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Properties of Knots in Cooling Stellar Jets
Astrophysics and Space Science, 2004Modelling the formation of the maximal emission regions in Herbig-Haro flows, the socalled ‘knots,’ remains a main challenge in the investigation of the YSO’s outflows. Recent HST images of optical regions reveal their wide morphological variety. Knotty structures and arc-like regions coexist, suggesting that several mechanisms could be responsible for
RUBINI, FRANCESCO MARIO +4 more
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Coupled Stellar Jet/Molecular Outflow Models
Astrophysics and Space Science, 1994Molecular outflows can be modelled as environmental material entrained into high velocity stellar jets. Even though models of this entrainment process are at this time quite uncertain, a few preliminary theoretical efforts have been made. Three different models are discussed, in which the molecular outflows are identified with the turbulent mixing ...
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MHD Numerical Simulations of Proto-Stellar Jets
Space Science Reviews, 2003We will summarize in this paper the effects that the presence of the magnetic field can cause to proto-stellar jet dynamics, structure and emission line properties, and the differences between two- and three-dimensional numerical simulations will be emphasized.
Adriano Hoth Cerqueira +1 more
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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
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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.
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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.
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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.
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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.
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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 ...
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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
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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
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