Results 41 to 50 of about 1,867,471 (206)

Correlation‐Driven d‐Band Modifications Promote Chemical Bonding at 3d‐Ferromagnetic Surfaces

Small, EarlyView.
Electron correlation at the oxygen‐passivated Fe(100) surface renormalizes and narrows the Fe d‐bands, enhancing their energetic overlap with the frontier orbitals of adsorbed pentacene. This strengthens hybridization and converts a weakly bound interface into a chemisorbed hybrid system, illustrating how correlation‐tuned d‐bands can be used to ...
David Maximilian Janas, Andreas Windischbacher, Alessandro Sala, Vitaliy Feyer, Iulia Cojocariu, Manuel Gruber, Mehdi Bouatou, Andrea Droghetti, Peter Puschnig, Giovanni Zamborlini, Mirko Cinchetti   +10 more
wiley   +1 more source

Anticorrelation Between Flux and Photon Index of Hard-X-Ray Emission from the Crab

The Astrophysical Journal
Using Swift Burst Alert Telescope event-mode data during gamma-ray burst occurrences, we conduct spectral analysis for the Crab system. From 38 good observations, which span a period of 18 yr from 2006 to 2023, we find that the Crab’s X-ray flux not only
Koothodil Abhijith Augustine, Hsiang-Kuang Chang   +1 more
doaj   +1 more source

Photometric and spectroscopic study of five pre-main sequence stars in the vicinity of NGC 7129 [PDF]

Serbian Astronomical Journal, 2019
We present results from long-term optical photometric and spectroscopic observations of five pre-main sequence stars, located in the vicinity of the bright nebula NGC 7129.
Semkov E.H., Ibryamov S.I., Peneva S.P.
doaj   +1 more source

THE INTEGRATED DIFFUSE X-RAY EMISSION OF THE CARINA NEBULA COMPARED TO OTHER MASSIVE STAR-FORMING REGIONS [PDF]

, 2011
The Chandra Carina Complex Project (CCCP) has shown that the Carina Nebula displays bright, spatially-complex soft diffuse X-ray emission. Here, we “sum up” the CCCP diffuse emission work by comparing the global morphology and spectrum of Carina's ...
L. Townsley, P. Broos, Y. Chu, R. Gruendl, M. Oey, J. Pittard   +5 more
semanticscholar   +1 more source

Conference‐Based Method: Interviewing Elites at Intergovernmental Conferences

Area, EarlyView.
Short Abstract Conferences have increasingly featured within geographical research as sites of knowledge production, performance and contestation. However, this article explores how intergovernmental conferences can be productive sites for geographical fieldwork through elite interviews on research topics such as climate geopolitics and disaster risk ...
Liam Saddington, Katie Peters
wiley   +1 more source

Modeling the X-Ray Emission of the Boomerang Nebula and Implication for Its Potential Ultrahigh-energy Gamma-Ray Emission

The Astrophysical Journal
The Boomerang Nebula is a bright radio and X-ray pulsar wind nebula (PWN) powered by an energetic pulsar, PSR J2229+6114. It is spatially coincident with one of the brightest ultrahigh-energy (UHE; ≥100 TeV) gamma-ray sources, LHAASO J2226+6057.
Xiao-Bin Chen, Xuan-Han Liang, Ruo-Yu Liu, Xiang-Yu Wang   +3 more
doaj   +1 more source

Exploring the high abundance discrepancy in the planetary nebula IC 4663

Frontiers in Astronomy and Space Sciences, 2023
This article presents an in-depth analysis of integral field unit spectroscopy performed on the Galactic planetary nebula (PN) IC 4663, with a primary focus on investigating its physical characteristics, chemical composition, and morphological properties.
M. Mohery, A. Ali, Aya A. Khames, S. Snaid, A. Mindil   +4 more
doaj   +1 more source

THE 15–20 μm EMISSION IN THE REFLECTION NEBULA NGC 2023 [PDF]

, 2011
We present 15–20 μm spectral maps toward the reflection nebula NGC 2023 obtained with the Infrared Spectrograph in short-wavelength, high-resolution mode on board the Spitzer Space Telescope.
E. Peeters, A. Tielens, L. Allamandola, M. Wolfire   +3 more
semanticscholar   +1 more source

Protoplanetary Disk Properties in the Orion Nebula Cluster: Initial Results from Deep, High-resolution ALMA Observations [PDF]

Astrophysical Journal, 2018
We present Atacama Large Millimeter Array 850 μm continuum observations of the Orion Nebula Cluster that provide the highest angular resolution (∼0.″1 ≈ 40 au) and deepest sensitivity (∼0.1 mJy) of the region to date. We mosaicked a field containing ∼225
J. Eisner, H. Arce, N. Ballering, J. Bally, S. Andrews, R. Boyden, J. Francesco, M. Fang, D. Johnstone, J. Kim, R. Mann, B. Matthews, I. Pascucci, L. Ricci, P. Sheehan, J. Williams   +15 more
semanticscholar   +1 more source

Evaluating Investment in Space Programs: A Case for Theoretical Pluralism

Financial Accountability &Management, EarlyView.
ABSTRACT A perennial question repeatedly asked since the early Mercury (USA) and Salyut (then Soviet Union) space programs has been variations on the theme of “how can the cost of space exploration be justified?” This question—which in broad terms constitutes the research question considered in this paper—continues to be directed toward space agencies ...
Basil P. Tucker, Hank C. Alewine
wiley   +1 more source