Results 21 to 30 of about 23,536 (235)

Blazars at Very High Energies: Emission Modelling

Galaxies, 2022
Blazars are very broadband cosmic sources with spectra spanning over twenty orders of magnitude in frequency, down to the 100 MHz regime in the radio range, up to VHE at several tens of TeV.
Hélène Sol, Andreas Zech
doaj   +1 more source

The impact of guardian's usage of the Internet on children's cognitive skills

International Studies of Economics, Volume 18, Issue 2, Page 193-210, June 2023., 2023
Abstract In the digital age, the internet has become an essential source of information gathering and maintains a network of social contact. In this paper, we use microdata from the China Family Panel Studies to examine the effects of guardian's internet use on teenager's cognitive skills.
Guangsu Zhou, Keyi Guo
wiley   +1 more source

Multi-Wavelength Intra-Day Variability and Quasi-Periodic Oscillation in Blazars

Galaxies, 2017
We reviewed multi-wavelength blazars variability and detection of quasi-periodic oscillations on intra-day timescales. The variability timescale from a few minutes to up to less than a days is commonly known as intra-day variability.
Alok C. Gupta
doaj   +1 more source

Basic properties of Fermi blazars and the ‘blazar sequence’ [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
13 pages, 1 table, 13 figures, accepted for publication in MNRAS.
Xiong, Dingrong, Zhang, Xiong, Bai, Jinming, Zhang, Haojing   +3 more
openaire   +2 more sources

Multiwavelength astrophysics of the blazar OJ 287 and the project MOMO

Astronomische Nachrichten, Volume 344, Issue 4, May 2023., 2023
Abstract We are carrying out the densest and longest multiyear, multiwavelength monitoring project of OJ 287 ever done. The project MOMO (Multiwavelength Observations and Modeling of OJ 287) covers wavelengths from the radio to the high‐energy regime. A few selected observations are simultaneous with those of the Event Horizon Telescope (EHT).
S. Komossa, A. Kraus, D. Grupe, M.L. Parker, A. Gonzalez, L.C. Gallo, M.A. Gurwell, S. Laine, S. Yao, S. Chandra, L. Dey, J.L. Gómez, K. Hada, D. Haggard, A.R. Hollett, H. Jermak, S. Jorstad, T.P. Krichbaum, S. Markoff, C. McCall, J. Neilsen, M. Nowak   +21 more
wiley   +1 more source

To what extent a modern teaching style benefits students? Why do teachers act the way they do?

Journal of Computer Assisted Learning, Volume 39, Issue 2, Page 578-590, April 2023., 2023
Abstract Background The growth of teaching practices conducted to promote cognitive activation and active participation in the classroom in recent years has become the epicentre of an active debate regarding their effectiveness. Objectives This study is aimed to shed some light on this topic by empirically analysing the causes and consequences of more ...
Adriano Villar‐Aldonza
wiley   +1 more source

General Physical Properties of Fermi Blazars

The Astrophysical Journal Supplement Series, 2023
We study the general physical properties of Fermi blazars using the Fermi fourth source catalog data (4FGL-DR2). The quasi-simultaneous multiwavelength data of Fermi blazars are fitted by using the one-zone leptonic model to obtain some physical ...
Yongyun Chen, Qiusheng Gu, Junhui Fan, Xiaoling Yu, Xiaogu Zhong, Hongyu Liu, Nan Ding, Dingrong Xiong, Xiaotong Guo   +8 more
doaj   +1 more source

The Blazar Sequence and Its Physical Understanding

Galaxies, 2022
Introduced in 1998 to attempt a first unified view of the broad-band emission properties of blazars, the blazar sequence has been extensively used in the past 25 years to guide observations as well as the physical interpretation of the overall emission ...
Elisa Prandini, Gabriele Ghisellini
doaj   +1 more source

Blazar Optical Variability in the Palomar-QUEST Survey [PDF]

, 2009
We study the ensemble optical variability of 276 FSRQs and 86 BL Lacs in the Palomar-QUEST Survey with the goal of searching for common fluctuation properties, examining the range of behavior across the sample, and characterizing the appearance of ...
Adelman-McCarthy, Anne Bauer, Baltay, Bauer, Bonning, Charles Baltay, Chatterjee, Cohen, Collier, Collinge, D'Arcangelo, David Rabinowitz, Fanaroff, Healey, Healey, Heidt, Jonathan Jerke, Kartaltepe, Kellermann, Li, Lister, Massaro, Monet, Nancy Ellman, Padovani, Paolo Coppi, Peterson, Richard Scalzo, Sowards-Emmerd, Vanden Berk   +29 more
core   +1 more source

The contribution of Fermi-2LAC blazars to the diffuse TeV-PeV neutrino flux [PDF]

, 2016
The recent discovery of a diffuse cosmic neutrino flux extending up to PeV energies raises the question of which astrophysical sources generate this signal. One class of extragalactic sources which may produce such high-energy neutrinos are blazars.
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core   +3 more sources