum and clustering properties of early dark matter haloes

Andrew J. Davis and Priyamvada Natarajan

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 393, issue 4, pages 1498-1502
Published in print March 2009 | ISSN: 0035-8711
Published online February 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14267.x
Angular momentum and clustering properties of early dark matter haloes

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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 106– 107 M 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, 106 and 107 M, 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.

Keywords: galaxies: formation; galaxies: high-redshift; dark matter; early Universe

Journal Article.  3149 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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