New Frontiers for Diagnosing the Turbulent Nature of the Multiphase Magnetized Interstellar Medium PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download New Frontiers for Diagnosing the Turbulent Nature of the Multiphase Magnetized Interstellar Medium PDF full book. Access full book title New Frontiers for Diagnosing the Turbulent Nature of the Multiphase Magnetized Interstellar Medium by . Download full books in PDF and EPUB format.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 343
Get Book Here
Book Description
Magnetohydrodynamic (MHD) turbulence is a critical component of the current paradigms of star formation, dynamo theory, particle transport, magnetic reconnection and evolution of the interstellar medium (ISM). In order to gain understanding of how MHD turbulence regulates processes in the ISM of galaxies a confluence of numerics, observations, and theory should be used. In this thesis I detail progress that I have made on the connections between theoretical, numerical, and observational understanding of MHD turbulence as it applies to the neutral, ionized, and molecular interstellar medium. In particular, I discuss the development of several new techniques for studies of turbulence to be applied to observations in order to obtain information about the turbulence cascade and the compressibility and magnetization of the fluid. These techniques are first tested on numerical simulations by means of synthetic observations. For most of the numerical tests in this thesis I make use of three-dimensional 512x512x512 compressible MHD isothermal simulations performed for different sonic and Alfvenic Mach numbers. The post processing of these simulations for tests of the turbulence diagnostics include the transformation to column density maps and position-position-velocity (PVV) cubes and can include radiative transfer, telescope beam smoothing, cloud boundaries, and noise. Throughout this thesis I explore the use of new techniques such as the bispectrum, genus statistic, probability distribution function (PDF), hierarchical structure trees (dendrograms), and extend the knowledge of the 2D power spectrum as applied to observations. I discus the application of these techniques to 21-cm data (tracing the warm and cold neutral medium), linear polarization gradients (tracing the warm ionized medium) and emission from carbon monoxide and its isotopes (tracing the molecular medium). This thesis represents a bridge between numerics and observations towards the effort to understand Galactic and extragalactic turbulence and it is just the beginning (i.e. further studies are being conducted that could not be included here). The use of multiple techniques can provide a more accurate indication of the turbulence parameters of interest. The results presented here are based on works I have previously published as first author papers.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 343
Get Book Here
Book Description
Magnetohydrodynamic (MHD) turbulence is a critical component of the current paradigms of star formation, dynamo theory, particle transport, magnetic reconnection and evolution of the interstellar medium (ISM). In order to gain understanding of how MHD turbulence regulates processes in the ISM of galaxies a confluence of numerics, observations, and theory should be used. In this thesis I detail progress that I have made on the connections between theoretical, numerical, and observational understanding of MHD turbulence as it applies to the neutral, ionized, and molecular interstellar medium. In particular, I discuss the development of several new techniques for studies of turbulence to be applied to observations in order to obtain information about the turbulence cascade and the compressibility and magnetization of the fluid. These techniques are first tested on numerical simulations by means of synthetic observations. For most of the numerical tests in this thesis I make use of three-dimensional 512x512x512 compressible MHD isothermal simulations performed for different sonic and Alfvenic Mach numbers. The post processing of these simulations for tests of the turbulence diagnostics include the transformation to column density maps and position-position-velocity (PVV) cubes and can include radiative transfer, telescope beam smoothing, cloud boundaries, and noise. Throughout this thesis I explore the use of new techniques such as the bispectrum, genus statistic, probability distribution function (PDF), hierarchical structure trees (dendrograms), and extend the knowledge of the 2D power spectrum as applied to observations. I discus the application of these techniques to 21-cm data (tracing the warm and cold neutral medium), linear polarization gradients (tracing the warm ionized medium) and emission from carbon monoxide and its isotopes (tracing the molecular medium). This thesis represents a bridge between numerics and observations towards the effort to understand Galactic and extragalactic turbulence and it is just the beginning (i.e. further studies are being conducted that could not be included here). The use of multiple techniques can provide a more accurate indication of the turbulence parameters of interest. The results presented here are based on works I have previously published as first author papers.
Author: Ka Ho Yuen (Ph.D.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Turbulence is ubiquitous in interstellar media and the magnetic field is the most importantforce in the universe, second to gravity. How magnetic field interacts with turbulence is still a mystery to astrophysicists due to the lack of both theoretical understanding and observational measurements. Not until the last decade when we have the modern theory of magneto-hydrodynamic turbulence and the precise interferometric measurements could we disentangle the complex interactions between magnetic fields and the underlying multi-phase interstellar media. My thesis will discuss how do we predict magnetic fields, both directions, and strength, in interstellar media from a theoretical point of view. On top of that, I will also discuss the statistics of magnetized ISM, including how different fundamental MHD modes interact with magnetic fields. More importantly, I shall also cover how magnetic field helps the formation and stability of cold neutral media (HI), including its aspect ratio and some of the observational evidence to my work
Author: Ka Ho Yuen (Ph.D.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Turbulence is ubiquitous in interstellar media and the magnetic field is the most importantforce in the universe, second to gravity. How magnetic field interacts with turbulence is still a mystery to astrophysicists due to the lack of both theoretical understanding and observational measurements. Not until the last decade when we have the modern theory of magneto-hydrodynamic turbulence and the precise interferometric measurements could we disentangle the complex interactions between magnetic fields and the underlying multi-phase interstellar media. My thesis will discuss how do we predict magnetic fields, both directions, and strength, in interstellar media from a theoretical point of view. On top of that, I will also discuss the statistics of magnetized ISM, including how different fundamental MHD modes interact with magnetic fields. More importantly, I shall also cover how magnetic field helps the formation and stability of cold neutral media (HI), including its aspect ratio and some of the observational evidence to my work
Author: José Franco
Publisher: Cambridge University Press
ISBN: 9780521651318
Category : Science
Languages : en
Pages : 304
Get Book Here
Book Description
This timely volume presents a series of review articles covering every aspect of interstellar turbulence--from accretion disks, molecular clouds, atomic and ionized media, through to spiral galaxies - based on a major international conference held in Mexico City.With advances in observational techniques and the development of more efficient computer codes and faster computers, research in this area has made spectacular progress in recent years. This book provides a comprehensive overview of the most important developments in observing and modelling turbulent flows in the cosmos. It provides graduate student and researchers with a state-of-the-art summary of observational, theoretical and computational research in interstellar turbulence.
Author: National Academies of Sciences Engineering and Medicine
Publisher:
ISBN: 9780309677608
Category :
Languages : en
Pages : 291
Get Book Here
Book Description
Plasma Science and Engineering transforms fundamental scientific research into powerful societal applications, from materials processing and healthcare to forecasting space weather. Plasma Science: Enabling Technology, Sustainability, Security and Exploration discusses the importance of plasma research, identifies important grand challenges for the next decade, and makes recommendations on funding and workforce. This publication will help federal agencies, policymakers, and academic leadership understand the importance of plasma research and make informed decisions about plasma science funding, workforce, and research directions.
Author: National Academies of Sciences, Engineering, and Medicine
Publisher:
ISBN: 9780309467346
Category : Science
Languages : en
Pages : 615
Get Book Here
Book Description
The steering committee was specifically asked to (1) provide an overview of the current state of astronomy and astrophysics science, and technology research in support of that science, with connections to other scientific areas where appropriate; (2) identify the most compelling science challenges and frontiers in astronomy and astrophysics, which shall motivate the committee’s strategy for the future; (3) develop a comprehensive research strategy to advance the frontiers of astronomy and astrophysics for the period 2022-2032 that will include identifying, recommending, and ranking the highest-priority research activities; (4) utilize and recommend decision rules, where appropriate, that can accommodate significant but reasonable deviations in the projected budget or changes in urgency precipitated by new discoveries or unanticipated competitive activities; (5) assess the state of the profession, including workforce and demographic issues in the field, identify areas of concern and importance to the community, and where possible, provide specific, actionable, and practical recommendations to the agencies and community to address these areas. This report proposes a broad, integrated plan for space- and ground-based astronomy and astrophysics for the decade 2023-2032. It also lays the foundations for further advances in the following decade.
Author: Mark R. Krumholz
Publisher: World Scientific Publishing Company
ISBN: 9789813142039
Category : Science
Languages : en
Pages : 507
Get Book Here
Book Description
Observing the cold interstellar medium -- Observing young stars -- Chemistry and thermodynamics -- Gas flows and turbulence -- Magnetic fields and magnetized turbulence -- Gravitational instability and collapse -- Stellar feedback -- Giant molecular clouds escales -- The star formation rate at galactic scales: observations -- The star formation rate at galactic scales: theory -- Stellar clustering -- The initial mass function: observations -- The initial mass function: theory -- Protostellar disks and outflows: observations -- Protostellar disks and outflows: theory -- Protostar formation -- Protostellar evolution -- Massive star formation -- The first stars -- Late-stage stars and disks -- The transition to planet formation
Author: H. Alfvèn
Publisher: Springer Science & Business Media
ISBN: 9400983743
Category : Science
Languages : en
Pages : 179
Get Book Here
Book Description
The general background of this monograph and the aim of it is described in detail in Chapter I. As stated in 1.7 it is written according to the principle that "when rigour appears to conflict with simplicity, simplicity is given preference", which means that it is intended for a rather broad public. Not only graduate students but also advanced undergraduates should be able to understand at least most of it. This monograph is the result of many years of inspiring discussions with a number of colleagues, for which I want to thank them very much. Especially I should mention the groups in Stockholm and La Jolla: in Stockholm, Dr Carl-Gunne Flilthammar and many of his collaborators, including Drs Lars Block, Per Carlqvist, Lennart lindberg, Michael Raadu, Staffan Torven, Miroslav Babic, and Itlgvar Axniis, and further, Drs Bo Lehnert and Bjorn Bonnevier, all at the Royal Institute of Technology. Of other col leagues in Sweden, I should mention Dr Bertel Laurent, Stockholm University, Dr Aina Elvius, The Stockholm Observatory, and Dr Bengt Hultqvist, Kiruna. In La Jolla my thanks go first of all to Dr Gustaf Arrhenius, who once invited me to La Jolla, which was the start of a most interesting collaboration; further, to Dr W.B.
Author: A.J. Willis
Publisher: Springer Science & Business Media
ISBN: 9780792341512
Category : Science
Languages : en
Pages : 416
Get Book Here
Book Description
Throughout his career Sir Robert Wilson has demonstrated that advances in a wide variety of fields in astrophysics and laboratory physics are achievable through the application of fundamental plasma spectroscopy. His work has included: optical studies that probed the nature of interstellar dust and first revealed the existence of O star winds; vacuum ultraviolet and X-ray diagnosis of fusion plasmas; rocket ultraviolet and X-ray observations of the Sun; and the conception, development and use of the International Ultraviolet Explorer (IUE) satellite which has contributed greatly to stellar, interstellar and extragalactic astrophysics. This volume contains reviews honouring Sir Robert and reflecting his interests.
Author: Percy Seymour
Publisher: CRC Press
ISBN:
Category : Art
Languages : en
Pages : 168
Get Book Here
Book Description
The study of extraterrestrial magnetic fields is a relatively new one, confirmation of the existance of the first such field (that of our Sun) having come a s late as 1908. In the past 30 years a great ammount of knowledge has been accumulated on Cosmic Magnetism, which has turned out to be a truly fascinating topic for study. Percy Seymour's book is the first to deal with the topic in a non-mathematical way, and he offers a fine introduction to his subject. The first three chapters consolidate our knowledge on magnetism in general and the magnetic field of the Earth, as well as discussing the reasons for studying astronomy and cosmic magnetism in particular. The remainder of the book is devoted to the main areas of cosmic magnetism - solar, plantetary and interplanetary fields, fields in stars and pulsars, fields of the milky way and fields in other galaxies. Cosmic Magnetism in an ideal book for sixth-formers and undergraduates studying physics or astronomy and will also appeal to amateur astronomers. as previous work on this topic has been 'hidden' in specialised academic journals.
