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Author: Ke Wang
Publisher:
ISBN: 9783662449707
Category :
Languages : en
Pages : 168
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Book Description
Author: Ke Wang
Publisher:
ISBN: 9783662449707
Category :
Languages : en
Pages : 168
Get Book Here
Book Description
Author: Ke Wang
Publisher: Springer
ISBN: 3662449692
Category : Science
Languages : en
Pages : 160
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Book Description
This thesis presents an in-depth, high-resolution observational study on the very beginning of the formation process: the fragmentation of dense molecular clouds known as infrared dark clouds (IRDCs). Using the Submillimeter Array (SMA) and Very Large Array (VLA) radio interferometers, the author has discovered a common picture of hierarchical fragmentation that challenges some of the leading theoretical models and suggests a new, observation-driven understanding of how massive star formation in clustered environments may begin: it is initiated by the hierarchical fragmentation of a dense filament from 10 pc down to 0.01 pc, and the stellar mass buildup is simultaneously fed by hierarchical accretion at similar scales. The new scenario points out the importance of turbulence and filamentary structure, which are now receiving increasing attention and further tests from both observers and theorists.
Author: Muriel Gargaud
Publisher: Springer Nature
ISBN: 3662650932
Category : Science
Languages : en
Pages : 3376
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Book Description
Now in its third edition the Encyclopedia of Astrobiology serves as the key to a common understanding in the extremely interdisciplinary community of astrobiologists. Each new or experienced researcher and graduate student in adjacent fields of astrobiology will appreciate this reference work in the quest to understand the big picture. The carefully selected group of active researchers contributing to this work are aiming to give a comprehensive international perspective on and to accelerate the interdisciplinary advance of astrobiology. The interdisciplinary field of astrobiology constitutes a joint arena where provocative discoveries are coalescing concerning, e.g. the prevalence of exoplanets, the diversity and hardiness of life, and its chances for emergence. Biologists, astrophysicists, (bio)-chemists, geoscientists and space scientists share this exciting mission of revealing the origin and commonality of life in the Universe. With its overview articles and its definitions the Encyclopedia of Astrobiology not only provides a common language and understanding for the members of the different disciplines but also serves for educating a new generation of young astrobiologists who are no longer separated by the jargon of individual scientific disciplines. This new edition offers ~170 new entries. More than half of the existing entries were updated, expanded or supplemented with figures supporting the understanding of the text. Especially in the fields of astrochemistry and terrestrial extremophiles but also in exoplanets and space sciences in general there is a huge body of new results that have been taken into account in this new edition. Because the entries in the Encyclopedia are in alphabetical order without regard for scientific field, this edition includes a section “Astrobiology by Discipline” which lists the entries by scientific field and subfield. This should be particularly helpful to those enquiring about astrobiology, as it illustrates the broad and detailed nature of the field.
Author: Laura Colzi
Publisher: Firenze University Press
ISBN: 8855183796
Category : Science
Languages : en
Pages : 232
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Book Description
One of the most important tools to investigate the chemical history of our Galaxy and our own Solar System is to measure the isotopic fractionation of chemical elements. In the present study new astronomical observations devoted to the study of hydrogen and nitrogen fractionation (D/H and 14N/15N ratios) of molecules, towards massive star-forming regions in different evolutionary phases, have been presented. Moreover, a new detailed theoretical study of carbon fractionation, 12C/13C ratios, has been done. One of the main results was the confirmation that the 14N/15N ratio increases with the galactocentric distance, as predicted by stellar nucleosynthesis Galactic chemical evolution models. This work gives new important inputs on the understanding of local chemical processes that favor the production of molecules with different isotopes in star-forming regions.
Author: Steven W. Stahler
Publisher: John Wiley & Sons
ISBN: 3527618686
Category : Science
Languages : en
Pages : 865
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Book Description
This book is a comprehensive treatment of star formation, one of the most active fields of modern astronomy. The reader is guided through the subject in a logically compelling manner. Starting from a general description of stars and interstellar clouds, the authors delineate the earliest phases of stellar evolution. They discuss formation activity not only in the Milky Way, but also in other galaxies, both now and in the remote past. Theory and observation are thoroughly integrated, with the aid of numerous figures and images. In summary, this volume is an invaluable resource, both as a text for physics and astronomy graduate students, and as a reference for professional scientists.
Author: International Astronomical Union. Symposium
Publisher: Cambridge University Press
ISBN: 1107192455
Category : Science
Languages : en
Pages : 481
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Book Description
Summarizes state of the art observations and theories pertaining to astrophysical masers and their environments, for graduate students and researchers.
Author: Rafael Bachiller
Publisher: Springer Science & Business Media
ISBN: 1402069359
Category : Science
Languages : en
Pages : 338
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Book Description
Currently under construction in Northern Chile, the Atacama Large Millimeter Array (ALMA) is the most ambitious astronomy facility under construction. This book describes the enormous capabilities of ALMA, the state of the project, and most notably the scientific prospects of such a unique facility. The book includes reviews and recent results on most hot topics of modern astronomy. It looks forward to the revolutionary results that are likely to be obtained with ALMA.
Author: Derek Ward-Thompson
Publisher: Frontiers Media SA
ISBN: 2889637727
Category :
Languages : en
Pages : 224
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Book Description
Author: Charles J. Lada
Publisher: Springer Science & Business Media
ISBN: 9780792359081
Category : Science
Languages : en
Pages : 756
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Book Description
Proceedings of the NATO Advanced Study Institute, The Physics of Star Formation and Early Evolution-II, held in Crete, Greece, 24 May-5 June, 1998
Author: Steven Stahler
Publisher: Springer
ISBN: 3319228013
Category : Science
Languages : en
Pages : 205
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Book Description
All stars are born in groups. The origin of these groups has long been a key question in astronomy, one that interests researchers in star formation, the interstellar medium, and cosmology. This volume summarizes current progress in the field, and includes contributions from both theorists and observers. Star clusters appear with a wide range of properties, and are born in a variety of physical conditions. Yet the key question remains: How do diffuse clouds of gas condense into the collections of luminous objects we call stars? This book will benefit graduate students, newcomers to the field, and also experienced scientists seeking a convenient reference.
