The Wisconsin H-Alpha Mapper (WHAM) Northern Sky Survey is revealing that many intermediate-velocity (|v LSR | ≤ 100 km s −1) neutral clouds and complexes have an associated ionized component. We present the first map of the Hα emission from an intermediate-or high-velocity structure: Complex K. This large, high-latitude feature stretches from ℓ ≈ 10 • to 70 • , b ≈ +30 • to +70 • and peaks in ...

The structure of steady plane-parallel radiative shock waves propagating through the hydrogen gas undergoing partial ionization and excitation of bound atomic states is investigated in terms of the self-consistent solution of the equations of fluid dynamics, radiation transfer and atomic kinetics. The shock wave model is represented by a flat finite slab with no incoming radiation from external...

At low densities, when radiation of an accreting gas is dynamically unimportant, quasi-spherical non-radiative accretion flow is formed around a compact object. We show that the density of the flow is n ∝ r −1/2. The gas compression is much weaker than the standard Bondi's, n ∝ r −3/2 , because most of the gas does not reach the compact object. It can either circulate indefinitely long or it ca...

Blazar emission of gamma rays and cosmic ray production of gamma rays in gas-rich clusters have been proposed recently as alternative sources of the high energy extragalactic diffuse gamma ray background radiation. We show that these sources also produce a very different high energy extragalactic diffuse neutrino background radiation. This neutrino background may be detected by the new generati...

5 Abstract Data obtained from the exploration of the outer solar system has led to a 6 new area of physics: electronically induced sputtering of low-temperature, 7 condensed-gas solids, here referred to as ices. Icy bodies in the outer solar system 8 are bombarded by relatively intense fluxes of ions and electrons, as well as the 9 background solar UV flux, causing changes in their optical refl...

We present the first ever hydrodynamic calculations of star cluster formation that incorporate the effect of feedback from ionising radiation. In our simulations, the ionising source forms in the cluster core at the intersection of several dense filaments of inflowing gas. We show that these filaments collimate ionised outflows and suggest such an environmental origin for at least some observed...

The cold bore experiment (COLDEX), that can be cooled below 3 K, has been fitted with a ~ 2 m long actively cooled beam screen equipped with cryosorber to simulate the LHC Long Straight Section (LSS) beam screens. Effects of both synchrotron radiation at grazing incidence with 194 eV critical energy and gas injections have been studied. Results as a function of temperature, gas species and gas ...

Groups and clusters contain a large fraction of hot gas which emits X-ray radiation. This gas yields information on the dynamical state and on the total mass of these systems. X-ray spectra show that heavy elements are present in the gas. As these metals must have been produced in the cluster/group galaxies and later transported into the gas, the metallicity is a good tracer for the transport p...

Soybean, Glycine max (L.) Merr. cv Essex, plants were grown in the field in a 2 x 2 factorial design, under ambient and supplemental levels of ultraviolet-B (UV-B) radiation (supplemental daily dose of 5.1 effective kilojoules per square meter) and were either well-watered or subjected to drought. Soil water potentials were reduced to -2.0 megapascals by the exclusion of natural precipitation i...

Two different model-independent mapping techniques have been applied to CGRO OSSE, SMM, TGRS and balloon data and reveal a feature in the 0.511 MeV e +-e − annihilation radiation pattern of our galaxy centered at ℓ ∼ −2 • and b ∼ 10 • with a flux of ∼ 5 · 10 −4 0.511 MeV ph cm −2 s −1. If near the galactic center, then e + sources are producing ∼ 10 42 e + s −1 which annihilate ≈ 1-2 kpc above ...