Results 101 to 110 of about 16,452 (194)

Recognizing Blazars Using Radio Morphology from the VLA Sky Survey

The Astrophysical Journal
Blazars are radio-loud active galactic nuclei whose jets have a very small angle to our line of sight. Observationally, the radio emissions are mostly compact or compact-core with a one-sided jet.
Zhang-Liang Xie, Eduardo Bañados, Silvia Belladitta, Chiara Mazzucchelli, Jan-Torge Schindler, Frederick Davies, Bram P. Venemans   +6 more
doaj   +1 more source

Variability in blazars [PDF]

Astronomy and Astrophysics Supplement Series, 1998
The results of both BVRI CCD photometric monitoring and fast photometry for 8 blazars and variable quasars are presented. There is intraday variability for 6 blazars and very short timescales (minutes to two hours) variability for 5 objects. Implications for relativistic beaming are briefly discussed.
Guibin Jia, Cen Xuefen, Ma Huiyu, Jiancheng Wang   +3 more
openaire   +1 more source

Lessons from the apparent peculiar nature of the star TYC 6544‐3483‐1

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract We report a radio and optical study of the star TYC 6544‐3483‐1 originally selected as a follow‐up target in the course of our efforts to cross‐identify Galactic high‐energy sources. The star by itself finally turned out to be a very ordinary main‐sequence star despite the initial expectations that apparently pointed to the contrary.
Josep Martí, Pedro L. Luque‐Escamilla, Benito Marcote, Daniel del Ser, Gustavo E. Romero, Cintia S. Peri   +5 more
wiley   +1 more source

Jets, black holes and disks in blazars

, 2013
The Fermi and Swift satellites, together with ground based Cherenkov telescopes, has greatly improved our knowledge of blazars, namely Flat Spectrum Radio Quasars and BL Lac objects, since all but the most powerful emit most of their electro-magnetic ...
Ghisellini, G.
core   +2 more sources

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

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

Multiwavelength properties of blazars [PDF]

Advances in Space Research, 1998
Blazar spectral energy distributions (SEDs) are double peaked and follow a self-similar sequence in luminosity. The so-called "blue" blazars, whose first SED component peaks at X-ray energies, are TeV sources, although with a relatively small fraction of their bolometric luminosities.
openaire   +3 more sources

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

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

A complete sample of LSP blazars fully described in $\gamma$-rays. New $\gamma$-ray detections and associations with Fermi-LAT

, 2018
We study the $\gamma$-ray and broadband spectral energy distribution (SED) properties of a complete sample of 104 bright, radio-selected low-synchrotron peaked (LSP) blazars.
Arsioli, B., Polenta, G.
core   +1 more source