Chandra observations of the core of the nearby starburst galaxy NGC 253 reveal a heavily absorbed source of hard X-rays embedded within the nuclear starburst region. The source has an unabsorbed, 2 to 10 keV luminosity of ≥ 10 erg s and photoionizes the surrounding gas. We observe this source through a dusty torus with a neutral absorbing column density of NH ∼ 2 × 10 23 cm. The torus is hundre...

Black holes do not Hawking radiate strictly blackbody radiation due to well-known frequency-dependent greybody factors. These factors arise from frequency-dependent potential barriers outside the horizon which filter the initially blackbody spectrum emanating from the horizon. D-brane bound states, in a thermally excited state corresponding to near-extremal black holes, also do not emit blackbo...

UNLABELLED Organic-inorganic hybrid perovskite materials offer the potential for realization of low-cost and flexible next-generation solar cells fabricated by low-temperature solution processing. Although efficiencies of perovskite solar cells have dramatically improved up to 19% within the past 5 years, there is still considerable room for further improvement in device efficiency and stabilit...

Considering electrically charged test particles, we continue our study of the exterior dynamics a Weyl black hole which has been previously investigated regarding motion mass-less and (neutral) massive particles. In this paper, deflecting trajectories particles are designated as being gravitationally Rutherford-scattered detailed discussions angular radial particle motions presented.

Detachment of neutral cations/anions from solid alkali halides can in principle be provoked by donating/subtracting electrons to the surface of alkali halide crystals, but generally constitutes a very endothermic process. However, the amount of energy required for emission is smaller for atoms located in less favorable positions, such as surface steps and kinks. For a corner ion in an alkali ha...

Charge transfer between hyperthermal alkali atoms and metallic scattering surfaces is an experimental and theoretical arena for many-body interactions. To model new facets, we use a generalized time-dependent Newns-Anderson Hamiltonian that includes electron spin, multiple atomic orbitals with image shifted levels, intra-atomic Coulomb repulsion, and resonant exchange. A variational electronic ...

We have studied spacetime structures of static solutions in the n-dimensional Einstein-GaussBonnet-Maxwell-Λ system. Especially we focus on effects of the Maxwell charge. We assume that the Gauss-Bonnet coefficient α is non-negative and 4α̃/l ≤ 1 in order to define the relevant vacuum state. Solutions have the (n− 2)-dimensional Euclidean sub-manifold whose curvature is k = 1, 0, or −1. In Gauss...

using piezoelectric patches the stress concentration around a hole on a plate under tension is reduced and controlled. to attain the reduction in stress two placements for piezoelectric patches is investigated. the first location is top/bottom of the hole with compression induced strain and the second is left/right of the hole with tension induced strains to control the stress flow. the result ...

We examine the thermodynamic behavior of a static neutral regular (non-singular) black hole enclosed in finite isothermal cavity. The cavity enclosure helps us investigate systems canonical or grand ensemble. Here we demonstrate derivation reduced action for general metric by considering new expression contains quantum corrections at short distances and concludes to singular large distances. ap...

We study the dynamics of test particles around a magnetized Ernst black hole considering its magnetic field in environment surrounding hole. show how can influence and epicyclic motion Based on analysis, we find that radius innermost stable circular orbit (ISCO) for both neutral charged frequencies are strongly affected by field. also ISCO decreases rapidly. It turns out gravitational Lorentz f...