Results 71 to 80 of about 52,443 (248)
A Modern Look at ‘Interstellar Clouds’ [PDF]
Symposium - International Astronomical Union, 1974 We compare past and present modes of investigation of the structure of the interstellar gas. Many aspects of the interstellar cloud model are invalid.Interstellar optical absorption lines and Hi21-cm emission lines show a number of very large aggregates with properties similar to those of ‘cloud complexes’. At nonzero velocities especially for b<0°,
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Modeling sulfur depletion in interstellar clouds [PDF]
Astronomy & Astrophysics, 2019 Context. The elemental depletion of interstellar sulfur from the gas phase has been a recurring challenge for astrochemical models. Observations show that sulfur remains relatively non-depleted with respect to its cosmic value throughout the diffuse and translucent stages of an interstellar molecular cloud, but its atomic and molecular gas-phase ...
Jacob C. Laas, Paola Caselli
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Phenyl Radical Activates Molecular Hydrogen Through Protium and Deuterium Tunneling
Angewandte Chemie International Edition, Volume 63, Issue 51, December 16, 2024.Activating the strong H2 bond is typically reserved for transition metals, and only a few main group systems can tackle this challenge. Here, we explore a phenyl radical mediated pathway utilizing the photolysis of iodobenzene. The phenyl radical leverages the high C−H bond energy of the forming benzene to drive H2 activation.
Virinder Bhagat +2 more
wiley +1 more source
Magnetic Seismology of Interstellar Gas Clouds: Unveiling a Hidden Dimension
, 2018 Stars and planets are formed inside dense interstellar molecular clouds, by processes imprinted on the 3-dimensional (3D) morphology of the clouds. Determining the 3D structure of interstellar clouds remains challenging, due to projection effects and ...
Tassis, Konstantinos, Tritsis, Aris
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Detection of Deuterated Formaldehyde in Interstellar Clouds [PDF]
The Astrophysical Journal, 1979 AbstractDeuterated formaldehyde has been detected for the first time in interstellar clouds; the observed ratio HDCO/H2CO implies formation by gas phase chemistry.
R. A. Linke +3 more
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Solving the Puzzle of the Carbonic Acid Vibrational Spectrum – an Anharmonic Story
ChemPhysChem, Volume 25, Issue 22, November 18, 2024.The harmonic picture is the basic approximation that allows the prediction of vibrational spectra. However, reality is neither decoupled nor harmonic. This can lead to problems in notation and the assignment of individual bands. Taking anharmonicity and mode coupling into account allows a drastic improvement in spectral clarity.
Jonas Schlagin +5 more
wiley +1 more source
, 2003 The H3+ molecular ion plays a fundamental role in interstellar chemistry, as it initiates a network of chemical reactions that produce many interstellar molecules. In dense clouds, the H3+ abundance is understood using a simple chemical model, from which
A. Al-Khalili +40 more
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Microstructure of the Local Interstellar Cloud and the Identification of the Hyades Cloud [PDF]
, 2001 We analyze high-resolution UV spectra of the Mg II h and k lines for 18 members of the Hyades Cluster to study inhomogeneity along these proximate lines of sight.
Diamond C. J. +14 more
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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
doaj +1 more source
Open Astronomy, 2003 Seven-color photometry in the Vilnius system has been obtained for 420 stars down to V = 16 mag in the area containing the overlapping open clusters NGC 1750 and NGC 1758 in Taurus.
Straižys V. +8 more
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