Jets From Young Stars Iii

Author: Silvano Massaglia
Editor: Springer Science & Business Media
ISBN: 3540769668
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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.

Physics Briefs

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The Irish Astronomical Journal

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Revista Mexicana De Astronom A Y Astrof Sica

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Information Bulletin

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Soviet Astronomy

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Protostars Planets Ii

Author: Tom Gehrels
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International Aerospace Abstracts

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Astronomy And Astrophysics

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The Astronomical Journal

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Deutsche Nationalbibliografie

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The Many Faces Of Neutron Stars

Author: R. Buccheri
Editor: Springer
ISBN:
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A survey of recent progress in research on neutron stars, emphasising radio pulsars, accreting neutron stars in X-ray binaries, and the rotation-powered high-energy emission from isolated neutron stars. Among the subjects reviewed are: the broad history of neutron star research; the properties of high-density matter in neutron stars; thermal and magnetic field evolution; dynamics of neutron star crusts and glitches; detection of radio emission from pulsars; radio pulsar population; millisecond and binary radio pulsars; gamma-ray emission from radio pulsars; accreting neutron stars (and black holes) in X-ray binaries; the recently discovered kHz oscillations in low-mass X-ray binaries; anomalous X-ray pulsars; the Bursting Pulsar; X-ray emission from isolated neutron stars; neutron star atmosphere; coalescing neutron star binaries; and gamma ray bursts.

Memorie Della Societ Astronomica Italiana

Author: Società astronomica italiana
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Birth And Infancy Of Stars

Author: D.. Chance
Editor: North Holland
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Extragalactic Jets

Author: Travis Arthur Rector
Editor: Astronomical Society of the pacific
ISBN:
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"These proceedings of an international meeting held May 2007 in Girdwood, Alaska, USA provide a comprehensive overview of recent theoretical and observational work on the nature of extragalactic jets, from parsec to kiloparsec scales. Special emphasis is given to the interaction of jets with their environment and to the insights this interaction can provide. The invited reviews, contributed talks, and poster sessions form a detailed summary of the latest findings, as well as illustrate outstanding questions that remain to be resolved. This book is suitable for researchers and graduate students. The origin and evolution of highly collimated and highly energetic outflows from the nuclei of some galaxies remains, after over 30 years of intensive study, and enigmatic process. We still do not know how these jets are collimated, or what they contain beyond relativistic particles and magnetic fields, much less how they come to be in the first place. If we could unravel the mystery of their origins, then it is clear that new and significant constraints could also be placed on the origin and evolution of the "central engine," presumably a massive black hole, that creates them. This is turn would give rise to new constraints on the formation and evolution of the parent galaxies and their environment. The quest for insights into the nature of these objects has always been made difficult by the last of information conveyed by their simple power law radiation spectrum, and so much of the information gained must be inferential. However, the hope remains that by gaining an understanding of the interaction of these objects with their environment we may be able to deduce the key parameters of the jets themselves. This strategy of working from "the outside in" is showing increasing promise as higher resolution observations with increasing sensitivity are being made over increased coverage in wavelength, especially as these are cast against results from sophisticated theoretical calculations that include three-dimensional MHD simulations."--Publisher's website.

Ngst Science And Technology Exposition

Author: Eric Philip Smith
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Annotation Representatives of the astronomical and technical communities trade views on the state of the Next Generation Space Telescope just after instrument studies in the US, Europe, and Canada were completed and being presented in public for the first time, and Phase A prime contractors had been selected and were beginning their detailed design studies. In 66 reports they consider problems facing the design, construction, and use of the instrument and the benefits and drawbacks of various solutions to them, focusing mostly on infrared astronomy in the near and middle ranges. Annotation c. Book News, Inc., Portland, OR (booknews.com)

Magnetic Fields In The Universe Ii

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Inis Atomindex

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Jets In Young Stellar Objects

Author: Amadeu J. L. Fernandes
Editor: Springer Science & Business Media
ISBN: 9781402016172
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The ubiquity of jet phenomena in young stellar objects, active galactic nuclei, symbiotic stars, planetary nebulae and x-ray binaries has driven a broad literature on the astrophysics of collimated mass ejection. One of the fundamental open problems in star formation is the understanding of the physical mechanisms by which mass is ejected from the protostellar system and collimated into jets. Locally, jets will regulate the system's angular momentum and therefore its evolution during the first few million years. At large scale, jets inject momentum into the cloud thus affecting its star formation efficiency and evolution.Many recent advances over the last years in the star-formation research (both theory and observations) together with the increasing availability of computational resources, provided an excellent opportunity to organise a workshop. This volume presents the results of the workshop discussions on the jet phenomenon on different astrophysical scales and covers interdisciplinary areassuch as steady state winds, time-dependent winds/jets, jet energetics and jet/wind propagation.

Icpp 1994

Author: P. H. Sakanaka
Editor: Amer Inst of Physics
ISBN:
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Invited papers delivered at ICPP 1994, which is the joint conference of the 10th Kiev International Conference on Plasma Theory and the 10th International Congress on Waves and Instabilities in Plasmas. In addition to summary talks and an opening colloquium on solar eclipses, subjects addressed incl