Results 41 to 50 of about 5,625,011 (180)
High Energy Studies of Astrophysical Dust [PDF]
, 2015 Astrophysical dust -- any condensed matter ranging from tens of atoms to micron sized grains -- accounts for about one third of the heavy elements produced in stars and disseminated into space.
Corrales, Lia Racquel
core +1 more source
The Astrophysical JournalWe generalize the magnetically enhanced radiative torque (MRAT) theory for astrophysical environments described by a dimensionless parameter U /( n _1 T _2 ) with U the radiation strength, n _1 = n _H /(10 cm ^−3 ) the normalized hydrogen density, and ...
Thiem Hoang
doaj +1 more source
Dust dynamic pressure and magnetopause displacement: reasons for non-detection [PDF]
Annales Geophysicae, 2013 In a recent paper, Treumann and Baumjohann (2011) propose that the contribution of dust particles to the solar wind dynamic pressure can cause large compressions of the Earth's magnetopause and suggest that this occurs when Earth encounters ...
I. Mann, M. Hamrin
doaj +1 more source
Abstract Stellar formation in dust-rich galactic regions remains one of the central problems of contemporary astrophysics because it connects the evolution of interstellar matter, the structure of molecular clouds, the emergence of stellar populations, and the long-term chemical and dynamical development of galaxies.
Oleksandr Melnyk, Iryna Kovalenko
openaire +2 more sources
Photochemistry and Photobiology, EarlyView.Thin solid films of pure glycine or alanine (thicknesses ranging from 10 to 700 nm) were prepared on MgF2 windows using a vacuum sublimation/recondensation method. VUV‐UV spectroscopy of these films enabled us to characterize new absorption cross sections for glycine and alanine for VUV‐UV radiations between 120 and 300 nm.
Juliette Pastore +6 more
wiley +1 more source
NanoSIMS-Analyse und hochauflösende Elektronenmikroskopie an präsolaren Silikaten aus roten Riesensternen und Supernovaexplosionen [PDF]
, 2009 This thesis deals with the analysis of “presolar” silicates and oxides by high resolution mass spectrometry and electron microscopy techniques. This “stardust” was identified by its extreme oxygen isotopic anomalies, which point to nucleosynthetic ...
Vollmer, Christian
core
Best Practices in Open and Reproducible Antarctic Marine Sediment Core Research
Perspectives of Earth and Space Scientists, Volume 7, Issue 1, December 2026.Abstract Marine sediment cores from Antarctica are archived by national programs for reuse and resampling by future researchers, creating a resourceful way to conduct Antarctic science. With reduced budgets to conduct Antarctic field work and to collect new sediment cores offshore of the icy continent, the accessibility of these archived cores and ...
L. E. Miller +12 more
wiley +1 more source
The evolution of dust in extreme astrophysical environments
, 2009 Dust is present in almost every astrophysical environment, ranging from circumstellar shells and disks to spiral, elliptical, starburst, and active galaxies, and to pre-galactic objects such as QSO absorption-line and damped Lyα systems.
E. Dwek, A.P. Jones, F. Galliano
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Adsorption of Volatiles on Dust Grains in Protoplanetary Disks
The Astrophysical JournalThe adsorption of volatile molecules onto dust grain surfaces fundamentally influences dust-related processes, including condensation of gas-phase molecules, dust coagulation, and planet formation in protoplanetary disks. Using advanced ab initio density
Lile Wang +4 more
doaj +1 more source
Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.Abstract The carbon dioxide (CO2)/argon (Ar) ratio is a useful tracer of atmospheric circulation on Mars, but it remains observationally poorly constrained in the middle atmosphere, where large‐scale circulation occurs. In this study, we infer the CO2/Ar ratio at the homopause, which marks the upper boundary of the well‐mixed Martian middle atmosphere,
JunFeng Qin +4 more
wiley +1 more source