Results 1 to 10 of about 3,592,155 (283)
Model calculations for diffuse molecular clouds [PDF]
Astrophysical Journal, 1974 A steady state isobaric cloud model is developed. The pressure, thermal, electrical, and chemical balance equations are solved simultaneously with a simple one dimensional approximation to the equation of radiative transfer appropriate to diffuse clouds.
W D Langer, A E Glassgold
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Formation of Dust Filaments in the Diffuse Envelopes of Molecular Clouds [PDF]
The Astrophysical Journal, 2021 Abstract The path to understanding star formation processes begins with the study of the formation of molecular clouds. The outskirts of these clouds are characterized by low column densities that allow the penetration of ultraviolet radiation, resulting in a nonnegligible ionization fraction and the charging of the small dust grains ...
Leire Beitia-Antero +2 more
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OH + IN DIFFUSE MOLECULAR CLOUDS [PDF]
The Astrophysical Journal, 2013 Near ultraviolet observations of OH+ and OH in diffuse molecular clouds reveal a preference for different environments. The dominant absorption feature in OH+ arises from a main component seen in CH+ (that with the highest CH+/CH column density ratio), while OH follows CN absorption.
Porras, A. J. +3 more
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Kinetic Jeans instability in FOG framework [PDF]
Scientific ReportsThe key mechanism triggering the complex dynamics of astrophysical structure formation in extensive evolutionary clouds is indeed sourced in the non-local gravitational (Jeans) instability. Motivated by recent astrophysical observations, establishing the
Mritunjoy Das +2 more
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Two populations of diffuse molecular clouds
Astrophysical Journal, 1988 Sensitive CO and (C-13)O measurements have been made toward a number of diffuse clouds and high-latitude molecular clouds (HLCs). The results suggest that the diffuse clouds are an inhomogeneous class of objects which can be separated according to their CO column density.
Leo Blitz, Elizabeth A Lada
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CH observations of diffuse molecular clouds
Astrophysical Journal, 1989 A survey of CH 3.3 GHz emission from a sample of high-latitude molecular clouds, diffuse clouds, and heavily reddened globular clusters is presented. The F = 1-1 main-line transition was detected in every molecular cloud in the sample and in two out of four globular cluster lines of sight. The high rate of detections in the low-extinction high-latitude
Leo Blitz +2 more
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Interstellar shocks and molecular CH/+/ in diffuse clouds
Astrophysical Journal, 1980 The influence of shocks on the abundances of molecules in diffuse interstellar clouds is investigated with special emphasis on molecular CH/sup +/. Idealized shocks with plausible parameters are found to produce column densities for CH/sup +/ in the hot, postshock gas which are comparable with measured values in interstellar clouds (up to about 10/sup ...
Moshe Elitzur, W D Watson
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The contribution of unresolved sources on the gamma-ray spectrum of molecular clouds [PDF]
EPJ Web of Conferences, 2023 Fermi-LAT observations of the large-scale diffuse gamma-ray emission unveiled that in some locations, towards the inner Galaxy, the spectrum of this component is harder than the local one, measured at the Earth position. If this signal is associated with
Vecchiotti Vittoria +3 more
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TRACING TURBULENT AMBIPOLAR DIFFUSION IN MOLECULAR CLOUDS [PDF]
The Astrophysical Journal, 2010 Though flux freezing is a good approximation frequently assumed for molecular clouds, ambipolar diffusion (AD) is inevitable at certain scales. The scale at which AD sets in can be a crucial parameter for turbulence and the star formation process.
Li, Hua-bai +3 more
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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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