Results 91 to 100 of about 210,358 (255)

Extraplanar H II Regions in Spiral Galaxies. I. Low-Metallicity Gas Accreting through the Disk-Halo Interface of NGC 4013

, 2018
The interstellar thick disks of galaxies serve as the interface between the thin star-forming disk, where feedback-driven outflows originate, and the distant halo, the repository for accreted gas.
Croxall, Kevin, Howk, J. Christopher, Lehner, Nicolas, Rueff, Katherine M., Savage, Blair D., Wotta, Christopher B.   +5 more
core   +1 more source

[C II] absorption and emission in the diffuse interstellar medium across the Galactic plane [PDF]

, 2014
Aims. Ionized carbon is the main gas-phase reservoir of carbon in the neutral diffuse interstellar medium (ISM) and its 158 μm fine structure transition [C ii] is the most important cooling line of the diffuse ISM.
M. Gerin, M. Gerin, M. Ruaud, J. Goicoechea, A. Gusdorf, A. Gusdorf, B. Godard, B. Godard, M. Luca, M. Luca, E. Falgarone, E. Falgarone, P. Goldsmith, D. Lis, D. Lis, D. Lis, K. Menten, D. Neufeld, T. Phillips, H. Liszt   +19 more
semanticscholar   +1 more source

Revisiting CN− Formation Mechanisms in Electron Collisions with Benzonitrile

ChemPhysChem, Volume 27, Issue 1, January 2026.
This study explores negative ion formation via electron attachment, revealing CN− formation at 3.0 and 7–10 eV. Dissociation pathways are analyzed using G4(MP2) and CASPT2 calculations, highlighting the coupling between the π4* and σ* resonances critical for interstellar chemistry. Radiation‐induced processes in the aromatic cyano compound benzonitrile
Rodrigo Rodrigues, Mónica Mendes, Daniel Bou‐Debes, João Ameixa, Ali Kamali, Oddur Ingólfsson, Samuel Eden, Lucas M. Cornetta, Filipe Ferreira da Silva   +8 more
wiley   +1 more source

The Kinematics of Multiple-Peaked Lyα Emission in Star-Forming Galaxies at z ~ 2-3 [PDF]

, 2012
We present new results on the Lyα emission-line kinematics of 18 z ~ 2-3 star-forming galaxies with multiple-peaked Lyα profiles. With our large spectroscopic database of UV-selected star-forming galaxies at these redshifts, we have determined that ~30 ...
Hainline, Kevin N., Kollmeier, Juna A., Kulas, Kristin R., Shapley, Alice E., Steidel, Charles C., Zheng, Zheng   +5 more
core  

Stellar abundances and molecular hydrogen in high-redshift galaxies -the far-ultraviolet view

, 2006
FUSE spectra of star-forming regions in nearby galaxies are compared to composite spectra of Lyman-break galaxies (LBGs), binned by strength of Lyman alpha emission and by mid-UV luminosity.
Hoopes C. G., Maeder A., Testor G., Trimble V., Vilchez J. M., William C. Keel   +5 more
core   +1 more source

A clumpy-cloud PDR model of the global far-infrared line emission of the Milky Way [PDF]

, 2008
The fractal structure of the interstellar medium suggests that the interaction of UV radiation with the ISM as described in the context of photon-dominated regions (PDR) dominates most of the physical and chemical conditions, and hence the far-infrared ...
Abel, Abel, Anders, Bennett, Boreiko, Brand, Bronfman, C. Kramer, Carral, Clemens, Contursi, Cox, Dahmen, Dame, Draine, Falgarone, Fixsen, Flower, Gierens, Gorti, Graf, Gry, Habing, Heiles, Heithausen, Hollenbach, Howe, J. Stutzki, Jaffe, Kaufman, Kaufman, Kramer, Kramer, Kramer, Kramer, Köster, Launay, M. Cubick, M. Röllig, Malhotra, McKee, McKee, Melnick, Menten, Misiriotis, Mizutani, Mochizuki, Nikola, Petuchowski, Pottasch, Reynolds, Rohlfs, Russell, Russell, Röllig, Röllig, Schilke, Simon, Stacey, Stark, Sternberg, Storey, Stutzki, Stutzki, Stutzki, Störzer, Tielens, Unger, V. Ossenkopf, Watson, Williams, Williams, Williams, Wilson, Wolfire, Wolfire, Wright   +76 more
core   +4 more sources

Entropy Export and Chemical Reactions in Plasmas

Plasma Processes and Polymers, Volume 23, Issue 1, January 2026.
In a non‐equilibrium plasma, energy is transferred to molecules by electron‐impact (1), collisions among excited molecules (2), and Joule heating (3). The entropy balance for this open system relates the energy available per molecule to changes in entropy, which determines plasma‐based gas conversion. ABSTRACT Is plasma truly a “fourth state of matter”?
Dirk Hegemann, Ramses Snoeckx
wiley   +1 more source

The Gaia-ESO Survey: Extracting diffuse interstellar bands from cool star spectra: DIB-based interstellar medium line-of-sight structures at the kpc scale [PDF]

, 2014
Aims. We study how diffuse interstellar bands (DIBs) measured toward distance-distributed target stars can be used to locate dense interstellar (IS) clouds in the Galaxy and probe a line-of-sight (LOS) kinematical structure, a potentially useful tool ...
L. Puspitarini, R. Lallement, C. Babusiaux, H. Chen, P. Bonifacio, L. Sbordone, E. Caffau, S. Duffau, V. Hill, A. Monreal-Ibero, F. Royer, Frédéric Arenou, R., A. Peralta, J. Drew, R. Bonito, J. Lopez-Santiago, E. Alfaro, T. Bensby, A. Bragaglia, E. Flaccomio, A. Lanzafame, E. Pancino, A. Recio-Blanco, R. Smiljanic, M. Costado, C. Lardo, P. Laverny, T. Zwitter   +28 more
semanticscholar   +1 more source

Photon yields of energetic particles in the interstellar medium: An easy way to calculate gamma-ray line emission [PDF]

Astronomy & Astrophysics, 2002
A gamma-ray line production calculation in astrophysics depends on i) the composition and energy source spectrum of the energetic particles, ii) the propagation model, and iii) the nuclear cross sections. The main difficulty for model predictions and data interpretation comes from the fact that the spectrum of the particles which actually interact in ...
Parizot, E., Lehoucq, R.
openaire   +3 more sources

Adsorption of Helium on Cationic or Anionic Tetracene and Pentacene

Small Structures, Volume 7, Issue 1, January 2026.
How does the arrangement of helium atoms that are adsorbed on tetracene or pentacene ions change with increasing coverage? When does the adsorption layer change from 1D to 2D, and to 3D? Is the transition abrupt? Are the helium atoms localized? Is the arrangement the same for cations and anions? What changes as the acene grows in length?
Miriam Kappe, Florent Calvo, Rasif William, Bilal Rasul, Masoomeh Mahmoodi‐Darian, Paul Scheier, Olof Echt   +6 more
wiley   +1 more source