Results 71 to 80 of about 157,868 (337)

Invisible Higgs Decays to Hooperons in the NMSSM

, 2015
The galactic center excess of gamma ray photons can be naturally explained by light Majorana fermions in combination with a pseudoscalar mediator. The NMSSM provides exactly these ingredients.
Butter, Anja, Henrot-Versillé, Sophie, Lafaye, Rémi, Plehn, Tilman, Rauch, Michael, Zerwas, Dirk   +5 more
core   +3 more sources

Mapping the Galactic Center [PDF]

Symposium - International Astronomical Union, 1996
Gas and dust in the inner region of the Galaxy are distributed in a flat, disklike structure. We model the dynamics of this material in the framework of an accretion disk approach, and thus determine the efficiency of the radial transport of mass and angular momentum in the inner ∼ 200 pc of the Galactic Plane. Moreover, this allows us to establish the
W.J. Duschl, S. von Linden, T. Walter, M. Wittkowski   +3 more
openaire   +1 more source

Infalling Gas toward the Galactic Center [PDF]

The Astrophysical Journal, 1999
VLA maps of ammonia emission were made for the Galactic Center region. The NH3(1,1) and NH3(2,2) transitions were observed in three 2' x 2' fields covering Sgr A* and the region 3' immediately south of it. In the central 3 parsecs surrounding Sgr A* we find emission which appears to be associated with the circumnuclear disk (CND), both morphologically ...
Coil, Alison L., Ho, Paul T. P.
openaire   +2 more sources

Unprecedented Spin‐Lifetime of Itinerant Electrons in Natural Graphite Crystals

Advanced Functional Materials, EarlyView.
Graphite exhibits extraordinary spintronic potential, with electron spin lifetimes reaching 1,000 ns at room temperature ‐ over 100 times longer than graphene‐based devices. Magnetic resonance spectroscopy reveals strong anisotropy: out‐of‐plane spins live 50 times longer than their in‐plane counterparts.
Bence G. Márkus, Dávid Beke, Lili Vajtai, András Jánossy, László Forró, Ferenc Simon   +5 more
wiley   +1 more source

Probing the Galactic Diffuse Continuum Emission with COSI

The Astrophysical Journal, 2023
In 2016, the Compton Spectrometer and Imager (COSI) had a successful 46 day flight on board NASA’s Super Pressure Balloon platform. In this work, we report measurements of the Galactic diffuse continuum emission (GDCE) observed toward the inner Galaxy ...
Christopher M. Karwin, Thomas Siegert, Jacqueline Beechert, John A. Tomsick, Troy A. Porter, Michela Negro, Carolyn Kierans, Marco Ajello, Israel Martinez-Castellanos, Albert Shih, Andreas Zoglauer, Steven E. Boggs, (for the COSI Collaboration)   +12 more
doaj   +1 more source

G359.87+0.18: An FR II Radio Galaxy 15 Arcminutes from Sgr A*. Implications for the Scattering Region in the Galactic Center

, 1998
G359.87+0.18 is an enigmatic object located 15' from Sgr A*. It has been variously classified as an extragalactic source, Galactic jet source, and young supernova remnant.
Anantharamaiah K. R., Anish Roshi D., Athreya R. M., Blundell K. M., Carilli C. L., Cohen M. H., Cornwell T. J., Davies R. D., Gray A. D., Inoue M., Isaacman R., James M. Cordes, K. R. Anantharamaiah, Krichbaum T. P., Lindqvist M., Lindqvist M., Namir E. Kassim, Rickett B. J., Rottgering H. J. A., T. Joseph W. Lazio, Tsuboi M., van Langevelde H. J., W. M. Goss   +22 more
core   +2 more sources

Dark matter at the galactic center [PDF]

Nuclear Physics B - Proceedings Supplements, 2000
3 pages, 3 figures, TAUP99, Paris ...
Gondolo, Paolo, Silk, Joseph
openaire   +2 more sources

Self‐Trapped Hole Migration and Defect‐Mediated Thermal Quenching of Luminescence in α‐ and β‐Ga2O3

Advanced Functional Materials, EarlyView.
Temperature‐dependent photoluminescence and first‐principles calculations reveal self‐trapped hole migration as the microscopic origin of thermal quenching in α‐ and β‐Ga2O3. The low migration barrier in α‐Ga2O3 enables defect trapping and enhances blue luminescence, while the higher barrier in β‐Ga2O3 preserves ultraviolet emission at elevated ...
Nima Hajizadeh, Ymir K. Frodason, Clemens Petersen, Benjamin M. Janzen, Luca Sung‐Min Choi, Nils Bernhardt, Felix Nippert, Zbigniew Galazka, Joel B. Varley, Holger von Wenckstern, Lasse Vines, Markus R. Wagner   +11 more
wiley   +1 more source

Thickness‐Dependent Skyrmion Evolution in Fe3GeTe2 During Magnetization Reversal

Advanced Functional Materials, EarlyView.
Thickness‐ and field‐dependent magnetic domain behavior in 2D van der Waals Fe3GeTe2 is studied using Lorentz TEM and micromagnetic simulations. A patch‐like domain phase evolves from skyrmions during magnetization reversal, and step edges between thickness regions act as pinning sites.
Jennifer Garland, John Fullerton, PeiYu Cai, Rabindra Basnet, Santosh Karki Chhetri, Jin Hu, Elton J. G. Santos, Yue Li, Charudatta Phatak, Amanda Petford‐Long   +9 more
wiley   +1 more source

Spectrally Tunable 2D Material‐Based Infrared Photodetectors for Intelligent Optoelectronics

Advanced Functional Materials, EarlyView.
Intelligent optoelectronics through spectral engineering of 2D material‐based infrared photodetectors. Abstract The evolution of intelligent optoelectronic systems is driven by artificial intelligence (AI). However, their practical realization hinges on the ability to dynamically capture and process optical signals across a broad infrared (IR) spectrum.
Junheon Ha, Yingshan Ma, Yong Nam An, Sung‐Un An, Hyeon Hak Jung, Suvi‐Tuuli Varjamo, Jiwon Yoo, Junho Min, Hanvit Kim, Faisal Ahmed, Sang Hoon Chae, Young Min Song, Weiwei Cai, Tawfique Hasan, Zhipei Sun, Dong‐Ho Kang, Hyeon‐Jin Shin, Yunyun Dai, Hoon Hahn Yoon   +18 more
wiley   +1 more source