Results 71 to 80 of about 35,391 (195)
Origin of Interstellar Molecules [PDF]
Progress of Theoretical Physics, 1973 It is concluded from a thermochemical calculation that the interstellar molecules in the compact H II regions may be formed in places of high temperature and high pressure. A possibility of the locations of molecular formation may be the prestellar atmospheres, but the atmospheres of late type stars are other possible candidates.
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Studies of interstellar vibrationally-excited molecules [PDF]
Several molecules thus far have been detected in the ISM in vibrationally-excited states, including H2, SiO, HC3N, and CH3CN. In order for vibrational-excitation to occur, these species must be present in unusually hot and dense gas and/or where strong ...
Erickson, N. R. +2 more
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, 2007 The main achievements, current developments and prospects of molecular studies in external galaxies are reviewed. They are put in the context of the results of several decades of studies of molecules in local interstellar medium, their chemistry and ...
Omont, Alain
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ASTROCHEMISTRY AND INTERSTELLAR MOLECULES [PDF]
Publications of The Korean Astronomical Society, 2010 Astrochemistry provides powerful tools to understand various cosmic phenomena, including those in our solar system to the large-scale structure of the universe. In addition, the chemical property of an astronomical body is a crucial factor which governs the evolution of the system. Recent progress in astrophysical theories, computational modelings, and
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Astrochemistry of dust, ice and gas: introduction and overview
, 2014 A brief introduction and overview of the astrochemistry of dust, ice and gas and their interplay is presented, aimed at non-specialists. The importance of basic chemical physics studies of critical reactions is illustrated through a number of recent ...
van Dishoeck, Ewine F.
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Molecules in interstellar space [PDF]
Science, 2019 Astrochemistry Chemistry in space occurs wherever gas is dense and cool enough for chemical bonds to form, producing a wide variety of molecules. These are particularly common in the gas clouds that provide the raw material for star and planet formation. McGuire has cataloged all molecules detected in the interstellar and circumstellar medium.
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The Astrophysical JournalOxygen-containing complex organic molecules are key precursors to biorelevant compounds fundamental for the origins of life. However, the untangling of their interstellar formation mechanisms has just scratched the surface, especially for oxygen ...
Jia Wang +3 more
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Non-equilibrium processes in interstellar molecules [PDF]
The types of nonequilibrium emission and absorption by interstellar molecules are summarized. The observed brightness emission temperatures of compact OH and H2O sources are discussed using the concept of maser amplification.
Strelnitskiy, V. S.
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The Astrophysical Journal LettersHydrogen cyanide (HCN) molecules serve as an important tracer for the chemical evolution of elemental nitrogen in the regions of star and planet formation.
Maksim Ozhiganov +10 more
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Interstellar Molecules in Meteorites [PDF]
Symposium - International Astronomical Union, 1989 Substantial enrichment of deuterium, D, in certain components of chondritic meteorites is interpreted as a record of isotopic fractionation during ion-molecule reactions at the very low temperatures characteristic of dense interstellar clouds. Whether those meteorites still contain the actual molecules that were synthesised in the presolar interstellar
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