Results 91 to 100 of about 23,536 (235)

Infrared Colors of the gamma-ray detected blazars

, 2012
Blazars constitute the most enigmatic class of extragalactic gamma-ray sources, and their observational features have been ascribed to a relativistic jet closely aligned to the line of sight.
Abdo, Ackermann, Blandford, Cavaliere, Cutri, Dermer, F. Massaro, G. Tosti, Giommi, Giroletti, Howard A. Smith, J. E. Grindlay, Kovalev, M. Ajello, Massaro, Massaro, Massaro, Massaro, Padovani, Padovani, R. D'Abrusco, Taylor, The Fermi-LAT Collaboration, Wright   +23 more
core   +1 more source

Making “Small Waves of Change”: Dual Language and General Education Teacher Transformation through Instructional Coaching

TESOL Quarterly, Volume 58, Issue 1, Page 138-167, March 2024.
Abstract This multisite qualitative case study explores ways in which instructional coaching focused on English language development (content) and teachers' individual beliefs (process) can help general education and dual language bilingual education elementary teachers work within and through perceived institutional barriers to improve their language ...
Jennifer Renn, Haiyan Li, Woongsik Choi, Wayne Wright, Trish Morita‐Mullaney   +4 more
wiley   +1 more source

A method for setting upper limits to the extragalactic background light with Fermi-LAT and TeV observations of blazars

, 2010
We propose a method for setting upper limits to the extragalactic background light (EBL). Our method uses simultaneous {\em Fermi}-LAT and ground-based TeV observations of blazars and is based on the assumption that the intrinsic spectral energy ...
Abdo, Abdo, Acciari, Aharonian, Aharonian, Albert, Albert, Amelino-Camelia, Atoyan, Béthermin, Böttcher, Błażejowski, Dermer, Dwek, Fazio, Finke, Finke, Georganopoulos, Mannheim, Primack, Razzaque, Salamon, Schrödter, Stanev, Stecker, Stecker   +25 more
core   +1 more source

Long‐term impacts of primary school scholarships: Evidence from Cambodia

Journal of Policy Analysis and Management, Volume 43, Issue 1, Page 10-38, Winter 2024.
ABSTRACT This randomized trial investigates the long‐term effects of a primary school scholarship program in rural Cambodia. We estimate impacts—9 years after program inception—on educational attainment, cognitive skills, socio‐emotional outcomes, labor market outcomes, and well‐being.
Felipe Barrera‐Osorio, Andreas de Barros, Deon Filmer   +2 more
wiley   +1 more source

Multiwavelength modeling of TeV AGN observed by HESS [PDF]

, 2007
The High Energy Stereoscopic System (H.E.S.S.) experiment, a ground-based gamma-ray Cherenkov telescope array located in Namibia, has now detected many extragalactic objects, which redshifts range from z=0.00183 up to z=0.2, possibly more.
Lenain, Jean-Philippe
core   +2 more sources

Detection of Intra-day Variability Timescales of Four High Energy Peaked Blazars with XMM-Newton

, 2010
We selected a sample of 24 XMM-Newton light curves (LCs) of four high energy peaked blazars, PKS 0548-322, ON 231, 1ES 1426+428 and PKS 2155-304. These data comprise continuous light curves of 7.67h to 18.97h in length.
Abdo, Abramowicz, Acciari, Acciari, Acciari, Aharonian, Aharonian, Albert, Albert, Albert, Albert, Alok C. Gupta, Barth, Benlloch, Brinkmann, Camenzind, Chadwick, Chadwick, Cortina, Edelson, Espaillat, Falcone, Garilli, Gehrels, Ghisellini, Gopal-Krishna, Gopal-Krishna, Gupta, Haritma Gaur, Hartman, Hofmann, Horan, Kataoka, Krawczynski, Maier, Maier, Malkan, Markowitz, Marscher, Marshall, Marshall, Massaro, Osterman, Paltani, Paul J. Wiita, Pawel Lachowicz, Petry, Piner, Primack, Rani, Roberts, Sakamoto, Sambruna, Schwartz, Shimmins, Stecker, Superina, Tagliaferri, Tashiro, Tommasi, Urry, Urry, Uttley, Wagner, Wiita, Wolter, Zhang, Zhang, Zhang, Zhang   +69 more
core   +1 more source

BlaST -- A Machine-Learning Estimator for the Synchrotron Peak of Blazars [PDF]

, 2022
Theo Glauch, Tobias Kerscher, P. Giommi
openalex   +1 more source

Exploring γ-Ray Flares from High-Redshift Blazar B3 1343+451 at GeV Energies

Universe
We study the temporal and spectral variability properties of the high-redshift blazar B3 1343+451 utilizing Fermi-LAT data from 2008 to 2022 in the energy range of 0.1–300 GeV.
Xiongfei Geng, Yang Liu, Gang Cao, Jing Fan, Xiongbang Yang, Nan Ding, Minghu Gao, Yehui Yang, Zhijie Zhang   +8 more
doaj   +1 more source

The physical properties of candidate neutrino-emitter blazars [PDF]

EPJ Web of Conferences
High-energy neutrinos detected by the IceCube Observatory provide a unique opportunity to study the origin of cosmic rays and the nature of the sources producing them.
Azzollini A., Buson S., Coleiro A., Fichet de Clairfontaine G., Pfeiffer L., Sanchez Zaballa J. M., Boughelilba M., Lincetto M.   +7 more
doaj   +1 more source

Diagnosing Magnetic Field Geometry in Blazar Jets Using Multi-Frequency, Centimeter-Band Polarimetry and Radiative Transfer Modeling

Galaxies, 2020
We use multi-frequency linear polarization observations from the University of Michigan blazar program (UMRAO), in combination with radiative transfer simulations of emission from a relativistic jet, to investigate the time-dependent flow conditions ...
Margo Aller, Philip Hughes, Hugh Aller, Talvikki Hovatta   +3 more
doaj   +1 more source