Results 61 to 70 of about 460 (205)

2‐D Speed Profile of Negative Cloud‐to‐Ground Lightning Flashes With TGF Emissions

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 15, 16 August 2025.
Abstract We present the two‐dimensional (2‐D) speed profile of six stepped leaders with terrestrial gamma‐ray flashes (TGFs) (observed in 2021 (Abbasi et al., 2024, https://doi.org/10.1029/2024jd041260) and 2022 (Kieu et al., 2024, https://doi.org/10.1029/2024jd041720)) and 94 stepped leaders without TGFs (detected in 2021, 2022, 2023, and 2024). These
Ivan T. Cruz, Marcelo M. F. Saba, Rasha U. Abbasi, José Claudio O. Silva, Gabriel S. Diniz, Ny T. Kieu, Diego R. R. da Silva, Tagianne P. da Silva, Paola B. Lauria   +8 more
wiley   +1 more source

Pulsar Observations with the Fermi Gamma-ray Space Telescope

, 2009
The Large Area Telescope (LAT) on Fermi, launched on 2008 June 11, is a space telescope to explore the high energy gamma-ray universe. The instrument covers the energy range from 20 MeV to 300 GeV with greatly improved sensitivity and ability to localize gamma-ray point sources.
D. Parent
openalex   +3 more sources

The Fermi GBM and LAT follow-up of GW150914

EPJ Web of Conferences, 2017
As the first detection of Gravitation Wave (GW) event arising from the coalescence of two stellar-mass Black Holes (BH) was announced by LIGO, a new era for astronomy began.
Bissaldi E., Connaughton V., Omodei N., Burns E., Goldstein A., Vianello G.   +5 more
doaj   +1 more source

Unraveling the Physics of Quasar Jets: Optical Polarimetry and Implications for the X-ray Emission Process

Galaxies, 2020
Since the launch of Chandra twenty years ago, one of the greatest mysteries surrounding Quasar Jets is the production mechanism for their extremely high X-ray luminosity. Two mechanisms have been proposed. In the first view, the X-ray emission is inverse-
Eric S. Perlman, Devon Clautice, Sayali Avachat, Mihai Cara, William B. Sparks, Markos Georganopoulos, Eileen Meyer   +6 more
doaj   +1 more source

Likely Detection of γ-Ray Pulsations of PSR J1717+4308A in NGC 6341 and Implication of the γ-Ray Millisecond Pulsars in Globular Clusters

The Astrophysical Journal, 2023
We report our analysis results for the globular cluster (GC) NGC 6341 (M92), as a millisecond pulsar (MSP) J1717+4308A has recently been reported found in this GC.
Pengfei Zhang, Yi Xing, Zhongxiang Wang, Wei Wu, Zhangyi Chen   +4 more
doaj   +1 more source

A Review of Ga₂O₃ Heterojunctions for Deep‐UV Photodetection: Current Progress, Methodologies, and Challenges

Advanced Electronic Materials, Volume 11, Issue 9, June 2025.
This paper provides a comprehensive review of the existing literature related to the fundamentals of gallium oxide (Ga2O3), growth methods, substrates, and particularly a focused examination of Ga2O3‐based heterojunctions. Particular attention has also been given to the state‐of‐the‐art Ga2O3‐based heterojunctions for photodetectors. The key challenges
Alfred Moore, Saqib Rafique, Ciaran Llewelyn, Dan Lamb, Lijie Li   +4 more
wiley   +1 more source

Numerical Simulations for Optimizing Small Satellite Constellations for TGF Studies

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 8, 28 April 2025.
Abstract The detection of Terrestrial Gamma ray Flashes (TGFs) from space is mostly made by astrophysics satellites, which only provide single‐point measurements. Future TGF missions could consist in performing simultaneous detection by a detector array in space.
Melody Pallu, Sebastien Celestin, Philippe Laurent   +2 more
wiley   +1 more source

Pre-burst neutrinos of gamma-ray bursters accompanied by high-energy photons

Physics Letters B, 2021
Previous researches on high-energy neutrino events from gamma-ray bursters (GRBs) suggest a neutrino speed variation v(E)=c(1±E/ELVν) with ELVν=(6.4±1.5)×1017 GeV, together with an intrinsic time difference Δtin=(−2.8±0.7)×102 s, which means that high ...
Jie Zhu, Bo-Qiang Ma
doaj   +1 more source

Review on Uniaxial Negative Thermal Expansion of Tr‐Zr Superconductors

MetalMat, Volume 2, Issue 1, March 2025.
In this paper, we review recent research progress of a study of uniaxial negative thermal expansion (NTE) along the c‐axis with transition (Tr) metal zirconide TrZr2 and TrZr3 superconductors. We introduce the unique thermal expansion properties of TrZr2 and TrZr3 and the flexibility of controlling thermal expansion properties.
Yuto Watanabe, Yoshikazu Mizuguchi
wiley   +1 more source

Unveiling the Origin of the Fermi Bubbles

Galaxies, 2018
The Fermi bubbles, two giant structures above and below the Galactic center (GC), are among the most important discoveries of the Fermi Gamma-ray Space Telescope.
H.-Y. Karen Yang, Mateusz Ruszkowski, Ellen G. Zweibel   +2 more
doaj   +1 more source