Results 101 to 110 of about 18,989 (273)
The Extremes in Intra-Night Blazar Variability: The S4 0954+65 Case
Galaxies, 2016 We present results of optical observations of the extremely violently variable blazar S4 0954+65 on intra-night time scales. The object showed flux changes of up to 100% within a few hours.
Rumen Bachev +6 more
doaj +1 more source
Gamma-Ray Cosmology and Tests of Fundamental Physics
Galaxies, 2022 The propagation of gamma-rays over cosmological distances is the subject of extensive theoretical and observational research at GeV and TeV energies. The mean free path of gamma-rays in the cosmic web is limited above 100 GeV due to the production of ...
Jonathan Biteau, Manuel Meyer
doaj +1 more source
Evaluating quasi-periodic variations in the γ-ray light curves of Fermi-LAT blazars [PDF]
Astronomy & Astrophysics, 2019 Context. The detection of periodicities in the light curves of active galactic nuclei (AGNs) could have profound consequences for our understanding of the nature and radiation physics of these objects.
F. A. Benkhali +10 more
semanticscholar +1 more source
Can teaching be taught? Improving teachers' pedagogical skills at scale in rural Peru
Quantitative Economics, Volume 16, Issue 1, Page 185-233, January 2025.We evaluate the impact of a large‐scale teacher coaching program in Peru, a context with high teacher turnover, on teachers' pedagogical skills and student learning. Previous studies find that small‐scale coaching programs can improve teaching of reading and science in developing countries.
Juan F. Castro +4 more
wiley +1 more source
TeV blazars and their distance [PDF]
Proceedings of Cosmic Radiation Fields: Sources in the early Universe — PoS(CRF 2010), 2011 Recently, a new method to constrain the distance of blazars with unknown redshift using combined observations in the GeV and TeV regimes has been developed, with the underlying assumption that the Very High Energy (VHE) spectrum corrected for the absorption of TeV photons by the Extragalactic Background Light (EBL) via photon-photon interaction should ...
Prandini, Elisa +4 more
openaire +4 more sources
Galaxies, 2017 The University of Michigan 26-m paraboloid was dedicated to obtaining linear polarization and total flux density observations of blazars from the mid-1960s until June 2012, providing an unprecedented record tracking centimeter-band variability over ...
Margo F. Aller +2 more
doaj +1 more source
Review of Education, Volume 12, Issue 3, December 2024.Abstract The world map is changing due to waves of immigration, population and demographic changes in mainland Europe and North America. There is a growing need for a more diverse teacher workforce to close the racial and ethnic gap between students and teachers in populations with high diversity.
Eman Abo‐Zaed Arar, Ahmed Tlili
wiley +1 more source
The Blazar Main Sequence [PDF]
The Astrophysical Journal, 2002 26 pages, 2 eps figures, revised version #2, accepted for pubblication in ...
Cavaliere, A., D'Elia, V.
openaire +4 more sources
GeV Variability Properties of TeV Blazars Detected by Fermi-LAT
The Astrophysical Journal Supplement SeriesVariability is a prominent observational feature of blazars. The high-energy radiation mechanism of jets has always been important but is still unclear.
Gege Wang +3 more
doaj +1 more source
Galaxies, 2016 Since the mid-1980s, the shock-in-jet model has been the preferred paradigm to explain radio-band flaring in blazar jets. We describe our radiative transfer model incorporating relativistically-propagating shocks, and illustrate how the 4.8, 8, and 14.5 ...
Margo F. Aller +4 more
doaj +1 more source