Results 1 to 10 of about 547 (181)
Interstellar hydrocarbons: degradation chemistry in diffuse clouds [PDF]
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT Observations of diffuse clouds showed that they contain a number of simple hydrocarbons [e.g. CH, C2H, (l- and c-)C3H2, and C4H] in abundances that may be difficult to understand on the basis of conventional gas-phase chemical models.
Serena Viti, Zainab Awad, Viti Serena
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On the evolution of diffuse interstellar clouds [PDF]
Monthly Notices of the Royal Astronomical Society, 1992 We have computed models of a diffuse interstellar cloud which illustrate the progression from largely atomic to molecular gas with increasing optical depth. The medium is assumed to evolve isobarically, and the time-dependent chemistry is followed with the aid of a library of about 500 reactions.
G Pineau Des Forêts +2 more
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The CN radical in diffuse interstellar clouds
Astrophysical Journal, 1984 A survey of 15 lines of sight for the CN B /sup 2/..sigma../sup +/--X /sup 2/..sigma../sup +/ interstellar absorption lines shows that the CN column density in diffuse interstellar clouds follows the relation log N(CN)proportionalm log N(H/sub 2/), where mroughly-equal3.
A C Danks, S R Federman, D L Lambert
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Laboratory infrared spectra and fragmentation chemistry of sulfur allotropes [PDF]
Nature CommunicationsSulfur is one of six life-essential elements, but its path from interstellar clouds to planets and their atmospheres is not well known. Astronomical observations in dense clouds have so far been able to trace only 1 percent of cosmic sulfur, in the form ...
Piero Ferrari +4 more
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Pathway to the identification of C 60 + in diffuse interstellar clouds [PDF]
Philosophical Transactions Series A, Mathematical, Physical, and Engineering Sciences, 2016 Katol Filipkowski
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The Astrophysical Journal Letters, 2023 Observations of OH ^+ are used to infer the interstellar cosmic ray ionization rate in diffuse atomic clouds, thereby constraining the propagation of cosmic rays through and the shielding by interstellar clouds, as well as the low energy cosmic ray ...
Ábel Kálosi +14 more
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Diffuse Interstellar Clouds [PDF]
Highlights of Astronomy, 1992 AbstractDiffuse clouds are interstellar objects through which starlight is not greatly extinguished. As a result, many studies rely on ultraviolet and visible measurements. The focus of this review is on spectroscopic work involving atomic and molecular lines. From these measurements, the physical and chemical makeup of the clouds is derived.
David L. Lambert, S. R. Federman
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Boron abundances in diffuse interstellar clouds [PDF]
Proceedings of the International Astronomical Union, 2009 AbstractWe present a comprehensive survey of B abundances in diffuse interstellar clouds from HST/STIS observations along 56 Galactic sight lines. Our sample is the result of a complete search of archival STIS data for the B II λ1362 resonance line, with each detection confirmed by the presence of absorption from other dominant ions at the same ...
Ritchey, A. M. +3 more
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THE ABUNDANCE OF BORON IN DIFFUSE INTERSTELLAR CLOUDS [PDF]
The Astrophysical Journal, 2011 We present a comprehensive survey of boron abundances in diffuse interstellar clouds from observations made with the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope. Our sample of 56 Galactic sight lines is the result of a complete search of archival STIS data for the B II 1362 resonance line, with each detection confirmed by ...
Ritchey, A. M. +3 more
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Molecular Hydrogen and its Proxies HCO+ and CO in the Diffuse Interstellar Medium
The Astrophysical Journal, 2023 There is a robust polyatomic chemistry in diffuse, partially molecular interstellar gas that is readily accessible in absorption at radio/millimeter/submillimeter wavelengths.
Harvey Liszt, Maryvonne Gerin
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