Results 41 to 50 of about 9,517 (211)

Doppler Broadening and Line-of-sight Effects in Core-collapse Supernovae and Young Remnants

The Astrophysical Journal, 2023
The dynamics and spectral characteristics of supernova ejecta reveal details of the supernova energetics, explosive nucleosynthesis, and evolution of the progenitor.
Taylor Jacovich, Daniel Patnaude, Patrick Slane, Carles Badenes, Shiu-Hang Lee, Shigehiro Nagataki, Dan Milisavljevic   +6 more
doaj   +1 more source

Formation of Uranium Pinacolate from the Reductive Coupling of Acetone

Zeitschrift für anorganische und allgemeine Chemie, Volume 652, Issue 1, January 6, 2026.
Uranium(III) cyclopentadienyl complexes are shown to react with acetone in a pinacol coupling, forming uranium pinacolate complexes. Single crystals obtained from the reaction are the first direct structural proof of the previously proposed metallapinacolate intermediate. 1,2‐Diols are elemental building blocks in organic synthesis.
León Hillers, Lisa Vondung
wiley   +1 more source

New Radio Observations of the Supernova Remnant CTA 1

The Astrophysical Journal
We present new radio images of the supernova remnant (SNR) CTA 1 at 1420 and 408 MHz, and in the 21 cm line of H i observed with the Dominion Radio Astrophysical Observatory Synthesis Telescope and at 1420 MHz observed with the Effelsberg 100 m telescope.
Tam Do, Roland Kothes, Alex S. Hill, Andrew Gray, Patricia Reich, Wolfgang Reich   +5 more
doaj   +1 more source

Stabilizing Anion–Anion Aggregates via Dihydrogen Bonds in Non‐Classical Inorganic Molecules

Aggregate, Volume 7, Issue 1, January 2026.
Despite Coulomb's law, the anionic [o‐FESAN]− cluster forms stable anti‐electrostatic aggregates via short dihydrogen bonds. Experimental (nuclear magnetic resonance, dynamic light scattering, and X‐ray diffraction) and theoretical (density functional theory) studies reveal that C–H···H–B interactions overcome long‐range repulsion, enabling cluster ...
Adnana Zaulet, Miquel Nuez‐Martinez, Pipsa Hirva, Reijo Sillanpää, Francesc Teixidor, Clara Viñas   +5 more
wiley   +1 more source

Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity

Annalen der Physik, Volume 538, Issue 1, January 2026.
This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley   +1 more source

MeerKAT 1.3 GHz Observations of Supernova Remnants

The Astrophysical Journal Supplement Series
We present full Stokes MeerKAT L -band (856–1712 MHz) observations of 36 high-latitude supernova remnants (SNRs). Sensitive, high-dynamic-range images show a wealth of structure. G15.1−1.6 appears to be a H ii region rather than an SNR.
W. D. Cotton, R. Kothes, F. Camilo, P. Chandra, S. Buchner, M. Nyamai   +5 more
doaj   +1 more source

Radial Velocity Monitoring and Analysis of Gaia Astrometry of Selected Intermediate Mass Stars to Constrain Their Multiplicity Status

Astronomische Nachrichten, Volume 347, Issue 1, January 2026.
ABSTRACT We present new radial velocity measurements of 13 selected intermediate mass stars (2–6 M⊙). The measurements were performed between 29 April and 6 September 2024 at the University Observatory Jena using the échelle spectrograph FLECHAS. The radial velocity of eight stars was found to be constant during our spectroscopic monitoring, namely: 17
J. Bätz, M. Mugrauer, K.‐U. Michel, J. Reichert, A. Tschirschky, L. Pietsch, F. Edelmann, R. Neuhäuser   +7 more
wiley   +1 more source

Three-dimensional Velocity Diagnostics to Constrain the Type Ia Origin of Tycho's Supernova Remnant

The Astrophysical Journal
While various methods have been proposed to disentangle the progenitor system for Type Ia supernovae, their origin is still unclear. A circumstellar environment is key to distinguishing between the double-degenerate and single-degenerate (SD) scenarios ...
Hiroyuki Uchida, Tomoaki Kasuga, Keiichi Maeda, Shiu-Hang Lee, Takaaki Tanaka, Aya Bamba   +5 more
doaj   +1 more source

Building a Professional Imaginary of Writing Pedagogy: Working With Teacher Knowledge and Beliefs About Writing

Reading Research Quarterly, Volume 61, Issue 1, January/February/March 2026.
In this paper, The Professional Imaginary of Writing Pedagogy is presented as an ideal. This imaginary brings teacher knowledge about the social imaginary for literacy education into relation with teacher professional knowledge and beliefs about writing, to promote pedagogies and practices for writing that are inclusive, expansive, responsive and ...
Clare Dowdall
wiley   +1 more source

Enhanced Radiation Exposure of Airline Crew and Passengers During the May 2024 Geomagnetic Storm

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract Enhanced radiation at aviation altitudes is a concern for flight crew and passengers. During space weather events, solar flares and coronal mass ejection (CME) driven shocks are sources of energetic particles that can reach Earth's near‐space environment and interact with its magnetic field and atmosphere.
Homayon Aryan, Jacob Bortnik, W. Kent Tobiska, Piyush Mehta, Benjamin Hogan, Rashmi Siddalingappa, Harshitha Challa   +6 more
wiley   +1 more source