Results 71 to 80 of about 2,128 (220)
Novel algorithms for the understanding of the chemical cosmos
, 2015 Molecular data from the interstellar medium (ISM) contain information that holds the key to understanding our chemically controlled cosmos and to unlocking the secrets of our universe.
Makrymallis, A
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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
Small Structures, Volume 7, Issue 2, February 2026.This work describes how to conceive validated mixed machine learned/empirical energy functions based on finite‐sized molecular clusters for condensed phase simulations. Energy functions for pure and heterogeneous systems are one of the backbones for molecular simulation of condensed phase systems.
JingChun Wang +10 more
wiley +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
Sampling the volcanic plumes at Io: Impact speeds and shock conditions
Meteoritics &Planetary Science, Volume 61, Issue 2, Page 241-271, February 2026.Abstract The desire to sample material from the interior of Io, by flying through its volcanic plumes, requires consideration of the flyby speed and the types of sample collection techniques that can be utilized. Low speed collection (1–2.5 km s−1) would require an orbit around Io itself, which is unlikely due to the accumulated radiation dose that ...
M. J. Burchell +2 more
wiley +1 more source
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
doaj +1 more source
Diffuse Interstellar Band Formation in Dense Clouds
, 1976 Measurements of the strengths of the diffuse interstellar bands at 4430, 5780 and 5797 Å show that the bands tend to be weak with respect to extinction in dense interstellar clouds.
Cohen, Judith G., Snow, Theodore P., Jr.
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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
Pressure and Star Formation in LITTLE THINGS Dwarf Irregular Galaxies
The Astrophysical JournalThe surface densities of star formation, Σ _SFR , in 24 dwarf irregular (dIrr) galaxies from the LITTLE THINGS survey are combined with gas surface densities and midplane pressures to examine the correlations found previously for spiral galaxies.
Bruce G. Elmegreen +2 more
doaj +1 more source
Optical interstellar lines in dark clouds [PDF]
, 1973 Observations of the equivalent widths and radial velocities of the interstellar lines of Ca ii, Na i, CH, and CH^+ are presented for 30 stars. A special effort was made to observe stars behind or within dense clouds with up to 3 mag of absorption.
Cohen, Judith G.
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