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Author : Weiqun Zhang
Publisher :
ISBN 13 :
Total Pages : 266 pages
Book Rating : 4.:/5 (321 download)
Download or read book Numerical Simulations of Relativistic Jets in Collapsars written by Weiqun Zhang and published by . This book was released on 2003 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Study of Gamma-Ray Burst Jet Formation in Collapsars written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional MHD simulations are performed using the ZEUS-2D code to investigate the dynamics of a collapsar that generates a GRB jet, taking account of realistic equation of state, neutrino cooling and heating processes, magnetic fields, and gravitational force from the central black hole and self-gravity. It is found that neutrino heating processes are not efficient enough to launch a jet in this study. It is also found that a jet is launched mainly by B{sub {phi}} fields that are amplified by the winding-up effect. However, since the ratio of total energy relative to the rest-mass energy in the jet is not as high as several hundred, we conclude that the jets seen in this study are not GRB jets. This result suggests that general relativistic effects will be important to generating a GRB jet. Also, the accretion disk with magnetic fields may still play an important role in launching a GRB jet, although a simulation for much longer physical time ((almost equal to)10-100 s) is required to confirm this effect. It is shown that a considerable amount of 56Ni is synthesized in the accretion disk. Thus, there will be a possibility for the accretion disk to supply the sufficient amount of 56Ni required to explain the luminosity of a hypernova. Also, it is shown that neutron-rich matter due to electron captures with high entropy per baryon is ejected along the polar axis. Thus, there will be a possibility that r-process nucleosynthesis occurs at such a region. Finally, many neutrons will be ejected from the jet, which suggests that signals from the neutron decays may be observed as the delayed bump of the light curve of the afterglow or gamma rays.
Author :
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.:/5 (871 download)
Download or read book Numerical Study on GRB-Jet Formation in Collapsars written by and published by . This book was released on 2006 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional magnetohydrodynamic simulations are performed using the ZEUS-2D code to investigate the dynamics of a collapsar that generates a GRB jet, taking account of realistic equation of state, neutrino cooling and heating processes, magnetic fields, and gravitational force from the central black hole and self gravity. It is found that neutrino heating processes are not so efficient to launch a jet in this study. It is also found that a jet is launched mainly by B{sub {phi}} fields that are amplified by the winding-up effect. However, since the ratio of total energy relative to the rest mass energy in the jet is not so high as several hundred, we conclude that the jets seen in this study are not be a GRB jet. This result suggests that general relativistic effects, which are not included in this study, will be important to generate a GRB jet. Also, the accretion disk with magnetic fields may still play an important role to launch a GRB jet, although a simulation for much longer physical time ≈ 10-100 s is required to confirm this effect. It is shown that considerable amount of 56Ni is synthesized in the accretion disk. Thus there will be a possibility for the accretion disk to supply sufficient amount of 56Ni required to explain the luminosity of a hypernova. Also, it is shown that neutron-rich matter due to electron captures with high entropy per baryon is ejected along the polar axis. Moreover, it is found that the electron fraction becomes larger than 0.5 around the polar axis near the black hole by [nu]{sub e} capture at the region. Thus there will be a possibility that r-process and r/p-process nucleosynthesis occur at these regions. Finally, much neutrons will be ejected from the jet, which suggests that signals from the neutron decays may be observed as the delayed bump of the light curve of the afterglow or gamma-rays.
Author : Miguel A. Aloy
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (593 download)
Download or read book High-resolution 3D Simulations of Relativistic Jets written by Miguel A. Aloy and published by . This book was released on 1999 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Silvano Massaglia
Publisher : Springer
ISBN 13 : 3540769676
Total Pages : 182 pages
Book Rating : 4.5/5 (47 download)
Download or read book Jets From Young Stars III written by Silvano Massaglia and published by Springer. This book was released on 2008-07-18 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of the mechanisms that govern origin and propagation of stellar jets involves the treatment of many concurrent physical processes such as gravitation, hydrodynamics and magnetohydrodynamics, atomic physics and radiation. In the past years, an intensive work has been done looking for so- tions of the ideal MHD equations in the steady state limit as well as studying the stability of out?ows in the linear regime. These kind, of approaches have provided a contribution to the understanding of jets that can hardly be ov- estimated. However, the extension of the analyses to the time-dependent and nonlinear regimes could not be avoided, and the MHD numerical simulations were the only mean to achieve this goal. Intherecentyears,considerableprogresseshavebeenmadebythecom- tational?uiddynamiccommunityinthedevelopmentofnumericaltechniques, theso-calledhighresolutionshockcapturingschemes,wellsuitedforthetre- ment of supersonic ?ows with discontinuities. The numerical simulations of astrophysical jets took advantage of these developments; however new physics needed to be incorporated, such as magnetic ?eld e?ects, radiation losses by diluted gases, and proper astrophysics environments. These needs led to the nontrivial extension of the methods devised for the Euler equations of g- dynamics to the magneto-hydrodynamical system. On the other hand, the possibility of carrying out numerical calculations has been greatly facilitated bytheavailability, ononehand,ofpowerfulsupercomputersand,ontheother hand, of fast processors at low cost. Large scale 3D simulations of jets at high resolution are now possible thanks to supercomputers, but also high reso- tion 2D MHD simulations can be performed routinely on desktop computers.
Author : Eunwoo Choi
Publisher :
ISBN 13 : 9781109982732
Total Pages : 139 pages
Book Rating : 4.9/5 (827 download)
Download or read book Numerical Hydrodynamics of Relativistic Extragalactic Jets written by Eunwoo Choi and published by . This book was released on 2007 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes a multidimensional relativistic hydrodynamic code which solves the special relativistic hydrodynamic equations as a hyperbolic system of conservation laws based on the total variation diminishing (TVD) scheme. Several standard tests and test simulations are presented to demonstrate the accuracy, robustness and flexibility of the code. Using this code we have studied three-dimensional hydrodynamic interactions of relativistic extragalactic jets with two-phase ambient media. The deflection angle of the jet is influenced more by the density contrast of the cloud than by the beam Mach number of the jet, and a relativistic jet with low relativistic beam Mach number can eventually be slightly bent after it crosses the dense cloud. Relativistic jet impacts on dense clouds do not necessarily destroy the clouds completely, and much of the cloud body can survive as a coherent blob due to the combination of the geometric influence of off-axis collisions and the lower rate of cloud fragmentation through the Kelvin-Helmholtz instability for relativistic flows. We find that relativistic jets interacting with clouds can produce synchrotron emission knots similar to structures observed in many VLBI-scale radio sources and the synchrotron emission peaks right before the jet passes through the cloud.
Author : Dieter Kössl
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (643 download)
Download or read book Energy Transport in Sunspot Penumbrae written by Dieter Kössl and published by . This book was released on 1988 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : José M. Martí
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (832 download)
Download or read book Morphology and Dynamics of Relativistic Jets written by José M. Martí and published by . This book was released on 1995 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mark Kendal Bowman
Publisher :
ISBN 13 :
Total Pages : 253 pages
Book Rating : 4.:/5 (643 download)
Download or read book Simulations of Relativistic Extragalactic Jets written by Mark Kendal Bowman and published by . This book was released on 1994 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Carrie M. Swift
Publisher :
ISBN 13 :
Total Pages : 308 pages
Book Rating : 4.3/5 (91 download)
Download or read book Imaging Simulated Relativistic Radio Jets written by Carrie M. Swift and published by . This book was released on 2002 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Numerical Simulations of Astrophysical Jets from Keplerian Accretion Disks [microform] PDF Online Free](https://books.google.com/books/content/images/frontcover/mIZIXwAACAAJ?fife=w200-h370)
Author : Rachid Ouyed
Publisher : National Library of Canada = Bibliothèque nationale du Canada
ISBN 13 : 9780612301658
Total Pages : 271 pages
Book Rating : 4.3/5 (16 download)
Download or read book Numerical Simulations of Astrophysical Jets from Keplerian Accretion Disks [microform] written by Rachid Ouyed and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1997 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dieter Kössl
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (755 download)
Download or read book Numerical simulations of astrophysical jets written by Dieter Kössl and published by . This book was released on 1988 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : William Henry Lee
Publisher : Instituto de Astronomia Universidad Nacional Autonoma de Mex
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.X/5 (3 download)
Download or read book Triggering Relativistic Jets written by William Henry Lee and published by Instituto de Astronomia Universidad Nacional Autonoma de Mex. This book was released on 2007 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents fourteen refereed contributions from some of the participants to the meeting. The accompanying CD-ROM contains an additional twenty non-refereed presentations.
Author : Alexandre Dmitrievich Tchekhovskoi
Publisher :
ISBN 13 :
Total Pages : 293 pages
Book Rating : 4.:/5 (653 download)
Download or read book Simulations and Analytic Models of Relativistic Magnetized Jets written by Alexandre Dmitrievich Tchekhovskoi and published by . This book was released on 2010 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Elena Gallo
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (664 download)
Download or read book Relativistic Jets from Stellar Black Holes written by Elena Gallo and published by . This book was released on 2005 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Oliver Joachim Georg Porth
Publisher :
ISBN 13 :
Total Pages : 209 pages
Book Rating : 4.:/5 (778 download)
Download or read book Formation of Relativistic Jets written by Oliver Joachim Georg Porth and published by . This book was released on 2011 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sridhar Subramanian
Publisher :
ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.:/5 (184 download)
Download or read book A Numerical Analysis of Shocks in Relativistic Quasar Jets written by Sridhar Subramanian and published by . This book was released on 1986 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
