Cosmic Rays In Star Forming Environments
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Cosmic Rays In Star Forming Environments
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Author : Diego F. Torres
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-19
Cosmic Rays In Star Forming Environments written by Diego F. Torres and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-19 with Science categories.
These are the proceedings of the Sant Cugat Forum 2nd Workshop on Cosmic-ray Induced Phenomenology in Stellar Environments, held April 16-19, 2012. The aim of this Workshop was to address the current knowledge and challenges of high-energy emission from stellar environments at all scales and provide a comprehensive review of the state of the field from the observational to the theoretical perspectives. In the meeting, the prospects for possible observations with planned instruments across the multi-wavelength spectrum were analyzed and also how they impact on our understanding of these systems.
Star Formation
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Author : Andrei M. Bykov
language : en
Publisher: Springer
Release Date : 2021-10-14
Star Formation written by Andrei M. Bykov and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-10-14 with Science categories.
The review papers in this volume provide an in-depth examination of complex astrophysical phenomena of star formation via multi-wavelength observations and modeling. Among the fundamental issues discussed in the book are: The role of gravity and magnetized turbulence in the formation and evolution of molecular clouds The stellar feedback (supernovae, HII regions, winds, cosmic rays) in regulating star formation The origin of the stellar initial mass function and its universality across various environments Jets, magnetic fields and high energy particles in stellar clusters The origin of the first stars and black holes The goal of these papers is to review the major processes governing star formation and to investigate how they are interlinked. In doing so, they provide an in-depth look at the tremendous theoretical and observational progress that has been made in the recent past and also outline future perspectives. Previously published in Space Science Reviews in the Topical Collection "Star Formation”
Acceleration And Propagation Of Cosmic Rays In High Metallicity Astrophysical Environments
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Author : Ana Laura Müller
language : en
Publisher: Springer Nature
Release Date : 2022-10-01
Acceleration And Propagation Of Cosmic Rays In High Metallicity Astrophysical Environments written by Ana Laura Müller and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-01 with Science categories.
This thesis addresses the feasibility of the production of ultra-high-energy cosmic rays in starburst galaxies and active galactic nuclei. These astrophysical objects were theoretically proposed as candidate sources a long time ago. Nevertheless, the interest in them has been recently renewed due to the observational data collected by the Pierre Auger Observatory and the Telescope Array. In this work, a comprehensive review of the current status of the research on cosmic rays accelerators is provided, along with a summary of the principal concepts needed to connect these relativistic particles with electromagnetic and neutrino observations in the multi-messenger era. On one hand, the hypothesis of accelerating particles with energies above 1018 eV in starburst superwinds is carefully revisited, taking into account the constraints imposed by the most recent electromagnetic observations. On the other hand, an alternative new model for the gamma emission of the nearby active galaxy NGC 1068 is presented. The implications of the results of these studies are discussed in terms of the contemporary observatories and prospects for future experiments are offered.
Cosmic Ray Interaction In Molecular Environment
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Author : Vo Hong Minh Phan
language : en
Publisher:
Release Date : 2020
Cosmic Ray Interaction In Molecular Environment written by Vo Hong Minh Phan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
It has been revealed by observational evidences from various experiments at the beginning of the 20th century that the Earth is constantly bombarded by cosmic rays, high-energy particles of extraterrestrial origin. Since these particles are very energetic, it is believed that they could penetrate deep into molecular clouds and ionize the densest parts of these objects where new stars are born. This means that cosmic rays regulate the level of ionization that controls not only the chemistry of molecular clouds but also the coupling between the gas and the magnetic field which support the cloud against gravity during the process of star formation. Interestingly, the ionization rates inferred from infrared and radio observations are much larger than the commonly quoted value in the literature. This calls for a reassessment from a theoretical point of view of the ionization rate in clouds. This task requires a better understanding of the transport of cosmic rays into clouds and, more importantly, the knowledge of the amount of low energy cosmic rays at different positions in our Galaxy. The former has been investigated in some of the pioneering papers in the seventies and eighties but there might be room for some improvements. The latter is known not too long ago at least for the local interstellar medium thanks to the data from the Voyager probes. It is, however, not very clear whether or not these data could be considered as reference values for the density of low energy cosmic rays in the entire Galaxy. The aim of this work is, therefore, to study the propagation of low energy cosmic rays in neutral environments and also to better interpret the observational data of the ionization rate in both isolated molecular clouds and the ones in the vicinity of cosmic accelerators like supernova remnants.
Diffuse Matter From Star Forming Regions To Active Galaxies
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Author : T.W. Hartquist
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-05-02
Diffuse Matter From Star Forming Regions To Active Galaxies written by T.W. Hartquist and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-02 with Science categories.
John Dyson has contributed to the study of the hydrodynamic processes that govern a wide variety of astrophysical sources which he has helped explain. In this volume dedicated to him, introductory reviews to a number of the key processes and to the sources themselves are given by leading experts. The book provides a coherent introduction to the astrophysics of diffuse sources suitable for postgraduate students and researchers in astrophysics.
Hadronic Processes Of Energetic Particles In Star Forming Galaxies And High Redshift Protogalactic Environments
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Author : Ellis Richard Owen
language : en
Publisher:
Release Date : 2019
Hadronic Processes Of Energetic Particles In Star Forming Galaxies And High Redshift Protogalactic Environments written by Ellis Richard Owen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Diffuse Matter From Star Forming Regions To Active Galaxies
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Author : T.W. Hartquist
language : en
Publisher: Springer
Release Date : 2009-09-03
Diffuse Matter From Star Forming Regions To Active Galaxies written by T.W. Hartquist and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-09-03 with Science categories.
John Dyson has contributed to the study of the hydrodynamic processes that govern a wide variety of astrophysical sources which he has helped explain. In this volume dedicated to him, introductory reviews to a number of the key processes and to the sources themselves are given by leading experts. The book provides a coherent introduction to the astrophysics of diffuse sources suitable for postgraduate students and researchers in astrophysics.
Star Formation In High Pressure High Energy Density Environments
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Author :
language : en
Publisher:
Release Date : 2005
Star Formation In High Pressure High Energy Density Environments written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Dust grains control the chemistry and cooling, and thus the gravitational collapse of interstellar clouds. Energetic particles, shocks and ionizing radiation can have a profound influence on the structure, lifetime and chemical reactivity of the dust, and therefore on the star formation efficiency. This would be especially important in forming galaxies, which exhibit powerful starburst (supernovae) and AGN (active galactic nucleus) activity. How dust properties are affected in such environments may be crucial for a proper understanding of galaxy formation and evolution. The authors present the results of experiments at LLNL which show that irradiation of the interstellar medium (ISM) dust analog forsterite (Mg2SiO4) with swift heavy ions (10 MeV Xe) and a large electronic energy deposition amorphizes its crystalline structure, without changing its chemical composition. From the data they predict that silicate grains in the ISM, even in dense and cold giant molecular clouds, can be amorphized by heavy cosmic rays (CR's). This might provide an explanation for the observed absence of crystalline dust in the ISM clouds of the Milky Way galaxy. This processing of dust by CR's would be even more important in forming galaxies and galaxies with active black holes.
Astrophysics With Radioactive Isotopes
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Author : Roland Diehl
language : en
Publisher: Springer
Release Date : 2018-10-11
Astrophysics With Radioactive Isotopes written by Roland Diehl and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-11 with Science categories.
Dealing with astrophysics derived from the radiation emitted by radioactive atomic nuclei, this book describes the different methods used to measure cosmic radio-isotopes. It demonstrates how this astronomical window has contributed to the understanding of the sources and the chemical evolution of cosmic gas. Reference materials and explanations are included for students in advanced stages of their education. Nuclear reactions in different sites across the universe lead to the production of stable and unstable nuclei. Their abundances can be measured through different methods, allowing to study the various nuclear processes taking place in cosmic environments. Nucleosynthesis is the cosmic formation of new nuclear species, starting from hydrogen and helium resulting from the big bang origins. Stars create and eject synthesized nuclei during their evolution and explosions. Incorporation of the new interstellar composition into next-generation stars characterises the compositional (chemical) evolution of cosmic gas in and between galaxies. Radioactive species have unique messages about how this occurs. Since the first Edition of this book published in 2011 with the title Astronomy with Radioactivities, long-awaited new direct observations of supernova radioactivity have been made and are now addressed in two updated chapters dealing with supernovae. In this second Edition, the advances of recent years beyond one-dimensional treatments of stellar structure and stellar explosions towards 3-dimensional models have been included, and led to significant re-writings in Chapters 3-5. The sections on the Solar System origins have been re-written to account for new insights into the evolution of giant molecular clouds. The chapter on diffuse radioactivities now also includes material measurements of radioactivities in the current solar system, and their interpretations for recent nucleosynthesis activity in our Galaxy. Significant new results on gamma-rays from positron annihilations have been accounted for in that chapter, and led to new links with nucleosynthesis sources as well as interstellar transport processes. A new chapter now provides a description of interstellar processes often called 'chemical evolution', thus linking the creation of new nuclei to their abundance observations in gas and stars. The experimental / instrumental chapters on nuclear reaction measurements, on gamma-ray telescopes, and pre-solar grain laboratories have been updated. Moreover, new windows of astronomy that have been opened up in recent years have been included in the discussions of the multi-messenger approach that broadens the basis for astrophysical insights.
Science With The Cherenkov Telescope Array
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Author : The Cta Consortium
language : en
Publisher: World Scientific
Release Date : 2018-12-31
Science With The Cherenkov Telescope Array written by The Cta Consortium and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-12-31 with Science categories.
This book summarizes the science to be carried out by the upcoming Cherenkov Telescope Array, a major ground-based gamma-ray observatory that will be constructed over the next six to eight years. The major scientific themes, as well as core program of key science projects, have been developed by the CTA Consortium, a collaboration of scientists from many institutions worldwide.CTA will be the major facility in high-energy and very high-energy photon astronomy over the next decade and beyond. CTA will have capabilities well beyond past and present observatories. Thus, CTA's science program is expected to be rich and broad and will complement other major multiwavelength and multimessenger facilities. This book is intended to be the primary resource for the science case for CTA and it thus will be of great interest to the broader physics and astronomy communities. The electronic version (e-book) is available in open access.