Download or read book Dust in Normal and Active Galaxies as Observed by the Infrared Space Observatory and the Hubble Space Telescope written by Maria del Carmen Polletta and published by . This book was released on 2001 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'émission infrarouge et les propriétés des poussières des galaxies de Seyfert à raies étroites et des quasars radio bruyants et radio silencieux sont analysées et discutées.
Download or read book Assessment of Options for Extending the Life of the Hubble Space Telescope written by National Research Council and published by National Academies Press. This book was released on 2005-03-28 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Hubble Space Telescope (HST) has operated continuously since 1990. During that time, four space shuttle-based service missions were launched, three of which added major observational capabilities. A fifth â€" SM-4 â€" was intended to replace key telescope systems and install two new instruments. The loss of the space shuttle Columbia, however, resulted in a decision by NASA not to pursue the SM-4 mission leading to a likely end of Hubble's useful life in 2007-2008. This situation resulted in an unprecedented outcry from scientists and the public. As a result, NASA began to explore and develop a robotic servicing mission; and Congress directed NASA to request a study from the National Research Council (NRC) of the robotic and shuttle servicing options for extending the life of Hubble. This report presents an assessment of those two options. It provides an examination of the contributions made by Hubble and those likely as the result of a servicing mission, and a comparative analysis of the potential risk of the two options for servicing Hubble. The study concludes that the Shuttle option would be the most effective one for prolonging Hubble's productive life.
Download or read book Infrared Interferometric Observations of Dust in the Nuclei of Active Galaxies written by David Raban and published by . This book was released on 2009 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Small Magellanic Cloud written by Petia Yanchulova and published by . This book was released on 2020 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interstellar dust is a ubiquitous component of galaxies, but some of its most fundamental properties are still poorly understood. This work analyzes the average extinction properties of dust in the Small Magellanic Cloud (SMC) through color-magnitude diagrams (CMDs) of resolved stars observed with the Hubble Space Telescope (HST). It also investigates the three-dimensional structure of the SMC, since the galaxy's proximity and dynamic interaction history provide a unique way to simultaneously study both dust extinction and galactic geometry. The observations are taken as part of the Small Magellanic Cloud Investigation of Dust and Gas Evolution (SMIDGE) program examining a 200 x 100 parsec region in the SW bar of the SMC. SMC-like dust extinction is frequently used to correct observations of high-redshift or low-metallicity galaxies due to SMC's own low metallicity. The dust extinction law or curve describing the stellar extinction in magnitudes as a function wavelength is the quantity used for this purpose. Fundamentally, the extinction law holds information about the dust grain size and composition. The SMIDGE survey has made it possible to find the average dust extinction properties in the SMC and build upon the handful of measurements in existence prior to the survey. Chapter 1 is an introduction to the importance of SMC dust extinction curve and galactic geometry measurements, and to the approach taken here to answer questions about these two measurements. Chapter 2 explores the average SMC dust extinction curve through multiband HST photometric observations of evolved red clump stars. The study focuses on the measurement of the slope of the red clump reddening vector from the CMD relying on a simple model which takes into account the extinction curve shape, a log-normal distribution of extinctions, and the distance distribution of the stellar component along the line of sight. The results for the shape of the average SMC extinction curve are consistent with prior measurements, and also point to a significant galactic depth along the line-of-sight, in line with recent studies. Chapter 3describes work on a more complex model for the SMC, using red clump and red giant branch stars on a CMD. The model simulates the dust-stars offset and the stellar distance distribution, yielding the reddened fraction of stars. It also simulates a dust layer with a log-normal extinction distribution $A_V$ - the extinction in magnitudes in the optical $V$ photometric band--with width [sigma]_{A_V}$. This work results in the first detailed dust extinction and 3D geometry properties in a key region in the SMC. It also produces a photometry-based $A_V$ result allowing for a measurement of the dust mass content of the galaxy which is independent from infrared dust emission observations. This is one of a few measurements of $A_V$ at low metallicity which can be compared to gas and dust content measured from infrared emission. Similarly to other photometry-based extinction results in Andromeda and the Milky Way, it points to a potential overestimation of the dust mass derived from dust grain models relying on IR dust emission data. Chapter 4 summarizes this dissertation and describes future work on SMC's dust extinction properties. This future study relies on the results derived in Chapter 3 to obtain a refined SMC average dust extinction curve. It also aims to obtain spatially-resolved maps of the extinction curve and $A_V$ in order to answer questions about the true distribution of SMC extinction curves.
Download or read book Dust in the Universe written by K. S. Krishna Swamy and published by World Scientific. This book was released on 2005 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: - First book to present a comprehensive study of dust in the universe
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dust in Galaxies written by David A Williams and published by Royal Society of Chemistry. This book was released on 2019-12-12 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Without interstellar dust, the Universe as we see it today would not exist. Yet at first we considered this vital ingredient merely an irritating fog that prevented a clear view of the stars and nebulae in the Milky Way and other galaxies. We now know that interstellar dust has essential roles in the physics and chemistry of the formation of stars and planetary systems, the creation of the building blocks of life, and in the movement of those molecules to new planets. This is the story in this book. After introducing the materials this interstellar dust is made of, the authors explain the range of sizes and shapes of the dust grains in the Milky Way galaxy and the life cycle of dust, starting from the origins of dust grains in stellar explosions through to their turbulent destruction. Later on we see the variety of processes in interstellar space involving dust and the events there that cause the dust to change in ways that astronomers and astrobiologists can use to indirectly observe those events. This book is written for a general audience, concentrating on ideas rather than detailed mathematics and chemical formulae, and is the first time interstellar dust has been discussed at an accessible level.
Download or read book Dust in the Galactic Environment written by D.C.B Whittet and published by CRC Press. This book was released on 2018-10-08 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dust is a ubiquitous feature of the cosmos, impinging directly or indirectly on most fields of modern astronomy and astrophysics. Dust in the Galactic Environment, Second Edition provides a thorough overview of the subject, covering general concepts, methods of investigation, important results and their significance, relevant literature, and some suggestions for promising avenues of future research. Since the publication of the first edition of this popular graduate text, major advances have been made in our understanding of astrophysical dust, especially in the light of exciting new results from space- and ground-based telescopes, together with advances in laboratory astrophysics and theoretical modeling. This new, expanded edition highlights the latest results and provides a context for future research opportunities. The first chapter provides a historical perspective for current research and an overview of interstellar environments and the role of dust in astrophysical processes, followed by a discussion of the cosmic history of the chemical elements expected to be present in dust and an examination of the effect of gas-dust interactions on gas phase abundances. The next several chapters describe the observed properties of interstellar grains, such as their extinction, polarization, absorption, and emission characteristics. Then, the book explores the origin and evolution of dust, tracing its life cycle in a succession of environments from circumstellar shells to diffuse interstellar clouds, molecular clouds, protostars, and protoplanetary disks. The final chapter summarizes progress toward a unified model. Dust in other galaxies is discussed as an integral part of the text rather than as a distinct topic requiring separate chapters. Containing extensive references and problems to aid understanding and illustrate basic principles, the book is ideally suited for graduate and advanced undergraduate courses. It will also be an invaluable reference for postgraduate students and researchers working in this important field.
Download or read book Dust in the Universe written by M. E. Bailey and published by CUP Archive. This book was released on 1988-12-15 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dust in the Galactic Environment written by Doug C. B. Whittet and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dust in the Galactic Environment, Third Edition provides a thorough overview of the subject, covering general concepts, methods of investigation, important results and their significance, relevant literature, and some suggestions for promising avenues of future research. Major advances have been made in the last two decades in our understanding of astrophysical dust. These have been driven by discoveries arising from new observational facilities such as the Spitzer, Planck, and Herschel Space Telescopes, as well as important parallel developments in laboratory studies of cosmic and terrestrial analog materials. This new, expanded edition reviews these developments, summarizes the current state of the field, and considers possibilities for future advances, for example with the James Webb Space Telescope. It includes introductory material for new entrants to the field alongside detailed discussion for more advanced students and researchers.
Download or read book A Catalogue of Southern Peculiar Galaxies and Associations written by Halton C. Arp and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Astronomy and Astrophysics in the New Millennium written by National Research Council and published by National Academies Press. This book was released on 2002-02-07 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: In preparing the report, Astronomy and Astrophysics in the New Millenium , the AASC made use of a series of panel reports that address various aspects of ground- and space-based astronomy and astrophysics. These reports provide in-depth technical detail. Astronomy and Astrophysics in the New Millenium: An Overview summarizes the science goals and recommended initiatives in a short, richly illustrated, non-technical booklet.
Download or read book The Cosmic Dust Connection written by J. Mayo Greenberg and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid particles are followed from their creation through their evolution in the Galaxy to their participation in the formation of solar systems like our own, these being now clearly deduced from observations by the Hubble Space Telescope as well as by IR and visual observations of protostellar disks, like that of the famous Beta Pictoris object. The most recent observational, laboratory and theoretical methods are examined in detail. In our own solar system, studies of meteorites, comets and comet dust reveal many features that follow directly from the interstellar dust from which they formed. The properties of interstellar dust provide possible keys to its origin in comets and asteroids and its ultimate origin in the early solar system. But this is a continuing story: what happens to the solid particles in space after they emerge from stellar sources has important scientific consequences since it ultimately bears on our own origins - the origins of solar systems and, especially, of our own earth and life in the universe.
Download or read book Dust and Chemistry in Astronomy written by T.J Millar and published by CRC Press. This book was released on 1993-01-01 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dust is widespread in the galaxy. To astronomers studying stars it may be just an irritating fog, but it is becoming widely recognized that cosmic dust plays an active role in astrochemistry. Without dust, the galaxy would have evolved differently, and planetary systems like ours would not have occurred. To explore and consolidate this active area of research, Dust and Chemistry in Astronomy covers the role of dust in the formation of molecules in the interstellar medium, with the exception of dust in the solar system. Each chapter provides thorough coverage of our understanding of interstellar dust, particularly its interaction with interstellar gas. Aimed at postgraduate researchers, the book also serves as a thorough review of this significant area of astrophysics for practicing astronomers and graduate students.
Download or read book Interstellar Dust and Related Topics written by J. Mayo Greenberg and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: IAU Symposium Number 52 on Interstellar Dust and Related Topics was held at Albany, N.Y., on the campus of the State University of New York at Albany from May 29 to June 2, 1972. The members of the Organizing Committee were: Dr A. D. Code, University of Wisconsin, Madison, Wis., U.S.A. Dr B. D. Donn, Goddard Space Flight Center, Greenbelt, Md., U.S.A. Dr A. Elvius, Stockholm Observatory, Saltsjobaden, Sweden. Dr T. Gehrels, Lunar and Planetary Laboratory, University of Arizona, Tucson, Ariz., U.S.A. Dr J. M. Greenberg (Chairman), State University of New York at Albany, Albany, N.Y., U.S.A. Dr H. C. van de Hulst, Sterrewacht, Leiden, Holland. Dr S. B. Pikel'ner, Sternberg Astronomical Institute, Moscow, U.S.S.R. Dr E. E. Salpeter, Cornell University, Ithaca, N.Y., U.S.A. Dr B. E. Turner, National Radio Astronomy Observatory, Charlottesville, Va., U.S.A. The suggestion was first made in 1971 that a symposium on interstellar grains would be timely. The response to the first preliminary announcement, which was sent out on November 29, 1971, was well beyond our expectations. The meeting was locally sponsored by the State University and by Dudley Observatory. The National Aeronautics and Space Administration and the National Science Foundation con tributed along with the IAU. There were 158 participants of whom 49 were from 15 countries outside the United States. A total of 92 papers were presented.
Download or read book Star Formation Rates of Galaxies written by Andreas Zezas and published by Cambridge University Press. This book was released on 2021-04-29 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Star-formation is one of the key processes that shape the current state and evolution of galaxies. This volume provides a comprehensive presentation of the different methods used to measure the intensity of recent or on-going star-forming activity in galaxies, discussing their advantages and complications in detail. It includes a thorough overview of the theoretical underpinnings of star-formation rate indicators, including topics such as stellar evolution and stellar spectra, the stellar initial mass function, and the physical conditions in the interstellar medium. The authors bring together in one place detailed and comparative discussions of traditional and new star-formation rate indicators, star-formation rate measurements in different spatial scales, and comparisons of star-formation rate indicators probing different stellar populations, along with the corresponding theoretical background. This is a useful reference for students and researchers working in the field of extragalactic astrophysics and studying star-formation in local and higher-redshift galaxies.
Download or read book Diffuse Matter from Star Forming Regions to Active Galaxies written by T.W. Hartquist and published by Springer Science & Business Media. This book was released on 2007-05-02 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
