Late accretion models for formation of the Galactic halo require that many Galactic satellite galaxies have been cannibalised into the halo field. Comparison of the metallicity and age distribution function of stars in the surviving satellites with the apparently exclusively old stars in the field halo can constrain the importance of any such process. We have developed a new objective technique...

Halo neurofi broma is a rare benign tumor. In the past, 3 cases of multiple halo neurofi bromas and 1 case of a solitary halo neurofi broma have been reported. The neurofi broma is characterized by a skin-colored, dome-shaped soft papule or a nodule surrounded by hypopigmented macules. The pathogenesis of neuroectodermally derived tumors associated with halo phenomenon is still poorly understoo...

A generation of halo particles and an emittance growth are investigated numerically for a highcurrent beam transport during a longitudinal bunch compression. The halo particles are generated during the drift compression with an alternating gradient confinement lattice in the transverse direction. The emittance growth is caused by the halo particle generation, and depends on the drift length for...

It is well-established that the vast majority of metal-poor Galactic halo stars shows evidence for enrichment by solely massive stars. Recent observations have identified more varied behavior in the pattern of elemental abundances measured for metal-rich, [Fe/H]∼ −1 dex, halo stars, with both high and low values of the ratio of [α/Fe]. The low values are most naturally due to the incorporation ...

We construct self-consistent dynamical models for disk galaxies with triaxial, cuspy halos. We begin with an equilibrium, axisymmetric, disk-bulge-halo system and apply an artificial acceleration to the halo particles. By design, this acceleration conserves energy and thereby preserving the system’s differential energy distribution even as its phase space distribution function is altered. The h...

We have developed a new method to extract halo merger rates from the Millennium Simulation. First, by removing superfluous mergers that are artifacts of the standard Friends-Of-Friends (FOF) halo identification algorithm, we find a lower merger rate compared to previous work. The reductions are more significant at lower redshifts and lower halo masses, and especially for minor mergers. Our new ...

We review the present understanding of beam halo in proton linacs. Space-charge forces acting in mismatched beams have been identified as a major cause of beamhalo. We introduce a new description of the halo using the ratio of moments of the distribution of beam coordinates. We describe the beam-halo experiment that is in preparation at Los Alamos, which will address questions about the beam pr...

I review the properties of the Galaxy’s stellar halo, specifically as traced by horizontal branch stars, but with reference to and in comparison with other stellar tracers. I discuss the halo density profile, the variation in horizontal branch morphology with Galactic position, and the kinematics of halo stars in several regions of the Galaxy. I summarize the horizontal branch star findings and...

The “holy grail” of (object) learning has been to facilitate just-in-time learning of skills that is delivered in a manner that works best for the learner. That is, the right skills at the right time in the right way. To facilitate this “holy grail”, developers of learning would be able to develop content that could be customized, reused and transformed for delivery in different formats easily,...

We review the various techniques used to constrain the Galactic halo mass profile for radii ∼> 20 kpc with particular emphasis on identifying a self-consistent halo model and resolving the apparent discrepancies present in the literature on this subject. We collate published results and demonstrate that they are all consistent with a Galactic halo that is nearly isothermal with a characteristic...