Results 101 to 110 of about 30,505 (211)
The Effect of an Inert Solid Reservoir on Molecular Abundances in Dense Interstellar Clouds
Open Astronomy, 2012 The question, what is the role of freeze-out of chemical species in determining the molecular abundances in the interstellar gas is a matter of debate.
Kalvāns Juris, Shmeld Ivar
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Lyα Processing of Solid-state Ethanolamine: Potential Precursors to Sugar and Peptide Derivatives
The Astrophysical JournalEthanolamine (EA), a key component of phospholipids, has recently been detected in the interstellar medium within molecular clouds. To understand this observation, laboratory studies of its formation and destruction are essential and should be ...
T. Suhasaria +6 more
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Geomagnetism, volcanoes, global climate change, and predictability. A progress report
Annals of Geophysics, 1994 A model is investigated, by which the encounters of the solar system with dense interstellar clouds ought to trigger either geomagnetic field reversals or excursions, that produce extra electric currents within the Earth dynamo, that cause extra Joule's ...
G. P. Gregori
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Interstellar grain chemistry and organic molecules [PDF]
The detection of prominant infrared absorption bands at 3250, 2170, 2138, 1670 and 1470 cm(-1) (3.08, 4.61, 4.677, 5.99 and 6.80 micron m) associated with molecular clouds show that mixed molecular (icy) grain mantles are an important component of the ...
Allamandola, L. J., Sandford, S. A.
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Molecular and Solid Hydrogen in Dense Interstellar Clouds
The Astrophysical Journal, 1969 Molecular and solid hydrogen in dense interstellar clouds suggested from underabundance of neutral atomic hydrogen, discussing grain ...
P. M. Solomon, N. C. Wickramasinghe
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The Astrophysical JournalIn the denser and colder regions of the interstellar medium (ISM), gas-phase sulfur is depleted by 2 or 3 orders of magnitude with respect to its cosmic abundance. Thus, which species are the main carriers of sulfur is an open question.
Jessica Perrero +4 more
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Multi-Wavelength View of Supernova Remnants
Acta Polytechnica CTU Proceedings, 2014 This contribution gives a very short overview on the emission of supernova remnants and the processes that are responsible for both the thermal and non-thermal origins of the emission, typically observed in radio, X-rays, and up to gamma-rays. We discuss
Manami Sasaki
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Empirical relationships between gas abundances and UV selective extinction [PDF]
Several studies of gas-phase abundances in lines of sight through the outer edges of dense clouds are summarized. These lines of sight have 0.4 less than E(B-V) less than 1.1 and have inferred spatial densities of a few hundred cm(-3). The primary thrust
Joseph, Charles L.
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Desorption of large molecules from grains in dense interstellar clouds
The Astrophysical Journal, 1991 Laboratory data on the nondestructive desorption of whole leucine (131 amu) molecules from surfaces induced by fast, heavy-ion bombardment are used to propose that heavy ions in the cosmic-ray flux may induce desorption of large molecules from the surfaces of grains in molecular, interstellar ...
JOHNSON RE +3 more
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3D Magneto-Hydrodynamic Simulations of Parker Instability with Cosmic Rays
, 2011 This study investigates Parker instability in an interstellar medium (ISM) near the Galactic plane using three-dimensional magneto-hydrodynamic simulations. Parker instability arises from the presence of a magnetic field in a plasma, wherein the magnetic
Beck +12 more
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