منابع مشابه
Testing grain-surface chemistry in massive hot-core regions
Aims. To establish the chemical origin of a set of complex organic molecules thought to be produced by grain surface chemistry in high mass young stellar objects (YSOs). Methods. A partial submillimeter line-survey was performed toward 7 high-mass YSOs aimed at detecting H2CO, CH3OH, CH2CO, CH3CHO, C2H5OH, HCOOH, HNCO and NH2CHO. In addition, lines of CH3CN, C2H5CN, CH3CCH, HCOOCH3, and CH3OCH3...
متن کاملModelling of surface chemistry on an inhomogeneous interstellar grain
Context. Many interstellar molecules are formed through grain surface reactions. These reactions are usually modelled using rate equations, while considering a homogeneous grain with only one type of binding site for each species. However, amorphicity and the irregular character of interstellar dust grains make inhomogeneous grain surfaces much more likely. Aims. The aim of this study is to inv...
متن کاملTesting grain-surface chemistry in hot core regions
Many complex organic molecules have been detected in star-forming regions like CH3OCH3 and CH3CH2CN. Studying their chemistry is important, since these species may eventually be incorporated into circumstellar disks and thus become part of the material from which future planetary systems are made. Two scenarios for their formation have been proposed: grain-surface formation and high-temperature...
متن کاملGas-grain chemistry in cold interstellar cloud cores with a microscopic Monte Carlo approach to surface chemistry
Aims. We have recently developed a microscopic Monte Carlo approach to study surface chemistry on interstellar grains and the morphology of ice mantles. The method is designed to eliminate the problems inherent in the rate-equation formalism to surface chemistry. Here we report the first use of this method in a chemical model of cold interstellar cloud cores that includes both gas-phase and sur...
متن کاملDiffusive grain - surface chemistry involving the atoms and diatomic molecules of two elements
A model of the grain surface chemistry involving the accretion of atoms of two different elements, X and Y, and their reactions to form species X2, XY, and Y2 was examined for a wide range of choices for the values of its three free parameters – the accretion rate of X and Y, the desorption rate of X and the grain surface sweeping time of Y, all considered relative to the grain surface sweeping...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1998
ISSN: 0004-637X,1538-4357
DOI: 10.1086/305942