Understanding The Structure Of Molecular Clouds

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Understanding the Structure of Molecular Clouds

Author : Jan Orkisz
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (18 download)

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Book Synopsis Understanding the Structure of Molecular Clouds by : Jan Orkisz

Download or read book Understanding the Structure of Molecular Clouds written by Jan Orkisz and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The new generation of wide-bandwidth high-resolution receivers turns almost any radio observation into a spectral survey. In the case of wide-field imaging of the interstellar medium, such a wealth of data provides new diagnostic tools, but also poses new challenges in terms of data processing and analysis. The ORION-B project aims at observing 5 square degrees of the OB molecular cloud, or about half of the cloud's surface, over the entire 3mm band. The emission of tens of molecular tracers has been mapped, including CO isotopologues, HCO, HCN, HNC, N2H+, methanol, SO, CN...Having access to spatially resolved maps from many molecular species enables us to identify the best tracers of the gas density and illumination. Machine learning techniques have also been applied to these maps, in order to segment the molecular cloud into typical regions based on their molecular emission, and to quantify the most meaningful correlations of different molecular tracers with each other and with physical quantities such as density or dust temperature.The wide-field coverage, together with the spatial and spectral resolution, also allows to characterize statistically the kinematics and dynamics of the gas. The amount of momentum in the compressive and solenoidal (rotational) modes of turbulence are retrieved, showing that the cloud is dominated by solenoidal motions, with the compressive modes being concentrated in two star-forming regions. This result is in line with the overall very low star formation efficiency of the cloud, and highlights the role of compressive forcing in the star formation process.The numerous filaments identified in the molecular cloud also prove to have rather low densities, and are very stable against gravitational collapse. Most filaments are starless, but they show signs of longitudinal and radial fragmentation, which indicates that star formation might occur later on.

The Structure of Molecular Clouds

Author : Jonathan H. Rowles
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (779 download)

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Book Synopsis The Structure of Molecular Clouds by : Jonathan H. Rowles

Download or read book The Structure of Molecular Clouds written by Jonathan H. Rowles and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Science of Fractal Images

Author : Heinz-Otto Peitgen
Publisher : Springer Science & Business Media
ISBN 13 : 146123784X
Total Pages : 328 pages
Book Rating : 4.4/5 (612 download)

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Book Synopsis The Science of Fractal Images by : Heinz-Otto Peitgen

Download or read book The Science of Fractal Images written by Heinz-Otto Peitgen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on notes for the course Fractals:lntroduction, Basics and Perspectives given by MichaelF. Barnsley, RobertL. Devaney, Heinz-Otto Peit gen, Dietmar Saupe and Richard F. Voss. The course was chaired by Heinz-Otto Peitgen and was part of the SIGGRAPH '87 (Anaheim, California) course pro gram. Though the five chapters of this book have emerged from those courses we have tried to make this book a coherent and uniformly styled presentation as much as possible. It is the first book which discusses fractals solely from the point of view of computer graphics. Though fundamental concepts and algo rithms are not introduced and discussed in mathematical rigor we have made a serious attempt to justify and motivate wherever it appeared to be desirable. Ba sic algorithms are typically presented in pseudo-code or a description so close to code that a reader who is familiar with elementary computer graphics should find no problem to get started. Mandelbrot's fractal geometry provides both a description and a mathemat ical model for many of the seemingly complex forms and patterns in nature and the sciences. Fractals have blossomed enormously in the past few years and have helped reconnect pure mathematics research with both natural sciences and computing. Computer graphics has played an essential role both in its de velopment and rapidly growing popularity. Conversely, fractal geometry now plays an important role in the rendering, modelling and animation of natural phenomena and fantastic shapes in computer graphics.

The Structure and Content of Molecular Clouds

Author : Thomas Wilson
Publisher : Springer
ISBN 13 : 9783662139622
Total Pages : 310 pages
Book Rating : 4.1/5 (396 download)

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Book Synopsis The Structure and Content of Molecular Clouds by : Thomas Wilson

Download or read book The Structure and Content of Molecular Clouds written by Thomas Wilson and published by Springer. This book was released on 2013-11-13 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of a workshop held in Schloß Ringberg to assess developments in molecular cloud research over the last 25 years, and to discuss trends for future research in the field of molecular line astronomy. The topics include the morphology, formation, and lifetimes of molecular clouds, and their relation to star formation. Also, the chemical and isotopic content of these clouds is reviewed, and comparisons with molecular clouds in external galaxies are made. This rather complete survey of this important field of research addresses researchers in astronomy and students alike.

Origins of the Earth, Moon, and Life

Author : Akio Makishima
Publisher : Elsevier
ISBN 13 : 0128120592
Total Pages : 270 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Origins of the Earth, Moon, and Life by : Akio Makishima

Download or read book Origins of the Earth, Moon, and Life written by Akio Makishima and published by Elsevier. This book was released on 2017-01-27 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Origins of the Earth, Moon, and Life: An Interdisciplinary Approach presents state-of-the-art knowledge that is based on theories, experiments, observations, calculations, and analytical data from five astro-sciences, astronomy, astrobiology, astrogeology, astrophysics, and cosmochemistry. Beginning with the origin of elements, and moving on to cover the formation of the early Solar System, the giant impact model of the Earth and Moon, the oldest records of life, and the possibility of life on other planets in the Solar System, this interdisciplinary reference provides a complex understanding of the planets and the formation of life. Synthesizing concepts from all branches of astro-sciences into one, the book is a valuable reference for researchers in astrogeology, astrophysics, cosmochemistry, astrobiology, astronomy, and other space science fields, helping users better understand the intersection of these sciences. - Includes extensive figures and tables to enhance key concepts - Uses callout boxes throughout to provide context and deeper explanations - Presents up-to-date information on the universe, stars, planets, moons, and life in the solar system - Combines knowledge from the fields of astrogeology, astrophysics, cosmochemistry, astrobiology, and astronomy, helping readers understand the origins of the Earth, the moon, and life in our solar system

The Structure and Evolution of Giant Molecular Clouds

Author : Jonathan Peter Williams
Publisher :
ISBN 13 :
Total Pages : 762 pages
Book Rating : 4.:/5 (33 download)

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Book Synopsis The Structure and Evolution of Giant Molecular Clouds by : Jonathan Peter Williams

Download or read book The Structure and Evolution of Giant Molecular Clouds written by Jonathan Peter Williams and published by . This book was released on 1995 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ultraviolet Astronomy and the Quest for the Origin of Life

Author : Ana I. Gomez de Castro
Publisher : Elsevier
ISBN 13 : 0128191716
Total Pages : 178 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Ultraviolet Astronomy and the Quest for the Origin of Life by : Ana I. Gomez de Castro

Download or read book Ultraviolet Astronomy and the Quest for the Origin of Life written by Ana I. Gomez de Castro and published by Elsevier. This book was released on 2021-03-27 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultraviolet Astronomy and the Quest for the Origin of Life addresses the use of astronomical observations in the ultraviolet range to better understand the generation of complex, life-precursor molecules. The origin of RNA is still under debate but seems to be related to the generation of pools of complex organic molecules submitted to heavy cycles of solution in water and drying. This book investigates whether these cycles require a planetary surface or may occur in space by examining both the theoretical and observational aspects of the role of UV radiation in the origin of life. This book offers the latest advances in these studies for astronomers, astrobiologists and planetary scientists. - Addresses both the theoretical and observational aspects of the role of Ultraviolet (UV) radiation in the origin of life - Builds on the requirements to produce prebiotic molecules in space and the implications for the origin of RNA - Investigates the use of ultraviolet observations related to planetary system formation, the evolution of young planetary disks, and the interaction of stars with planetary atmospheres

The Small-scale Structure of Molecular Clouds

Author : Michael Paul Hobson
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (62 download)

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Book Synopsis The Small-scale Structure of Molecular Clouds by : Michael Paul Hobson

Download or read book The Small-scale Structure of Molecular Clouds written by Michael Paul Hobson and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Large-scale Structure of Molecular Clouds

Author : Jan Gerard Amos Wouterloot
Publisher :
ISBN 13 :
Total Pages : 234 pages
Book Rating : 4.X/5 (1 download)

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Book Synopsis The Large-scale Structure of Molecular Clouds by : Jan Gerard Amos Wouterloot

Download or read book The Large-scale Structure of Molecular Clouds written by Jan Gerard Amos Wouterloot and published by . This book was released on 1981 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Micro- and Macro- Physics of Giant Molecular Cloud Formation

Author : Kendall P. Hall
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (128 download)

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Book Synopsis The Micro- and Macro- Physics of Giant Molecular Cloud Formation by : Kendall P. Hall

Download or read book The Micro- and Macro- Physics of Giant Molecular Cloud Formation written by Kendall P. Hall and published by . This book was released on 2021 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Giant molecular clouds are the birthplaces of stars, stars which gift back enriched gas, more endowed with metals than the gas they were formed from.Giant molecular clouds, as the formation sites of stars, are integral to the understanding of galaxy structure formation, star-formation, and ultimately the creation of life-bearing planets. They are complex structures, forming through difference mechanisms, all of which are important to study. For stars to be able to form, cool, molecular gas must exist. This work adds to the growing understanding of how molecules form on small scales,specifically how to trace molecular hydrogen gas that does not have corresponding CO emission: ``CO-dark" molecular hydrogen gas. Many tracers are suggested in the literature, but this thesis focuses on the use of the 158 micron line of C+, the 18 cm lines of OH, and the 9 cm lines of CH as diffuse gas tracers. They are studied in the context of two photodissociation regions/cloud boundaries in the Perseus giant molecular cloud. [CII] emission is found to better correlate with neutral atomic gas, whereas OH correlates well with visual extinction and molecular hydrogen depending on the gas density, and CH correlates best with molecular hydrogen. The conversion between CH integrated intensity and molecular hydrogen column density has less scatter than any other conversion factor, including those for 12CO, OH, and [CII]. This work also encompasses the formation of giant molecular clouds on larger scales. A currently ongoing project aims to study thermal pressure across an individual molecular cloud, for the first time showing observationally how the pressure changes within the different environments of a single cloud.

On the Structure and Dynamics of Non Star Forming Molecular Clouds

Author : Andreas Heithausen
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.:/5 (17 download)

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Book Synopsis On the Structure and Dynamics of Non Star Forming Molecular Clouds by : Andreas Heithausen

Download or read book On the Structure and Dynamics of Non Star Forming Molecular Clouds written by Andreas Heithausen and published by . This book was released on 1999 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Earth as an Evolving Planetary System

Author : Kent C. Condie
Publisher : Academic Press
ISBN 13 : 0123852285
Total Pages : 593 pages
Book Rating : 4.1/5 (238 download)

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Book Synopsis Earth as an Evolving Planetary System by : Kent C. Condie

Download or read book Earth as an Evolving Planetary System written by Kent C. Condie and published by Academic Press. This book was released on 2011-08-22 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earth as an Evolving Planetary System, Second Edition, explores key topics and questions relating to the evolution of the Earth's crust and mantle over the last four billion years. This updated edition features exciting new information on Earth and planetary evolution and examines how all subsystems in our planet—crust, mantle, core, atmosphere, oceans and life—have worked together and changed over time. It synthesizes data from the fields of oceanography, geophysics, planetology, and geochemistry to address Earth's evolution. This volume consists of 10 chapters, including two new ones that deal with the Supercontinent Cycle and on Great Events in Earth history. There are also new and updated sections on Earth's thermal history, planetary volcanism, planetary crusts, the onset of plate tectonics, changing composition of the oceans and atmosphere, and paleoclimatic regimes. In addition, the book now includes new tomographic data tracking plume tails into the deep mantle. This book is intended for advanced undergraduate and graduate students in Earth, Atmospheric, and Planetary Sciences, with a basic knowledge of geology, biology, chemistry, and physics. It also may serve as a reference tool for structural geologists and professionals in related disciplines who want to look at the Earth in a broader perspective. - Kent Condie's corresponding interactive CD, Plate Tectonics and How the Earth Works, can be purchased from Tasa Graphic Arts here: http://www.tasagraphicarts.com/progptearth.html - Two new chapters on the Supercontinent Cycle and on Great Events in Earth history - New and updated sections on Earth's thermal history, planetary volcanism, planetary crusts, the onset of plate tectonics, changing composition of the oceans and atmosphere, and paleoclimatic regimes - Also new in this Second Edition: the lower mantle and the role of the post-perovskite transition, the role of water in the mantle, new tomographic data tracking plume tails into the deep mantle, Euxinia in Proterozoic oceans, The Hadean, A crustal age gap at 2.4-2.2 Ga, and continental growth

Physical Processes in Interstellar Clouds

Author : G.E. Morfill
Publisher : Springer Science & Business Media
ISBN 13 : 9400939450
Total Pages : 551 pages
Book Rating : 4.4/5 (9 download)

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Book Synopsis Physical Processes in Interstellar Clouds by : G.E. Morfill

Download or read book Physical Processes in Interstellar Clouds written by G.E. Morfill and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the result of a meeting held in August, 1986 in Irsee, West Germany. As the title suggests, the aim of the meeting was to discuss physical processes in interstellar clouds, determine the current status, aims and future direction of the research in this area. Interstellar clouds contain nearly all the mass of diffuse gas in our galaxy, some 10% of the total galactic mass. They represent the birth site for stars and the final "dumping ground" for matter ejected from stars (winds, ex plosive ejecta) and thus play an integral part in the galactic recycling of material. Not only are the clouds important for the structure and evolution of our galaxy, they are also interesting objects of study "per se". Because of their vast scales (up to about 100 parsec), extreme temperatures (as low as about lOOK), and long life 8 times (estimated a about 10 years) a number of physical and chemical processes occur in these environments, which we are not able to study elesewhere, certainly not in laboratories. It is for this reason that the meeting, and hence this book, was organized in such a way that firstly the latest observational results were sum m~ized, going from the global, large scales, to finer details and dynamics, then progressing onwards to the processes -dynamical, chemical, electromagnetic, etc.

The Structure of Interstellar Molecular Clouds: Observations and _D63-variance [Delta-variance] Analysis

Author : Frank Bensch
Publisher :
ISBN 13 : 9783934389366
Total Pages : 163 pages
Book Rating : 4.3/5 (893 download)

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Book Synopsis The Structure of Interstellar Molecular Clouds: Observations and _D63-variance [Delta-variance] Analysis by : Frank Bensch

Download or read book The Structure of Interstellar Molecular Clouds: Observations and _D63-variance [Delta-variance] Analysis written by Frank Bensch and published by . This book was released on 1999 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Structure of Interstellar Molecular Clouds

Author : Loretta Campeggio
Publisher :
ISBN 13 :
Total Pages : 149 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis The Structure of Interstellar Molecular Clouds by : Loretta Campeggio

Download or read book The Structure of Interstellar Molecular Clouds written by Loretta Campeggio and published by . This book was released on 2003 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Protostars and Planets III

Author : Eugene Howard Levy
Publisher :
ISBN 13 :
Total Pages : 1622 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Protostars and Planets III by : Eugene Howard Levy

Download or read book Protostars and Planets III written by Eugene Howard Levy and published by . This book was released on 1993 with total page 1622 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous Space Science Series volumes Protostars and Planets (1978) and Protostars and Planets II (1985) were among the most timely offerings of this illustrious collection of technical works. Now Protostars and Planets III continues to address fundamental questions concerning the formation of stars and planetary systems in general and of our solar system in particular. Drawing from recent advances in observational, experimental, and theoretical research, it summarizes our current understanding of these processes and addresses major open questions and research issues. Among the more notable subjects covered in the more than three dozen chapters are the collapse of clouds and the formation and evolution of stars and disks; nucleosynthesis and star formation; the occurrence and properties of disks around young stars; T Tauri stars and their accretion disks; gaseous accretion and the formation of the giant planets; comets and the origin of the Solar-System; and the long-term dynamical evolution and stability of the solar system. Protostars and Planets III reflects the enormous progress made in understanding star and planet formation as a result of new observational capabilities and cooperative research among scientists from diverse fields. As new discoveries continue to be made, it will stand as an unparalleled reference for tomorrow's research.

Protostars and Planets VI

Author : Henrik Beuther
Publisher : University of Arizona Press
ISBN 13 : 0816531242
Total Pages : 945 pages
Book Rating : 4.8/5 (165 download)

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Book Synopsis Protostars and Planets VI by : Henrik Beuther

Download or read book Protostars and Planets VI written by Henrik Beuther and published by University of Arizona Press. This book was released on 2014-12-18 with total page 945 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a conference held in Heidelberg, Germany, July 15-20, 2013.