نتایج جستجو برای: interstellar matter
تعداد نتایج: 224266 فیلتر نتایج به سال:
It is well known that diffuse gamma-rays are produced by collisions between Galactic cosmic rays and interstellar matter (Hayakawa−Hutchinson−Morrison hypothesis). We estimate the contribution of high energy protons produced by stellar flares to the diffuse component of Galactic gamma-rays. Each star in the Galaxy regularly produces flares that generate high energy protons in the energy range f...
We report on studies of collisions between 3 keV Ar+ projectile ions and neutral targets of isolated 1,3-butadiene (C4H6) molecules and cold, loosely bound clusters of these molecules. We identify molecular growth processes within the molecular clusters that appears to be driven by knockout processes and that could result in the formation of (aromatic) ring structures. These types of reactions ...
The complex suite of organic materials in carbonaceous chondrite meteorites probably originally formed in the interstellar medium and/or the solar protoplanetary disk, but was subsequently modified in the meteorites' asteroidal parent bodies. The mechanisms of formation and modification are still very poorly understood. We carried out a systematic study of variations in the mineralogy, petrolog...
While gravitation sustains the on-going evolution of the cosmos, it is magnetism that breaks gravity’s symmetry and that provides the pathway to the non-thermal Universe. By enabling processes such as anisotropic pressure support, particle acceleration, and jet collimation, magnetism has for billions of years regulated the feedback vital for returning matter to the interstellar and intergalacti...
The model first introduced by Raga & Cantó (1996) in which astrophysical jets are deflected on passing through an isothermal high density region is generalised by taking into account gravitational effects on the motion of the jet as it crosses the high density cloud. The problem is also generalised for relativistic jets in which gravitational effects induced by the cloud are neglected. Two furt...
0009-2614/$ see front matter 2008 Elsevier B.V. A doi:10.1016/j.cplett.2008.07.076 * Corresponding author. Fax: +1 808 956 5908. E-mail address: [email protected] (R.I. Kaiser). Due to the importance of higher carbon oxides of the general formula COx (x > 2) in atmospheric chemistry, isotopic enrichment processes, low-temperature ices in the interstellar medium and in the outer solar system, as ...
Abstract Analysis of interstellar absorption lines observed in high-resolution Hubble Space Telescope spectra nearby stars provides temperatures, turbulent velocities, and kinetic properties warm clouds. A new analysis 97 interstellar-velocity components reveals a wide range temperatures velocities within the Local Interstellar Cloud (LIC) Cluster Clouds (CLIC). These variations appear to be ra...
Context. Carbonaceous chondrites are sources of information on the origin Solar System. Their organic content is conventionally classified as soluble (SOM) and insoluble matter (IOM), where latter represents majority. Aims. In this work, our objectives to identify possible relations between generated in laboratory experiments extrapolate analog findings meteorites test their connection. Methods...
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