Results 111 to 120 of about 19,422 (206)

The Contribution of Blazars to the Extragalactic Diffuse Gamma-ray Background and Their Future Spatial Resolution

, 2011
We examine the constraints on the luminosity-dependent density evolution model for the evolution of blazars given the observed spectrum of the diffuse gamma-ray background (DGRB), blazar source-count distribution, and the blazar spectral energy ...
D. J. Thompson, G. Fossati, J. Patrick Harding, J. H. Krolik, Kevork N. Abazajian, P. Padovani, S. C. Kappadath, Steve Blanchet   +7 more
core   +1 more source

TANAMI - Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry

, 2010
We present a summary of the observation strategy of TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry), a monitoring program to study the parsec-scale structure and dynamics of relativistic jets in active galactic nuclei (
A. K. Tzioumis, A. L. Fey, C. Müller, C. Plötz, D. J. Thompson, D. L. Jauncey, E. Ros, G. B. Taylor, G. Tosti, H. Hase, J. A. Zensus, J. E. J. Lovell, J. F. H. Quick, J. Wilms, K. J. Johnston, L. Fuhrmann, M. Böck, M. Kadler, M. Lister, M. S. Dutka, P. G. Edwards, R. A. Gaume, R. Booth, R. Ojha, S. Horiuchi, S. J. Tingay, U. Katz   +26 more
core   +1 more source

Revisiting γ-Ray Emission of the Supernova Remnant RCW 103

The Astrophysical Journal
We analyze more than 15 yr of γ -ray data obtained with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope (Fermi) for the region of the young supernova remnant (SNR) RCW 103, since the nearby source 4FGL J1616.2−5054e ...
Yi Xing, Zhongxiang Wang, Dong Zheng
doaj   +1 more source

Pre-burst events of gamma-ray bursts with light speed variation

Physics Letters B, 2021
Previous researches on high-energy photon events from gamma-ray bursts (GRBs) suggest a light speed variation v(E)=c(1−E/ELV) with ELV=3.6×1017 GeV, together with a pre-burst scenario that hight-energy photons come out about 10 seconds earlier than low ...
Jie Zhu, Bo-Qiang Ma
doaj  

Upper limit on the axion-photon coupling from Markarian 421

Physics Letters B
Markarian421 is a well-known nearby BL Lac blazar at the redshift z=0.031. Many previous works were investigated to constrain the axion-photon coupling from its TeV gamma-ray observations, showing the upper limit on the coupling constant gaγ≲2.0×10−11GeV−
Hai-Jun Li, Wei Chao, Yu-Feng Zhou
doaj  

"Fermi" bubbles are bursting from our galaxy. Their origins remain a mystery. [PDF]

Proc Natl Acad Sci U S A, 2023
Mann A.
europepmc   +1 more source

Testing high energy neutrino emission from the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) sources [PDF]

, 2021
A. Galván-Gaméz, N. Fraija, Edilberto Aguilar-Ruiz, Jagdish C. Joshi, J. A. de Diego, A. Marinelli   +5 more
openalex   +3 more sources

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  

86th Annual Meeting of the Meteoritical Society (2024)

Meteoritics &Planetary Science, Volume 59, Issue S1, Page A1-A468, August 2024.
wiley   +1 more source

Gamma-Ray Bursts Observed by the Transiting Exoplanet Survey Satellite: Prompt Optical Counterparts and Afterglows of Swift-XRT-localized Gamma-Ray Bursts

The Astrophysical Journal
Very few detections have been made of optical flashes contemporaneous with prompt high-energy emission from a gamma-ray burst (GRB). In this work, we present and analyze light curves of GRB-associated optical flashes and afterglows from the Transiting ...
Rahul Jayaraman, Michael Fausnaugh, George R. Ricker, Roland Vanderspek, Geoffrey Mo   +4 more
doaj   +1 more source