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Radio Recombination Line Observation Of The Cii Region Ngc2023
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Book Synopsis Radio Recombination Line Observation of the CII Region NGC2023 by : Gillian R. Knapp
Download or read book Radio Recombination Line Observation of the CII Region NGC2023 written by Gillian R. Knapp and published by . This book was released on 1974 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reflection nebula NGC 2023 has been observed at four frequencies in a study of its carbon recombination line emission. The observations show the recombination line region to be about 2 pc in diameter, with an average electron density of approximately 0.2/cc and electron temperature of approximately 20K. The electron density increases exponentially near the B1.5 star HD37903, the illuminating star of NGC 2023. The most reasonable interpretation of the observational results is that the carbon emission lines arise in a cold CII region surrounding HD37903. The coexistence of the CII region with a region of enhanced CO emission suggests that the CO in NGC 2023 may be excited by electron collisions. (Author).
Book Synopsis Reprints - National Radio Astronomy Observatory, Green Bank, W. Va by : National Radio Astronomy Observatory (U.S.)
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 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radio Recombination Lines by : P.A. Shaver
Download or read book Radio Recombination Lines written by P.A. Shaver and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since their first detection 15 years ago, radio recombination lines from several elements have been observed in a wide variety of objects including HII regions, planetary nebulae, molecular clouds, the diffuse interstellar medium, and recently, other galaxies. The observations span almost the entire range from 0.1 to 100 GHz, and employ both single djsh and aperture synthesis techniques. The theory of radio recombination lines has also advanced strongly, to the point where it is perhaps one of the best-understood in astro physics. In a parallel development, it has become possible over the last decade to study these same highly-excited atoms in the laboratory; this work provides further confirmation of the theoretical framework. However there has been continuing controversy over the astrophysical interpre tation of radio recombination line observations, especially regarding the role of stimulated emission. A workshop was held in Ottawa on 24-25 August, 1979, bringing together many of the active scientists to review the field and discuss these questions of interpretation. A broad concensus has emerged: the subtleties of the line-formation process are understood, and the conditions under which reliable in formation can easily be extracted from the line measurements are known. It thus appears likely that the emphasis will shift increasingly from the study of the line phenomenon itself to further application in other areas of astrophysics, ranging from physical processes in plasmas (temperatures, densities, ionization structure), to the large-scale properties of our galaxy (abundances, kinematics, structure), and studies of extragalactic systems.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975-10 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Literature 1975, Part 1 by : S. Böhme
Download or read book Literature 1975, Part 1 written by S. Böhme and published by Springer Science & Business Media. This book was released on 2013-04-18 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astronomy and Astrophysics Abstracts, which has appeared in semi-annual volumes since 1969, is de voted to the recording, summarizing and indexing of astronomical publications throughout the world. It is prepared under the auspices of the International Astronomical Union (according to a resolution adopted at the 14th General Assembly in 1970). Astronomy and Astrophysics Abstracts aims to present a comprehensive documentation of literature in all fields of astronomy and astrophysics. Every effort will be made to ensure that the average time interval between the date of receipt of the original literature and publication of the abstracts will not exceed eight months. This time interval is near to that achieved by monthly abstracting journals, com pared to which our system of accumulating abstracts for about six months offers the advantage of greater convenience for the user. Volume 13 contains literature published in 1975 and received before August 15, 1975; some older literature which was received late and which is not recorded in earlier volumes is also included. We acknowledge with thanks contributions to this volume by Dr. J. Bouska, who surveyed journals and publications in the Czech language and supplied us with abstracts in English, and by the Common wealth Scientific and Industrial Research Organization (C.S.I.R.O.), Sydney, for providing titles and abstracts of papers on radio astronomy. We want to acknowledge valuable contributions to this vol ume by Zentralstelle ftir Atomkemenergie-Dokumentation, Leopoldshafen, which supported our ab stracting service by sending us retrospective literature searches.
Download or read book Reprint written by and published by . This book was released on 1974 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements by :
Download or read book Government Reports Announcements written by and published by . This book was released on 1974-11 with total page 1206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sonderdruck - Max-Planck-Institut Für Radioastronomie by : Max-Planck-Institut für Radioastronomie
Download or read book Sonderdruck - Max-Planck-Institut Für Radioastronomie written by Max-Planck-Institut für Radioastronomie and published by . This book was released on 1968 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1974 with total page 1208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1975 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Galactic and Extragalactic Radio Astronomy by : E. Bouton
Download or read book Galactic and Extragalactic Radio Astronomy written by E. Bouton and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: Galactic and Extragalactic Radio Astronomy is a fundamental text for graduate students and professional astronomers and covers all aspects of radio astronomy beyond the solar system. Each chapter is written by a renowned expert in the field and contains a review of a particular area of radio astronomy and presents the latest observations and interpretations as well as an extensive view of the literature (as of 1988). Topics covered include: galactic continuum emission, HII regions, the diffuse interstellar medium, interstellar molecules, astronomical masers, neutral hydrogen, the galactic center, radio stars, supernova remnants, pulsars, extragalactic hydrogen, radio galaxies and quasars, the microwave background, and cosmological radio sources.
Book Synopsis Radio Recombination Lines by : P.A. Shaver
Download or read book Radio Recombination Lines written by P.A. Shaver and published by Springer. This book was released on 1980-03-31 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since their first detection 15 years ago, radio recombination lines from several elements have been observed in a wide variety of objects including HII regions, planetary nebulae, molecular clouds, the diffuse interstellar medium, and recently, other galaxies. The observations span almost the entire range from 0.1 to 100 GHz, and employ both single djsh and aperture synthesis techniques. The theory of radio recombination lines has also advanced strongly, to the point where it is perhaps one of the best-understood in astro physics. In a parallel development, it has become possible over the last decade to study these same highly-excited atoms in the laboratory; this work provides further confirmation of the theoretical framework. However there has been continuing controversy over the astrophysical interpre tation of radio recombination line observations, especially regarding the role of stimulated emission. A workshop was held in Ottawa on 24-25 August, 1979, bringing together many of the active scientists to review the field and discuss these questions of interpretation. A broad concensus has emerged: the subtleties of the line-formation process are understood, and the conditions under which reliable in formation can easily be extracted from the line measurements are known. It thus appears likely that the emphasis will shift increasingly from the study of the line phenomenon itself to further application in other areas of astrophysics, ranging from physical processes in plasmas (temperatures, densities, ionization structure), to the large-scale properties of our galaxy (abundances, kinematics, structure), and studies of extragalactic systems.
Book Synopsis Chemistry in Space by : J. Mayo Greenberg
Download or read book Chemistry in Space written by J. Mayo Greenberg and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the lectures presented at the first course of the Inter national School of Space Chemistry held in Erice (Sicily) from May 10 to May 20 at the 'E. Majorana Centre for Scientific Culture'. The course was attended by 57 participants from 11 countries. The recognition by Professor A. Zichichi that space chemistry is one of the important and rapidly growing scientific disciplines with many and varied appli cations provided the stimulation to initiate this new school. Historically, the study of chemistry in space had its major origins in comets, the solar nebula and circumstellar envelopes before the interstellar medium achieved its current prominence. A remarkably rapid development in interstellar chemistry was precipitated by the discovery of formaldehyde in the late 1960's made possible by the new radio observational techniques. A four atom molecule in interstellar space was indeed a surprise considering that only a short time ear lier there were still arguments about the existence of the simplest of all molecules - the hydrogen molecule. The application of ion-molecule reactions to interstellar cloud chemistry provided a rich variety of new possibilities which were, however, continuously under pressure to keep pace with radio-astronomical discoveries of more and more complex molecules.
Book Synopsis Radio Spectroscopy of CII Regions Associated with Reflection Nebulae: NGC 2023, M78 and Others by : Vernon Pankonin
Download or read book Radio Spectroscopy of CII Regions Associated with Reflection Nebulae: NGC 2023, M78 and Others written by Vernon Pankonin and published by . This book was released on 1978 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book IBZ written by Otto Zeller and published by . This book was released on 1976 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annual Review of Astronomy and Astrophysics by : Leo Goldberg
Download or read book Annual Review of Astronomy and Astrophysics written by Leo Goldberg and published by . This book was released on 1978 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides abstracts and full text for articles on astronomy and astrophysics.
