Download or read book A Sensitive Search for Molecular Gas in High velocity Clouds written by B. P. Wakker and published by . This book was released on 1997 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Velocity Clouds written by Hugo van Woerden and published by Springer Science & Business Media. This book was released on 2006-01-28 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: On the occasion of the retirement of Ulrich Schwarz, a symposium was held in Groningen in May of 1996, celebrating his contributions to the study of the int- stellar medium, including his work on the high-velocity clouds. The coming together of many specialists in the latter ?eld prompted the idea of compiling a book c- taining their contributions, and summarizing the status of our understanding of the high-velocity cloud phenomenon. This seemed especially worthwhile at the time, since many exciting developments were taking place. After the discovery of some H i clouds with high velocities, about 40 years ago, the subject had been dominated by 21-cm observations of H i emission. Starting in the mid-1980s much progress was being made because of the availability of new instruments, such as large ground-based optical telescopes and UV observatories in space. The connections between the work on high-velocity clouds and other studies of the properties of the (hot) interstellar medium also became clearer.
Download or read book The Physics and Chemistry of the Interstellar Medium written by A. G. G. M. Tielens and published by Cambridge University Press. This book was released on 2005-08-25 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher Description
Download or read book High velocity Clouds written by B. P. Wakker and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Velocity Clouds written by Hugo van Woerden and published by Springer Science & Business Media. This book was released on 2004-09-29 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: On the occasion of the retirement of Ulrich Schwarz, a symposium was held in Groningen in May of 1996, celebrating his contributions to the study of the int- stellar medium, including his work on the high-velocity clouds. The coming together of many specialists in the latter ?eld prompted the idea of compiling a book c- taining their contributions, and summarizing the status of our understanding of the high-velocity cloud phenomenon. This seemed especially worthwhile at the time, since many exciting developments were taking place. After the discovery of some H i clouds with high velocities, about 40 years ago, the subject had been dominated by 21-cm observations of H i emission. Starting in the mid-1980s much progress was being made because of the availability of new instruments, such as large ground-based optical telescopes and UV observatories in space. The connections between the work on high-velocity clouds and other studies of the properties of the (hot) interstellar medium also became clearer.
Download or read book Dark Gas the Gas of the Gaps in the Cold ISM written by Emmanuel Donate and published by . This book was released on 2019 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we study the diffuse molecular gas in the high-latitude cloud MBM 53 and the Southern Galactic Hemisphere. In particular, we conduct searches for dark molecular gas using high-sensitivity, high-velocity resolution CO(1-0) measurements, the OH 18 cm main lines, and composite radio and infrared dust spectra in a portion of the diffuse molecular cloud MBM 53. The results of our sensitive CO(1-0) observations increase the amount of CO-detectable molecular gas in MBM 53 by a factor of two with 15 new detections along 88 lines of sight. Our OH measurements find dark gas in 11 of 44 lines of sight overlapping the CO-sampled region. The CO(1-0) detections have AV threshold of 0.25 mag while the OH detection threshold in AV is 0.35 mag. In the composite radio-infrared spectra we found no indications of changes in dust grain size distribution or composition for the lines of sight where we had CO or OH detections compared to nondetections. Overall, we find that CO detections provide better information as to the extent of the borders of MBM 53 but OH detections provide a greater dark gas mass estimate. Finally, we examine the molecular content of a 8́ơ2200 square degree region in Pegasus- Pisces with an estimated dark molecular gas fraction of 59%. Using data from the CO(1-0) Southern Galactic hemisphere, high-latitude survey by Magnani et al. (2000) we re-examined the CO-detectable mass estimates for the region. By averaging all the CO spectra in subsec- tions of varying sizes we decreased the rms of the averaged CO spectra by factors of 3-10, trading spatial resolution for sensitivity. With the new spectra we are able to make mass estimates as a function of sensitivity. Using the optimal estimate, the CO-detectable mass increases from 2200 to 4000 M(́9, thereby decreasing the dark molecular gas fraction in the region to 0.24. In summary, sensitive CO(1-0) and OH 18 cm observations can detect signif- icantly more molecular gas than is revealed by conventional molecular mapping. Thus the dark gas content of molecular clouds is critically dependent on the sensitivity and velocity resolution of the corresponding CO and OH maps.
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.
Download or read book Reprints National Radio Astronomy Observatory Green Bank W Va written by National Radio Astronomy Observatory (U.S.) and published by . This book was released on 1973 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Planets Stars and Stellar Systems written by Gerard Gilmore and published by Springer. This book was released on 2013-02-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is volume 5 of Planets, Stars and Stellar Systems, a six-volume compendium of modern astronomical research, covering subjects of key interest to the main fields of contemporary astronomy. This volume on “Galactic Structure and Stellar Populations”, edited by Gerard F. Gilmore, presents accessible review chapters on Stellar Populations, Chemical Abundances as Population Tracers, Metal-Poor Stars and the Chemical Enrichment of the Universe, The Stellar and Sub-Stellar Initial Mass Function of Simple and Composite Populations, The Galactic Nucleus, The Galactic Bulge, Open Clusters and Their Role in the Galaxy, Star Counts and the Nature of Galactic Thick Disk, The Infrared Galaxy, Interstellar PAHs and Dust, Galactic Neutral Hydrogen, High-Velocity Clouds, Magnetic Fields in Galaxies, Astrophysics of Galactic Charged Cosmic Rays, Gamma-Ray Emission of Supernova Remnants and the Origin of Galactic Cosmic Rays, Galactic Distance Scales, Globular Cluster Dynamical Evolution, Dynamics of Disks and Warps, Mass Distribution and Rotation Curve in the Galaxy, Dark Matter in the Galactic Dwarf Spheroidal Satellites, and History of Dark Matter in Galaxies. All chapters of the handbook were written by practicing professionals. They include sufficient background material and references to the current literature to allow readers to learn enough about a specialty within astronomy, astrophysics and cosmology to get started on their own practical research projects. In the spirit of the series Stars and Stellar Systems published by Chicago University Press in the 1960s and 1970s, each chapter of Planets, Stars and Stellar Systems can stand on its own as a fundamental review of its respective sub-discipline, and each volume can be used as a textbook or recommended reference work for advanced undergraduate or postgraduate courses. Advanced students and professional astronomers in their roles as both lecturers and researchers will welcome Planets, Stars and Stellar Systems as a comprehensive and pedagogical reference work on astronomy, astrophysics and cosmology.
Download or read book Wisconsin Astrophysics written by and published by . This book was released on 1997 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High velocity Molecular Gas from Cold IRAS Sources written by James H. Blackwell and published by . This book was released on 1989 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reports on Astronomy written by Immo Appenzeller and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: IAU Transactions are published as a volume corresponding to each General Assembly. Volume A is produced prior to the Assembly and contains Reports on Astronomy, prepared by each Commission President. The intention is to summarize the astronomical results that have affected the work of the Commission since the production of the previous Reports up to a time which is about one year prior to the General Assembly. Volume B is produced after the Assembly and contains accounts of Commission Meetings which were held, together with other material. The reports included in the present volume range from outline summaries to lengthy compilations and references. Most reports are in English.
Download or read book High Sensitivity Radio Astronomy written by N. Jackson and published by Cambridge University Press. This book was released on 1997-01-28 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enhanced sensitivity radio telescopes are producing dramatic results. An international conference was held in Jodrell Bank to take stock of these advances. This timely volume presents the review articles presented by a host of world experts who gathered at this meeting. We are shown how high sensitivity is advancing our understanding in radio spectral line analysis, radio continuum observations of galaxies, cosmology, pulsars, and radio emission from stars; what new and enhanced instruments are now available and those planned for the future. This volume provides graduate students and researchers with an up-to-date and wide-ranging review of the new and future research possible with high-sensitivity radio telescopes.
Download or read book The First Symposium on the Infrared Cirrus and Diffuse Interstellar Clouds written by Roc M. Cutri and published by . This book was released on 1994 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation. Proceedings of the April, 1993 conference held in Tucson, Arizona. Some 77 contributions are organized under the following headings: absorption and scatterings in diffuse interstellar clouds; infrared spatial and spectral studies; molecular line and HI studies of interstellar clouds; cirrus in external galaxies; dust and organic matter in diffuse interstellar clouds; cloud chemistry; and cloud energetics and dynamics. Annotation c. by Book News, Inc., Portland, Or.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975-11 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Highly ionized gas surrounding high velocity cloud complex C 1 written by Andrew J. Fox and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Astronomy and Astrophysics Abstracts written by S. Böhme and published by Springer Science & Business Media. This book was released on 2013-12-14 with total page 1180 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the reviews: Astronomy and Astrophysics Abstracts has appeared in semi-annual volumes since 1969 and it has already become one of the fundamental publications in the fields of astronomy, astrophysics and neighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. ... The abstracts are classified under more than hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world." Space Science Reviews #1 "Dividing the whole field plus related subjects into 108 categories, each work is numbered and most are accompanied by brief abstracts. Fairly comprehensive cross-referencing links relevant papers to more than one category, and exhaustive author and subject indices are to be found at the back, making the catalogues easy to use. The series appears to be so complete in its coverage and always less than a year out of date that I shall certainly have to make a little more space on those shelves for future volumes." The Observatory Magazine #1
