CERTAIN UNUSUAL HALOS

Fossil alpha-recoil analysis of certain variant radioactive halos.

The distribution of alpha-radioactivity in the vicinity of uranium and of certain variant radioactive halos in biotite was investigated by the fossil alpharecoil method. Within the limits of the method I could not confirm a previously proposed hydrothermal mechanism for the origin of certain variant halo types due to polonium isotopes.

Mathematical Modeling in Unusual Contexts: Rainbows, Halos and Glories

Halos and ice crystals

Observing cirrus halos to constrain in-situ measurements of ice crystal size T. J. Garrett, M. B. Kimball, G. G. Mace, and D. G. Baumgardner Department of Meteorology, University of Utah, Salt Lake City, UT, 84112-0110, USA Universidad Nacional Autonoma de Mexico, Mexico City, Mexico Received: 21 December 2006 – Accepted: 16 January 2007 – Published: 26 January 2007 Correspondence to: T. Garret...

Dwarf Dark Matter Halos

We use N-body simulations to study properties of dwarf halos with virial masses in the range 10 − 10hM⊙. Unlike recent reported results, we find that the density profiles of relaxed dwarf halos are well fitted by the NFW profile and do not have cores. We estimate the distribution of concentrations for halos in mass range that covers six orders of magnitude from 10 hM⊙ to 10 13 hM⊙, and find tha...

Cusps in CDM halos

We resolve the inner region of a massive cluster forming in a cosmological ΛCDM simulation with a mass resolution of 2 × 106M⊙ and before z=4.4 even 3 × 10 5M⊙. This is a billion times less than the clusters final virial mass and a substantial increase over current ΛCDM simulations. We achieve this resolution using a new multi-mass refinement procedure and are now able to probe a dark matter ha...