Results 71 to 80 of about 834,499 (261)

Enhanced cosmic-ray flux toward zeta Persei inferred from laboratory study of H3+ - e- recombination rate

, 2003
The H3+ molecular ion plays a fundamental role in interstellar chemistry, as it initiates a network of chemical reactions that produce many interstellar molecules. In dense clouds, the H3+ abundance is understood using a simple chemical model, from which
A. Al-Khalili, A. Ehlerding, A. J. Huneycutt, A. Neau, AE Orel, B. J. McCall, BD Savage, BJ McCall, BJ McCall, BJ McCall, CM Lindsay, D Strasser, E Herbst, EF van Dishoeck, F. Hellberg, F. Österdahl, G Sundström, G. H. Dunn, H Kreckel, IF Schneider, J. Semaniak, JA Cardelli, JB Paul, M Larsson, M. Larsson, MJ Jensen, N. Djuric, O. Novotny, R Plasil, R. J. Saykally, R. Thomas, RC Bohlin, S Lepp, S. Kalhori, SL Guberman, T Tanabe, T. R. Geballe, TR Geballe, TR Geballe, V Kokoouline, WD Watson   +40 more
core   +1 more source

On the structure of the turbulent interstellar clouds . Influence of the equation of state on the dynamics of 3D compressible flows [PDF]

, 2009
Context. It is well established that the atomic interstellar hydrogen is filling the galaxies and constitutes the building blocks of molecular clouds. Aims. To understand the formation and the evolution of molecular clouds, it is necessary to investigate
E. Audit, P. Hennebelle
semanticscholar   +1 more source

Correlation Patterns of Muon Flux With Vertical Atmospheric Profiles: Insights From Monte Carlo Simulations

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract The production, attenuation, and absorption of secondary cosmic rays (SCR) are influenced by atmospheric parameters such as air pressure and temperature. To reliably correlate SCR flux measurements with atmospheric ionization driven by energetic particle precipitation, these dependencies must be quantified.
A. Al‐Qaaod, V. Pierrard, A. Winant, U. Stolzenberg, I. Ambrozova, M. Sommer, J. Slegl, J. Solc, A. Gkikoudi, A. G. Georgakilas, A. Papayannis, F. S. Krasniqi   +11 more
wiley   +1 more source

Tracing the Layers of Photodissociated Gas in the Trifid Nebula

The Astrophysical Journal
Photodissociated gas bears the signature of the dynamical evolution of the ambient interstellar medium impacted by the mechanical and radiative feedback from an expanding H ii region.
Bhaswati Mookerjea, Göran Sandell
doaj   +1 more source

Turbulent Driving Scales in Molecular Clouds

, 2009
Supersonic turbulence in molecular clouds is a dominant agent that strongly affects the clouds' evolution and star formation activity. Turbulence may be initiated and maintained by a number of processes, acting at a wide range of physical scales.
Anathpindika, Ballesteros-Paredes, Ballesteros-Paredes, Bally, Banerjee, Basu, Bergin, Brunt, Brunt, Brunt, Brunt, Brunt, C. M. Brunt, Dale, Dobbs, Elmegreen, Elmegreen, Falgarone, Glover, Goldsmith, Hartmann, Heitsch, Heyer, Heyer, Heyer, Heyer, Kim, Klessen, Knee, Koda, Larson, Lazarian, Lazarian, M. H. Heyer, M.-M. Mac Low, Mac Low, Mac Low, Mac Low, Matzner, Miesch, Offner, Ossenkopf, Ostriker, Pan, Price, Quillen, Ridge, Ridge, Rosolowsky, Scalo, Schneider, Shu, Stone, Stone, Stone, Swift, Walawender   +56 more
core   +1 more source

Formation of interstellar clouds: Parker instability with phase transitions [PDF]

, 2009
We numerically follow the nonlinear evolution of the Parker instability in the presence of phase transitions from a warm to a cold H i interstellar medium in two spatial dimensions.
T. Mouschovias, M. Kunz, D. Christie
semanticscholar   +1 more source

Physicochemical Constraints on the Abiotic Polymerization of Nucleotides Into RNA

Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 11, November 2025.
Abstract One of the key steps in the origin of life is the polymerization of nucleotides into nucleic acids like RNA. We have quantified the energetic impact of temperature, pressure, and composition on the polymerization of nucleotides into RNA using the Gibbs function. These Gibbs energies have been used to calculate the probability that a nucleotide
D. E. LaRowe, J. M. Dick
wiley   +1 more source

DESTRUCTION OF THE INTERSTELLAR CLOUDS BY THESHOCK WAVES

Odessa Astronomical Publications, 2008
We study the influence of the interstellar cloud structure irregularity on the dynamics of its destruction by a supernova shock wave. It is shown that irregular clouds are destroyed twice quickly as the spherical ones.
E. E. Matvienko, Yu. A. Shchekinov
doaj   +1 more source

Putting the Diffuse Interstellar Bands on the map - literally!

, 2013
In a quest to further our understanding of the diffuse interstellar medium (ISM) as well as the unidentified carriers of the diffuse interstellar bands (DIBs), we are mapping DIBs across the sky using hundreds of hot stars as background torches ...
van Loon, Jacco Th.
core   +1 more source

From Anti‐Van't Hoff Le Bel Molecules of C6NH to Astronomically Relevant and Experimentally Known and Unknown Carbenes

ChemPhysChem, Volume 26, Issue 20, October 15, 2025.
Molecules with a planar tetracoordinate carbon atom serve as reactive intermediates for carbenes. While isomer 2 has been identified in the laboratory, isomer 5 remains elusive to date. Here, four stationary points with a planar tetracoordinate carbon (ptC) atom that are considered as anti‐van't Hoff Le Bel molecules have been computationally ...
Shilpa Shajan, Devipriya Sivadasan, Krishnan Thirumoorthy, Venkatesan S. Thimmakondu   +3 more
wiley   +1 more source