Search results for: jets-from-young-stars-iii

Jets From Young Stars III

Author : Silvano Massaglia
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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

Author : International Astronomical Union
File Size : 65.76 MB
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Soviet Astronomy

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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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Protostars Planets II

Author : Tom Gehrels
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The Many Faces of Neutron Stars

Author : R. Buccheri
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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
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Deutsche Nationalbibliografie

Author : Die deutsche Nationalbibliothek
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Protostars and Planets IV

Author : Vincent Mannings
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Click here for the online version of this book! This title, out of print in 2008, is now available free of charge, in it's entirety, online through the University of Arizona Press! Both a textbook and a status report for every facet of research into the formation of stars and planets, Protostars and Planets IV brings together 167 authors who report on the most significant advances in the field since the publication of the previous volume in 1993. Protostars and Planets IV reflects improvements in observational techniques and the availability of new facilities such as the Infrared Space Observatory, the refurbished Hubble Space Telescope, and the 10-m Keck telescopes. Advances in computer technology and modeling methods have benefited theoretical studies of molecular clouds, star formation, and jets and disks, while recent analyses of meteorites yield important insights into conditions and processes within our Sun's early protoplanetary disk. The 49 chapters describe context and progress for observational and theoretical studies of the structure, chemistry, and dynamics of molecular clouds; the collapse of cores and the formation of protostars; the formation and properties of young binary stars; the properties of winds, jets, and molecular outflows from young stellar objects; the evolution of circumstellar envelopes and disks; grain growth in disks and the formation of planets; and the properties of the early Solar nebula. Protostars and Planets IV is also the first book to include chapters describing the discoveries of extrasolar planets, brown dwarfs, and Edgeworth-Kuiper Belt objects, and the first to include high-resolution optical and near-infrared images of protoplanetary disks. Protostars and Planets IV is an unsurpassed reference not only for established researchers but also for younger scientists whose imagination and work will lead to tomorrow's discoveries.

Extragalactic Jets

Author : Travis Arthur Rector
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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)

INIS Atomindex

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Magnetic fields in the universe II

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ICPP 1994

Author : P. H. Sakanaka
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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