Results 51 to 60 of about 30,505 (211)

Methanol Formation via the Radical–Radical Reaction of OH and CH3 Radicals Undergoing Transient Diffusion on Ice at 10 to 60 K

The Astrophysical Journal
Methanol (CH _3 OH) is thought to form on interstellar ice dust via successive hydrogenation reactions. The reaction between CH _3 and OH radicals could also conceivably generate methanol at temperatures above approximately 20 K, at which temperature ...
Arisa Iguchi, Hiroshi Hidaka, Atsuki Ishibashi, Masashi Tsuge, Yasuhiro Oba, Naoki Watanabe   +5 more
doaj   +1 more source

FUSE Observations of Molecular Hydrogen in Translucent Interstellar Clouds: The Line of Sight Toward HD 73882 [PDF]

, 2000
We report the results of initial FUSE observations of molecular hydrogen (H2) in translucent clouds. These clouds have greater optical depth than any of the diffuse clouds previously observed for far-UV H2 absorption, and provide new insights into the ...
A. Lecavelier, A. Vidal-Madjar, B-G Andersson, B. D. Savage, B. L. Rachford, C. Gry, D. C. Morton, D. E. Welty, D. G. York, de Boer K. S., E. B. Jenkins, Federman S. R., Gredel R., H. W. Moos, J. M. Shull, J. Tumlinson, K. R. Sembach, M. Lemoine, Mason K. O., P. D. Feldman, R. Ferlet, Richter P., S. D. Friedman, T. P. Snow, W. P. Blair   +24 more
core   +3 more sources

Energetic secondary electrons in dense interstellar clouds

The Astrophysical Journal, 1977
We have calculated the steady-state distribution of secondary electrons in dense interstellar clouds that are produced in collisions between primary cosmic rays and thermal gas atoms. We find that if the magnetic field in such clouds is approx.100 microgauss, then the synchrotron volume emissivity in the clouds is sufficiently large that discrete ...
R. L. Brown, A. P. Marscher
openaire   +1 more source

Composite Single‐Reference and Explicitly Correlated Multireference Calculations on the Mechanism of Pyrrole Pyrolysis

Journal of Physical Organic Chemistry, Volume 39, Issue 4, April 2026.
New calculations have been applied to the pyrolysis of pyrrole under shock‐tube conditions and to the radical‐radical reaction between allyl and •CN at low temperature and pressure, using the same mechanistic scheme for both. ABSTRACT The pyrolysis of pyrrole has previously been studied in shock‐tube experiments and in jet‐stirred reactors. The results
Barry K. Carpenter
wiley   +1 more source

The Mid-Infrared Extinction Law and its Variation in the Coalsack Nebula [PDF]

, 2013
In recent years the wavelength dependence of interstellar extinction from the ultraviolet (UV), optical, through the near- and mid-infrared (IR) has been studied extensively.
Chen, Yang, Gao, Jian, Jiang, B. W., Li, Aigen, Wang, Shu   +4 more
core   +1 more source

Deciphering the “Missing Xenon Paradox” in Celestial Bodies: A Multifaceted Perspective Toward Demystifying This Enigma

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Xenon (Xe) is a heavy noble gas with intriguing chemical properties, such as having several stable isotopes and the ability to form compounds under extreme conditions. Despite the predictions based on cosmochemical models that suggest xenon should be relatively abundant in planetary reservoirs, empirical data indicate a significant depletion ...
Avinash Kumar Both, Avradip Ghosh, Chin Li Cheung   +2 more
wiley   +1 more source

Structure formation in a colliding flow: The Herschel view of the Draco nebula [PDF]

, 2017
The Draco nebula is a high Galactic latitude interstellar cloud likely to have been formed by the collision of a Galactic halo cloud entering the disk of the Milky Way.
Abergel, A., Beelen, A., Blagrave, K., Boulanger, F., Dassas, K., Joncas, G., Lagache, G., Lockman, F. J., Marshall, D. J., Martin, P. G., Miville-Deschênes, M. -A., Salomé, Q.   +11 more
core   +2 more sources

First Principles Rovibronic Absorption Spectra of HF Molecule

Journal of Computational Chemistry, Volume 47, Issue 6, March 5, 2026.
Hydrogen fluoride (HF) is astrophysically important, as it has been detected in sunspots, Venus, red giants, and the interstellar medium, serving as a probe of exoplanet atmospheres. This article presents an ab initio investigation of HF rovibronic spectroscopy, combining high‐level electronic‐structure data with nuclear‐motion solutions and refinement
Nariman Abu El Kher, Maha Shibli, Mahmoud Korek, Sergei N. Yurchenko, Jonathan Tennyson, Nayla El‐Kork   +5 more
wiley   +1 more source

The Flattest Infrared Extinction Curve in Four Isolated Dense Molecular Cloud Cores

The Astrophysical Journal Letters
The extinction curve of interstellar dust in the dense molecular cloud cores is crucial for understanding dust properties, particularly size distribution and composition.
Jun Li, Bingqiu Chen, Biwei Jiang, He Zhao, Botao Jiang, Xi Chen   +5 more
doaj   +1 more source

Discovery and Initial Investigation of a New Low Surface Brightness Planetary Nebula Candidate at High Galactic Latitude

Astronomische Nachrichten, Volume 347, Issue 3, March 2026.
ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik, P. Köchling, S. Kotov, J. Kozok, Y. Galata, L. Magrini, A. Moiseev, M. Nischang, C. Reese, P. Remmel, P. Riepe, T. Zilch, K. Werner   +12 more
wiley   +1 more source