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Showing 1 to 20 of 249 for “"interstellar"”.
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Relativistic interstellar space flight.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1968. B.S.
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Infrared spectroscopy of interstellar grains
Spectra are presented of interstellar 1120 and CO ices in three molecular douds. The high signal—to—noise in many of these enabled high quality comparisons to be made with laboratory data, constraining mantle constituents and thermal history. CGS 4 spectra of H 2 0 ices in the p Oph cloud were best …
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Modelling interstellar extinction in stellar populations
… the determination of the magnitude of interstellar extinction is critical, due to its effect on the observed brightness and colour of the stars. Extinction is therefore an important factor in deriving scientific information from the colour-magnitude diagrams (CMDs) of stellar …
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Interstellar Gravitational Perturbations of Cometary Orbits
Made available in DSpace on 2014-12-12T00:17:47Z (GMT). No. of bitstreams: 1 7212154.pdf: 2691518 bytes, checksum: 30ec6fe43239395eef63314798ecafec (MD5) Previous issue date: 1971
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The Interstellar Transport of Galactic Cosmic Rays
… interactions of accelerated material with the interstellar medium, and their primary progenitors are used to test the models of the transport of cosmic rays in the Galaxy. Two principal models were tested: the simple leaky-box model and the nested leaky-box model. In the simple leaky-box model, …
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Interstellar turbulence driven by magneto-rotational instability
… the observed rms values of velocities in the interstellar turbulence as it was observed in NGC 1058. We have shown with the simulations that the averaged velocity dispersion of about 5 km/s is a typical number for the MRI-driven turbulence in galaxies, which agrees with observations. The …
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Interstellar Dust and Distances to Planetary Nebulae
Made available in DSpace on 2014-12-10T23:45:12Z (GMT). No. of bitstreams: 1 7219872.pdf: 3519216 bytes, checksum: f7ecce761bb4c7dc9bfcbe0d059e9d55 (MD5) Previous issue date: 1972
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Rotational equilibrium of C2 in interstellar clouds
… of the rotational equilibrium of C2 in interstellar clouds is updated. It is critical for this equilibrium to be well understood if C2 is to be used as a probe of the physical conditions in these clouds. Although new data continues to be published, the model was last updated in 1987. In …
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Turbulence and structure formation in the interstellar medium
The interstellar medium (ISM) structure and dynamics are the result of the interplay between many physical processes such as turbulence, gravity, thermal processes, magnetic fields and cosmic rays which determine the modes of molecular cloud and star formation, and which in turn, define the global …
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Stochastic histories of dust grains in the interstellar medium
… of SUperNOva CONdensateS (SUNOCONS) within the Interstellar Medium (ISM). This is done via a Monte Carlo process where refractory dust grains formed within supernova remnants are subjected to the processes of sputtering and collisional fragmentation in the diffuse phase and accretion within the …
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Scattering and Absorption of X-rays by Interstellar Dust
In dieser Arbeit habe ich die Eigenschaften der interstellaren Staubpartikel untersucht, wie sie sich aus deren Wechselwirkung mit Roentgen strahlung ergeben. Tatsaechlich werden Photonen, die von einer entfernten Punktquelle stammen, von den Staubteilchen nicht nur absorbiert sondern auch in …
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Observations of Large Biologically Important Interstellar and Cometary Molecules
Finally, we discuss the observational results of an extensive survey for biologically interesting molecules toward Comet Hale-Bopp (1995 O1). To date, no large biomolecule has ever been reported toward a comet with an array. The importance of detecting large biomolecules in comets is that in doing …
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Ambipolar Diffusion in Interstellar Clouds: One-Dimensional, Isothermal Collapse
… smaller than fluxes of corresponding masses at interstellar densities. The detailed calculations of collapsing model clouds described in this paper show that the flux-to-mass ratio in cloud cores can decrease by more than 4 orders of magnitude at neutral densities n(,n) < 10('9) cm('-3) due to …
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New Molecular Probes of Astronomical Sources (Interstellar Sources, Comets)
… sources. The primary project involved HCO in interstellar molecular clouds. The observational results include the verification of the identity of interstellar HCO, the confirmation of the C('+)-HCO correlation first suggested by Snyder, Hollis, and Ulich (1976, Ap. J. (Letters), 208, L91), and …
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Ambipolar diffusion in interstellar clouds: One-dimensional, isothermal collapse
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-09T14:05:17Z No. of bitstreams: 1 1983_paleologou.pdf: 2881441 bytes, checksum: 2daf79df8e0b48e52a8eeda9a54d11bd (MD5)
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Interstellar medium properties and star formation in nearby galaxies
We study the properties of the interstellar medium (ISM) of nearby galaxies from The HI Nearby Galaxy Survey (THINGS) by analyzing the shapes of their HI emission velocity profiles. We apply a stacking method to increase the signal-to-noise (S/N) of the profiles and obtain what we call a super …
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Investigation of Interstellar Object Flux Through the Solar System
Currently, the number of interstellar objects through the solar system is a key factor in creating engineering projects that will allow for ISOs to be studied more closely, revealing important information about planetary formation and star system history. Thus, a current observational upper limit …
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Emission and absorption of microwave radiation by interstellar OH.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1967. Ph.D.
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