Results 121 to 130 of about 853,229 (315)

Atomic and Molecular Phases of the Interstellar Medium [PDF]

open access: yes, 2015
This review covers four current questions in the behavior of the atomic and molecular interstellar medium. These include whether the atomic gas originates primarily in cold streams or hot flows onto galaxies; what the filling factor of cold gas actually is in galactic regions observationally determined to be completely molecular; whether molecular ...
arxiv   +1 more source

Abundances in Diffuse Interstellar Clouds [PDF]

open access: yesHighlights of Astronomy, 1980
Interstellar clouds are concentrations of cold (T ≲ 100 K) neutral gas (cf. Spitzer 1978) which are immersed within an intercloud medium. It is worthwhile to distinguish between diffuse clouds (roughly those with E[B-V] ≳ 0.5) and dark clouds (those with E[B-V] ≳ 0.5). This distinction is useful in the sense that diffuse clouds are relatively warm (T ∼
openaire   +1 more source

Micro‐ and nanoscale studies of insoluble organic matter and C‐rich presolar grains in Murchison and Sutter's Mill in preparation for Bennu sample analysis

open access: yesMeteoritics &Planetary Science, Volume 59, Issue 10, Page 2831-2850, October 2024.
Abstract Samples of B‐type asteroid (101955) Bennu returned by the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS‐REx) spacecraft will provide unique insight into the nature of carbonaceous asteroidal matter without the atmospheric entry heating or terrestrial weathering effects associated with ...
A. N. Nguyen   +7 more
wiley   +1 more source

Gravitational Interstellar Scintillation [PDF]

open access: yesarXiv, 2008
Gravitation could modulate the interstellar scintillation of pulsars in a way that is analogous to refractive interstellar scintillation (RISS). While RISS occurs when a large ionized cloud crosses the pulsar line-of-sight, gravitational interstellar scintillation (GISS) occurs when a compact gravitational deflector lies very near to that line-of-sight.
arxiv  

On the relationship between the continuum of interstellar extinction curves, the 2200 Å bump, and the diffuse interstellar bands [PDF]

open access: yes, 2016
A previous article argued that the antagonism between sight-lines with and without a bump at 2200 \AA\ disappears, and that the observed properties of interstellar extinction can be globally understood, if it is accepted that scattered starlight contaminates the observed spectrum of reddened stars.
arxiv   +1 more source

Aditional Ultra-High-Resolution Observations of Ca+ Ions in the Local Insterstellar Medium [PDF]

open access: yes, 1998
We present ultra-high-resolution (0.35 km s−1 FWHM) observations of the interstellar Ca K line towards seven nearby stars. The spectral resolution was sufficient to resolve the line profiles fully, thereby enabling us to detect hitherto unresolved ...
Crawford, IA, Lallement, R, Welsh, BY
core  

Cosmic-Ray Induced Diffusion in Interstellar Ices

open access: yesOpen Astronomy, 2014
Cosmic rays are able to heat interstellar dust grains. This may enhance molecule mobility in icy mantles that have accumulated on the grains in dark cloud cores.
Kalvāns Juris
doaj   +1 more source

The Fractal Dimension of Projected Clouds

open access: yes, 2005
The interstellar medium seems to have an underlying fractal structure which can be characterized through its fractal dimension. However, interstellar clouds are observed as projected two-dimensional images, and the projection of a tri-dimensional fractal
Beech M.   +9 more
core   +1 more source

Formation of Methanol via Fischer‐Tropsch Catalysis by Cosmic Iron Sulphide

open access: yesChemPhysChem, Volume 25, Issue 17, September 2, 2024.
Periodic quantum mechanical simulations evidence the potentiality to synthesise methanol through a Fischer‐Tropsch mechanism in different astrophysical environments facilitated by the catalytic properties of cosmic FeS grains, which are enhanced by the presence of naturally‐occurring point surface defects.
Berta Martinez‐Bachs   +3 more
wiley   +1 more source

Exotic Clouds in the Local Interstellar Medium [PDF]

open access: yesSpace Science Reviews, 2008
10 pages, refereed, accepted for publication in the proceedings of the "From the Outer Heliosphere to the Local Bubble: Comparisons of New Observations with Theory" conference, Space Science ...
openaire   +4 more sources

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