Axions and the galactic angular momentum distribution
نویسندگان
چکیده
منابع مشابه
Axions and Their Distribution in Galactic Halos
Axion physics is briefly reviewed. Constraints from laboratory searches, astrophysics and cosmology require the axion mass to be in the range 10 . ma < 3 · 10eV. Near the lower end of this range, axions are all or a major component of the cold dark matter of the universe. The late infall of axions, and of any other cold dark matter particles, onto our galaxy produces streams and caustics in its...
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Galactic disk formation requires knowledge about the initial conditions under which disk galaxies form, the boundary conditions that affect their secular evolution and the micro-physical processes that drive the multi-phase interstellar medium and regulate their star formation history. Most of these ingredients are still poorly understood. Recent high-resolution observations of young high-redsh...
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We report results of a series of non radiative N-body/SPH simulations in a ΛCDM cosmology, designed to study the growth of angular momentum in galaxy systems. A sample of 41 halos of differing mass and environment were selected from a cosmological N-body simulation of size 32.5h−1Mpc, and re-simulated at higher resolution with the tree-SPH code GADGET. We find that the spin of the baryonic comp...
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We demonstrate a significant difference in the angular momentum transport properties of galactic disks between regions in which the interstellar medium is single phase or two phase. Our study is motivated by observations of H I in extended galactic disks which indicate velocity dispersions of nonthermal origin, suggesting that turbulence in the gas may be contributing significantly to the obser...
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I review the theory of angular momentum acquisition of galaxies by tidal torquing, the resulting angular momentum distribution, the angular momentum correlation function and discuss the implications of angular momentum alignments on weak lensing measurements: Starting from linear models for tidal torquing I summarise perturbative approaches and the results from n-body simulations of cosmic stru...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2013
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.88.123517