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Author : Philipp Richter
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.:/5 (248 download)
Download or read book FUV Spectroscopy of Interstellar Molecular Hydrogen Towards the Magellanic Clouds written by Philipp Richter and published by . This book was released on 1999 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Philipp Richter
Publisher :
ISBN 13 : 9783826566981
Total Pages : 91 pages
Book Rating : 4.5/5 (669 download)
Download or read book FUV Absorption Spectroscopy of Interstellar Molecular Hydrogen Towards the Magellanic Clouds written by Philipp Richter and published by . This book was released on 1999 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. Combes
Publisher : Cambridge University Press
ISBN 13 : 9780521782241
Total Pages : 350 pages
Book Rating : 4.7/5 (822 download)
Download or read book Molecular Hydrogen in Space written by F. Combes and published by Cambridge University Press. This book was released on 2000-11-06 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first multi-disciplinary review of our new understanding of molecular hydrogen in space, and its role in the early Universe.
Author : Marko Krco
Publisher :
ISBN 13 :
Total Pages : 269 pages
Book Rating : 4.:/5 (932 download)
Download or read book Measurements and Time Evolution of Atomic and Molecular Hydrogen in Interstellar Clouds written by Marko Krco and published by . This book was released on 2015 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: The timescale over which molecular clouds collapse to form stars is of intense scientific interest. It reflects the support mechanisms which slow collapse such as angular momentum, thermal pressure, turbulence, and ambipolar diffusion, and impacts the chemical make up of the resulting stars and surrounding planets. In this doctoral thesis we obtain lower age limits for a set of molecular clouds by studying the ratio between atomic and molecular hydrogen gas. Clouds are initially entirely, or almost entirely composed of atomic hydrogen (HI), but by the time they form stars they are almost entirely composed of molecular hydrogen (H2). We measure H2 column densities using 13 CO and dust extinction as tracers. In the clouds' interiors, the HI gas is sufficiently shielded from the external radiation field that it cools to temperatures of approximately 10K to 50K, at which point it can absorb the background 21 cm emission from the warm galactic ISM. This HI Narrow Self-Absorption (HINSA) is simple to observe, yet difficult to analyze due to the complexity of the background emission. We present a novel new method of analyzing HINSA spectra which for the first time offers sufficient confidence in the derived column densities that a more sophisticated analysis of the HI/H2 ratio in clouds could be undertaken. We have performed the largest survey of HINSA in clouds carried out to date using the Green Bank Telescope (GBT), and the Five College Radio Observatory (FCRAO). We establish HINSA as a useful tool, and with the large body of data acquired, can move to determine the ages of several clouds. We discovered that the observed HINSA column densities were highly dependent on the unknown shape and orientation of each cloud. Thus we developed a geometryindependent method of determining the density distribution function of molecular clouds. A geometry-independent chemical model then allowed us to determine the lower limits to the ages of 23 clumps within 9 molecular clouds.
Author :
Publisher :
ISBN 13 : 9789171973894
Total Pages : 33 pages
Book Rating : 4.9/5 (738 download)
Download or read book Interstellar Molecules in the Magellanic Clouds written by and published by . This book was released on 1996 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. Jura
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (97 download)
Download or read book Interstellar Clouds and Molecular Hydrogen written by M. Jura and published by . This book was released on 1977 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David J. Hollenbach
Publisher :
ISBN 13 :
Total Pages : 238 pages
Book Rating : 4.:/5 (317 download)
Download or read book Summer School on Interstellar Processes written by David J. Hollenbach and published by . This book was released on 1986 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 298 pages
Book Rating : 4.3/5 (91 download)
Download or read book Wisconsin Astrophysics written by and published by . This book was released on 2002 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Theodore Raymond Gull
Publisher :
ISBN 13 :
Total Pages : 632 pages
Book Rating : 4.E/5 ( download)
Download or read book Observations of Interstellar Molecular Hydrogen and Measurements of Hydrogen and Helium Fluxes from Planetary Nebulae written by Theodore Raymond Gull and published by . This book was released on 1971 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward Luke Fitzpatrick
Publisher :
ISBN 13 :
Total Pages : 41 pages
Book Rating : 4.:/5 (459 download)
Download or read book Ultraviolet Interstellar Absorption Towards Stars in the Small Magellanic Cloud II. SK159 written by Edward Luke Fitzpatrick and published by . This book was released on 1983 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Royal Society (Great Britain)
Publisher :
ISBN 13 :
Total Pages : 186 pages
Book Rating : 4.3/5 (91 download)
Download or read book Molecules in Interstellar Space written by Royal Society (Great Britain) and published by . This book was released on 1982 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Astronomisches Rechen-InstitutARI
Publisher : Springer Science & Business Media
ISBN 13 : 3642517587
Total Pages : 1746 pages
Book Rating : 4.6/5 (425 download)
Download or read book Literature 1997, Part 1 written by Astronomisches Rechen-InstitutARI and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 1746 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astronomy and Astrophysics Abstracts is devoted to the recording, summarizing and indexing of astronomical publications throughout the world. Two volumes are scheduled to appear per year. Volume 67 records 10,903 papers covering besides the classical fields of astronomy and astrophysics such matters as space flights related to astronomy, lunar and planetary probes and satellites, meteorites and interplanetary matter, X rays and cosmic rays, quasars and pulsars. The abstracts are classified under more than one hundred subject categories thus permitting quick surveying of the bulk of material published on the same topic within six months. For instance, this volume records 119 papers on minor planets, 155 papers on supernovae, and 554 papers on cosmology.
Author : Steven Robert Federman
Publisher :
ISBN 13 :
Total Pages : 308 pages
Book Rating : 4.:/5 (639 download)
Download or read book A Model for Diffuse Interstellar Clouds written by Steven Robert Federman and published by . This book was released on 1979 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 1460 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 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.
Author :
Publisher :
ISBN 13 :
Total Pages : 464 pages
Book Rating : 4.3/5 (91 download)
Download or read book Newsletter written by and published by . This book was released on 1992 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Valeska Valdivia
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (962 download)
Download or read book Impact of Radiative Transfer and Chemistry on the Formation of Molecular Clouds written by Valeska Valdivia and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interstellar medium (ISM) is a highly complex system. It corresponds to an intermediate scale between stars and galaxies. The interstellar gas is present throughout the galaxy, filling the volume between stars. A wide variety of coupled processes, such as gravity, magnetic fields, turbulence and chemistry, participate in its evolution, making the modeling of the ISM a challenging problem. A correct description of the ISM requires a good treatment of the magnetohydrodynamics (MHD) equations, gravity, thermal balance, and chemical evolution within the molecular clouds.This thesis work aims at a better understanding of the formation and evolution of molecular clouds, specially how they become "molecular", paying particular attention to the transition HI-to-H2. We have performed ideal MHD simulations of the formation of molecular clouds and the formation of molecular hydrogen under the influence of gravity and turbulence, using accurate estimates for the shielding effects from dust and the self-shielding for H2, calculated with a Tree-based method, able to provide fast estimates of column densities.We find that H2 is formed faster than predicted by the usual estimates due to local density enhancements created by the gas turbulent motions. Molecular hydrogen, formed at higher densities, could then migrate toward low density warmer regions.Total H2 column densities show that the HI-to-H2 transition occurs at total column densities of a few 10^20 cm-2. We have calculated the populations of rotational levels of H2 at thermal equilibrium, and integrated along several lines of sight. These two results reproduce quite well the values observed by Copernicus and FUSE, suggesting that the observed transition and the excited populations could arise as a consequence of the multi-phase structure of molecular clouds. As H2 formation is prior to further molecule formation, warm H2 could possibly allow the development of a warm chemistry, and eventually explain some aspects of the molecular richness observed in the ISM.
Author : Edward L. Fitzpatrick
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (586 download)
Download or read book Ultraviolet Interstellar Absorption Toward HD 5980 in the Small Magellanic Cloud written by Edward L. Fitzpatrick and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
