Results 161 to 170 of about 35,438 (198)
Some of the next articles are maybe not open access.
Leptonic jets from young stellar objects?
Astrophysics and Space Science, 1988Various explanations of the bipolar-flow phenomenon in star-forming regions are compared and confronted with the observed facts. It is concluded that stellar-wind interpretations are inconsistent with the constraints. The ‘exotic’ property of young stellar objects may be their extreme spin which implies strong magnetic fields and vacuum discharges ...
Blome, Hans-Joachim (Prof. Dr. rer. nat.) +1 more
openaire +1 more source
2017
Young stars are usually associated with two types of high velocity phenomena: stellar jets and bipolar outflows. Jets (and their accompanying counter-jets) are highly collimated, have very high velocities in the range 100–1000 km s−1 and may extend out of the star-forming cores for distances as great as 10 pc.
openaire +1 more source
Young stars are usually associated with two types of high velocity phenomena: stellar jets and bipolar outflows. Jets (and their accompanying counter-jets) are highly collimated, have very high velocities in the range 100–1000 km s−1 and may extend out of the star-forming cores for distances as great as 10 pc.
openaire +1 more source
Relativistic Jets in Stellar Systems
2014Albeit their nature remains elusive, relativistic, collimated outflows of energy and particles appear to be a nearly ubiquitous feature of accreting black holes. As evidence accumulates for a dominant role of the jet in dissipating the liberated accretion power, questions around their powering mechanism and even composition remain unanswered.
openaire +1 more source
Stellar and galactic jets: theoretical issues
Canadian Journal of Physics, 1986Theoretical issues pertaining to the modelling of jets in young stellar objects and in active galactic nuclei are reviewed. The strong morphological similarities between these two types of sources are emphasized, and observational constraints on the basic physical mechanisms that may be responsible for the jet phenomenon are outlined.
openaire +1 more source
Stellar and Extragalactic Jets: An Introduction
1987In recent years collimated outflows of gas, commonly called jets, have been discovered in various astrophysical objects. The most prominent ones are those in extragalactic radio sources including objects such as powerful and weak radio galaxies, quasars and Seyfert galaxies (see,e.g., the reviews by BRIDLE and PERLEY [1] and PERLEY [2]), but also jet ...
openaire +1 more source
Stellar jets: Spectral diagnostics and fluidodynamic models
1996We present a non-standard, straightforward procedure for a model-independent determination of crucial physical parameters of the linear section of stellar jets, such as the hydrogen ionization fraction x and the temperature T e of the emitting gas. The method can be easily applied to every Herbig-Haro jet for which the brightest red lines have been ...
F. Bacciotti +4 more
openaire +1 more source
Application of Tomographic Techniques to Stellar Jets
2009We show how standard tomographic techniques may be applied to study the three dimensional structure of stellar jets. To achieve this, we invert observed emission maps, and determine the physical parameters from the line ratios. For the first time this technique is applied to the HH30 jet, showing that the jet is denser and more fragmented than what can
Fabio De Colle +2 more
openaire +1 more source
Spiral stellar nebulae and cosmic gas jets
Journal of the Franklin Institute, 1961Abstract The paper describes the successful culmination of a search for photographic evidence of the existence of spiral stellar nebulae, initiated by the writer's electrical discharge theory of astrophysical atmospheric phenomena, as applied to some types of bright line stars.
openaire +1 more source
Pinch Instabilities in Young Stellar Object Jets
1988It is proposed that the quasi-periodic knot-like features seen in jets from young stars may, in some cases, be due to Kelvin-Helmholtz instabilities; in particular, non-disruptive reflection modes. Numerical simulations have shown that such modes saturate at finite amplitude through the formation of a periodic train of oblique internal shock waves ...
T. P. Ray, T. Bührke, R. Mundt
openaire +1 more source
X-Ray Emission from Young Stellar Jets
2009Jets from protostars and T Tauri stars define a separate and new class of X-ray sources. New evidence suggests that X-ray emission originates in microjets of several classical T Tauri stars. We summarize the present status of our search for jet-related X-ray emission and discuss physical implications for the jet gas.
Manuel Güdel +6 more
openaire +1 more source