Results 71 to 80 of about 668,448 (162)
The C/CO ratio in dense interstellar clouds
The Astrophysical Journal, 1987 The cosmic-ray-induced photodestruction (CRIP) of CO in dense interstellar clouds is investigated by means of numerical simulations to determine the C/CO abundance ratio. The model takes the dependence of C/CO on the rotational temperature, abundance, and velocity distribution of the CO into account.
R. Gredel, S. Lepp, A. Dalgarno
openaire +1 more source
Soft X‐Ray Emission From Saturn's Magnetosheath Part I: 3D Modeling From MHD Data
Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.Abstract Saturn's magnetosheath hosts a mixed population of water‐group neutrals and solar wind plasma. We present a 3‐D model of soft X‐ray emission by ion‐neutral charge exchange in the near‐equatorial magnetosheath. The model employs MHD simulation data of plasma properties at Saturn, Enceladus‐genic neutral populations extrapolated from existing ...
P. C. Rogan +6 more
wiley +1 more source
The Astrophysical JournalInterstellar dust grains are enveloped by ices of frozen molecules in cold, dense regions of the interstellar medium (ISM), which are also observed in the gas phase. Whether a species is in the solid or gaseous state is governed by its binding energy (BE)
Harjasnoor Kakkar +4 more
doaj +1 more source
Space Weather, Volume 24, Issue 5, May 2026.Abstract We report new measurements of high‐energy protons ejected by the sun during the May 2024 Ganon superstorm. Our observations were made by the Neutron Spectrometer (NS) on the Psyche spacecraft, which was located at a solar distance of approximately 2 AU and a Sun‐Earth‐Probe separation angle of 75°.
Madison Liebel +3 more
wiley +1 more source
Numerical studies of collapsing interstellar clouds [PDF]
, 1986 Numerical simulation of the structure and evolution of interstellar clouds was initiated. Steps were taken toward an integrated treatment of the dynamical, thermal, and chemical processes entering model calculations.
Bodenheimer, P. H. +2 more
core
Dense molecular clouds in the SN2008fp host galaxy?
, 2014 Accepted for publication in A&A. Context. Supernovae (SNe) offer a unique opportunity to study physical properties, small-scale structure, and complex organic chem-istry of the interstellar medium (ISM) in different galaxies. Aims.
N. L. J. Cox, F. Patat
core +1 more source
Star Formation by Supernova Implosion
The Astrophysical Journal LettersRecent hydrodynamical simulations of the late stages of supernova remnant (SNR) evolution have revealed that as they merge with the ambient medium, SNRs implode, leading to the formation of dense clouds in their center.
Leonard E. C. Romano +2 more
doaj +1 more source
Valence Threshold Photoionization Spectra of C5$_5$H and C5$_5$H2$_2$ Isomers
ChemPhysChem, Volume 27, Issue 8, 28 April 2026.Mass‐selected threshold photoelectron spectra (TPES) of l‐C5H, HC5H, and c–C3H‐CCH were recorded using double‐imaging photoelectron‐photoion coincidence spectroscopy. These transient species were generated in situ by hydrogen abstraction from cyclopropylacetylene and 1,3‐pentadiyne.
Ugo Jacovella +9 more
wiley +1 more source
The chemistry of dense interstellar clouds [PDF]
, 1991 The basic theme of this program is the study of molecular complexity and evolution in interstellar and circumstellar clouds incorporating the biogenic elements.
Irvine, W. M.
core
Nondiffusive Formation of Acetaldehyde on Interstellar Ices: An Atomistic Perspective
The Astrophysical Journal LettersThe detection of interstellar complex organic molecules (iCOMs), such as acetaldehyde (CH _3 CHO), in cold astrophysical environments challenges standard grain-surface chemistry models, which rely on radical diffusion.
Berta Martínez-Bachs, Albert Rimola
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