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There are a total of 54 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Hydromagnetic wave heating of low density interstellar gas
Author(s): Zweibel, Ellen G.; Ferriere, Katia M.; Shull, J. Michael
Abstract: The origin of the observed wave spectrum for hot gas in the ISM is considered theoretically. The governing equations for the generation, propagation, and dissipation of compressive waves are reviewed, and particular ...
NASA Center: NASA (non Center Specific)
Publication Year: 1988
Added to NTRS: 2004-11-03
Accession Number: 89A20283; Document ID: 19890032912
The two-point correlation function of randomly distributed Lyman alpha clouds
Author(s): Fardal, Mark A.; Shull, J. Michael
Abstract: It is often assumed that Ly-alpha forest clouds are randomly distributed, intergalactic objects that are highly ionized by the UV background produced by quasars. If these assumptions are true, fluctuations in the UV ...
NASA Center: NASA (non Center Specific)
Publication Year: 1993
Added to NTRS: 2004-11-03
Accession Number: 93N26767; Document ID: 19930017578
IUE-IRAS studies of the infrared cirrus
Author(s): Van Steenberg, Michael E.; Shull, J. Michael
Abstract: The 60 and 100 micron cirrus emission around 256 lines of sight in the IRAS all-sky survey was measured, and the flux averages were used to study the distribution, variations, and correlations of the IRAS infrared cirrus ...
NASA Center: NASA (non Center Specific)
Publication Year: 1988
Added to NTRS: 2004-11-03
Accession Number: 89A19321; Document ID: 19890031950
Gamma-ray burst constraints on the galactic frequency of extrasolar Oort Clouds
Author(s): Shull, J. Michael; Stern, S. Alan
Abstract: With the strong Compton Gamma-Ray Observatory/Burst and Transient Source Experiment (CGRO/BATSE) evidence that most gamma-ray bursts do not come from galactic neutron stars, models involving the accretion of a comet onto a ...
NASA Center: NASA (non Center Specific)
Publication Year: 1995
Added to NTRS: 2004-11-03
Accession Number: 95A92145; Document ID: 19950060546
The Local Ly(alpha) Forest: Association of Clouds with Superclusters and Voids
Author(s): Stocke, John T.; Shull, J. Michael; Penton, Steve; Donahue, Megan; Carilli, Chris
Abstract: The Goddard High Resolution Spectrograph aboard the Hubble Space Telescope was used with the G160M grating to obtain high-resolution (6.2 A) spectra of three very bright active galactic nuclei located behind voids in the ...
NASA Center: Goddard Space Flight Center
Publication Year: 1995
Added to NTRS: 2004-11-03
Accession Number: 97N23131; Document ID: 19970022618; Report Number: NAS 1.26:204572, NASA-CR-204572
Diffuse and dark clouds in the interstellar medium
Author(s): De Boer, Klaas S.; Jura, Michael A.; Shull, J. Michael
Abstract: Observations of clouds in the ISM of the Galaxy and the Magellanic Clouds, obtained with the IUE satellite since its launch in 1978, are reviewed. Consideration is given to the techniques used to analyze IUE Maxwellian ...
NASA Center: NASA (non Center Specific)
Publication Year: 1987
Added to NTRS: 2004-11-03
Accession Number: 88A22647; Document ID: 19880035420
The interstellar medium
Author(s): Shull, J. Michael
Abstract: Observations and models of interstellar matter in the Milky Way are reviewed. The general structure of the gas layer, high velocity gas, and heavy element depletion patterns are outlined. The IUE survey of Fe and Si ...
NASA Center: NASA (non Center Specific)
Publication Year: 1986
Added to NTRS: 2004-11-03
Accession Number: 87N19266; Document ID: 19870009833
Noncoeval star formation, starbursts, and the growth of supershells in Ob associations
Author(s): Shull, J. Michael; Saken, Jon M.
Abstract: There is strong evidence that the epoch of massive-star formation in OB associations is spread over intervals of 10-20 Myr as a result of subclustering, continuous or sequential star formation, or delayed collapse of the ...
NASA Center: NASA (non Center Specific)
Publication Year: 1995
Added to NTRS: 2004-11-03
Accession Number: 95A95658; Document ID: 19950064059
IRAS studies of galactic supershells
Author(s): Saken, Jon M.; Shull, J. Michael; Fesen, Robert A.
Abstract: Using IRAS Skyflux images and a new catalog of OB stars in the Cygnus region, a complete infrared supershell surrounding the Cyg OB1 Association was identified. This supershell is seen as a conspicuous, well-defined 2 deg x ...
NASA Center: NASA (non Center Specific)
Publication Year: 1993
Added to NTRS: 2004-11-03
Accession Number: 93N26776; Document ID: 19930017587
The influence of Oort clouds on the mass and chemical balance of the interstellar medium
Author(s): Stern, S. Alan; Shull, J. Michael
Abstract: The contribution of stellar encounters and interstellar erosion to comet cloud mass injection to the ISM is calculated. It is shown that evaporative mass loss from passing stars and SNe results in an average Galactic mass ...
NASA Center: NASA (non Center Specific)
Publication Year: 1990
Added to NTRS: 2004-11-03
Accession Number: 90A46109; Document ID: 19900059054
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