Virtual Astrophysical Jets: Theory Versus Observations

ISBN-13: 9781402000928 / Angielski / Twarda / 2004 / 269 str.

Silvano Massaglia; Gianluigi Bodo; Paola Rossi

Opis

These proceedings are the result of a three-day meeting held in Oogliani (Italy), on October 2-4 2003, whose title was "VIrtual Astrophysical Jets 2003." Our goal in convening this meeting was to gather some of the scientists among the most active in the field of numerical simulations and modelling of astrophysi cal jets. For keeping the participants close to the "real world," we also invited a few observers to give up-to-date reviews outlining the state-of-the-art of jet observations. The principal aim of the meeting was thus to present and critically discuss the state-of-the-art numerical simulations, analytical models and laboratory ex periments for reproducing the main aspects of astrophysical jets and compar ing them with observations. The discussion has been focused on the following topics: Observations and intepretions of jets from young stars and AGNs, comparisons of models with observations; MHO accelerations of jets: steady self-similar models, MHO numerical simula tions of time-dependent accelerations mechanisms; Jet stability and interaction with the ambient: formation of knots in YSO jets, jet survival to instabilities, deceleration of relativistic jets in FRI sources, simulations of jets-IGM interactions, jets propagation and galaxy formation; Numerical codes and their validation: relativistic MHO codes, comparisons among different numerical schemes, jets in the laboratory and code validation. These topics have been discussed intensively during the meeting, and the out come of these discussions is presented in this volume. The contributions have been divided in five sections."

Spis treści

Foreword. Committee and Sponsors. List of Participants. Session 1: Setting the stage: observations and interpretations. G. Giovannini / Observational Properties of Jets in Active Galactic Nuclei. A. Ferrari / AGN Jet Modeling: Setting the Stage. A.C. Raga, T. Beck and A. Riera / Interpreting the Observations of Herbig-Haro Jets. F. Bacciotti / Virtual versus Real Jets: New Clues from the HST. C. Dougados, S. Cabrit, J. Ferreira, N. Pesenti, P. Garcia, D. O'Brien / The Origin of Jets in Young Stars: Steady State Disk Wind Models Confronted to Observations. Session 2: The disk-jet connection: launching and collimation. K. Tsinganos, N. Vlahakis, S.V. Bogovalov, C. Sauty and E. Trussoni / Steady and Time-dependent MHD Modelling of Jets. N. Vlahakis / The Efficiency of the Magnetic Acceleration in Relativistic Jets. C. Sauty, Z. Meliani, E. Trussoni and K. Tsinganos / MHD Outflows from Hot Coronae. J. Ferreira / Virtual Jets: from Self-similar to Numerical Solutions. F. Casse / MHD Accretion-ejection Flows. C. Zanni, A. Ferrari, S. Massaglia, G. Bodo, P. Rossi / On the MHD Acceleration of Astrophysical Jets. S. Komissarov and Y. Lyubarsky / MHD Simulations of Crab's Jet and Torus. Session 3: Jet propagation and stability. P.E. Hardee / The Stability Properties of Astrophysical Jets. H. Baty, R. Keppens and P. Comte / How Can Jets Survive MHD Instabilities? J.M. Martí, M. Perucho and M. Hanasz / Stability of Relativistic Hydrodynamical Planar Jets: Linear and Nonlinear Evolution of Kelvin-Helmholtz Modes. P. Rossi, G. Bodo, S. Massaglia, A. Ferrari and A. Mignone / Entrainment and Deceleration of Relativistic Jets. T. Leismann, M.A. Aloy and E. Müller / MHD Simulations of Relativistic Jets. P. Mimica, M.A. Aloy and E. Müller / Computation of X-ray Blazar Light Curves using RHD simulations. F. Decolle and A.C. Raga / Effects of the Magnetic Field on the Ha Emission from Jets. F. Rubini, C. Giovanardi, S.Lorusso, F. Leewin and F. Bacciotti / Properties of Knots in Cooling Stellar Jets. A. Rogava / Are Astrophysical Shear Flows Able to Heat Themselves? Session 4: Numerical simulations: Codes and their validation. A. Mignone, S. Massaglia and G. Bodo / Astrophysical Jet Simulations: Comparing Different Numerical Methods. L. Del Zanna / Axisymmetric Simulations of Pulsar Wind Nebulae with a New Central-type Scheme for Relativistic MHD. R. Keppens, H. Baty, J. Bergmans and F. Casse / Simulating Magnetized Jets. M. Belan, S. De Ponte, S. Massaglia and D. Tordella / Experiments and Numerical Simulations on the Mid-term Evolution of Hypersonic Jets. Session 5: Jet-ambient interaction. P.J. Wiita / Jet Propagation through Irregular Media and the Impact of Lobes on Galaxy Formation. G. Bodo, C. Zanni, G. Murante, P. Rossi, S. Massaglia and A. Ferrari / Numerical Simulations of the Interaction of Jets with the Intracluster Medium. M. Krause / Large Scale Simulations of the Jets-IGM Interaction. T. Lery, C. Combet and G. Murphy / The Environment of YSO Jets.