Results 91 to 100 of about 34,122 (236)

The Search for Neutrinos from TXS 0506+056 with the ANTARES Telescope [PDF]

EPJ Web of Conferences, 2019
A high-energy neutrino, IC170922A, detected by the IceCube experiment was found to be positionally coincident with the direction of a known blazar, TXS 0506+056, observed in γ-rays and at other wavelengths of the electromagnetic spectrum.
Illuminati Giulia
doaj   +1 more source

On leptonic models for blazars in the Fermi era

, 2011
Some questions raised by Fermi-LAT data about blazars are summarized, along with attempts at solutions within the context of leptonic models. These include both spectral and statistical questions, including the origin of the GeV breaks in low-synchrotron
Abdo A A, Abdo A A, Abdo A A, Abdo A A, Abdo A A, Abdo A A, Abdo A A, Abdo A A, Abdo A A, Abdo A A, Abdo A A, Ackermann M, Aharonian F, Aleksić J, Aloy M A, Atwood W B, Benoit Lott, Böttcher M, Böttcher M, Böttcher M, Charles Dermer, Chiaberge M, Dermer C D, Dermer C D, Dermer C D, Dermer C D, Dolag K, Finke J D, Finke J D, Gendre M A, Georganopoulos M, Hartman R C, Healey S E, Jorstad S G, Levinson A, Lähteenmäki A, Malmrose M P, Marscher A P, Meyer E T, Migliori G, Murase K, Neronov A, Padovani P, Poutanen J, Sikora M, Stern B E, Tavecchio F, Urry C M   +47 more
core   +1 more source

EGRET (GeV) Blazars

AIP Conference Proceedings, 2001
Invited review paper, to appear in the proceedings of the International Symposium on High Energy Gamma-Ray Astronomy, Heidelberg, June 2000, AIP Conference Proc.
openaire   +2 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

H.E.S.S. Monitoring of PKS 2155-304 in 2015 and 2016

Galaxies, 2019
PKS 2155-304 is one of the brightest blazar located in Southern Hemisphere, monitored with H.E.S.S. since the first light of the experiment. Here we report multiwavelength monitoring observations collected during the period of 2015–2016 with H.E.S.S ...
Alicja Wierzcholska, Michael Zacharias, Felix Jankowsky, Stefan Wagner, for for the H.E.S.S. Collaboration   +4 more
doaj   +1 more source

Multiwavelength Variability Power Spectrum Analysis of the Blazars 3C 279 and PKS 1510–089 on Multiple Timescales [PDF]

, 2022
A. Goyal, M. Soida, Ł. Stawarz, Paul J. Wiita, K. Nilsson, Svetlana G. Jorstad, Alan P. Marscher, M. F. Aller, H. D. Aller, A. Lähteenmäki, T. Hovatta, S. Zoła, Krzysztof Nalewajko, M. Tornikoski, J. Tammi, Mark Hodges, S. Kiehlmann, A. C. S. Readhead, W. Max-Moerbeck, E. Lindfors, V. Fallah Ramazanı, D. Reichart, D. B. Caton, Janeth Valverde, D. Horan, Roopesh Ojha, P. van Zyl   +26 more
openalex   +1 more source

A Unified Model for Multiepoch Neutrino Events and Broadband Spectral Energy Distribution of TXS 0506+056

The Astrophysical Journal
The blazar TXS 0506+056 has been proposed as a high-energy neutrino emitter. However, it has been shown that the standard one-zone model cannot produce sufficiently high neutrino flux due to constraints from the X-ray data, implying more complex ...
Zhen-Jie Wang, Ruo-Yu Liu, Ze-Rui Wang, Junfeng Wang   +3 more
doaj   +1 more source

Linkage between Accretion Disks and Blazars

, 2007
The magnetic field in an accretion disk is estimated assuming that all of the angular momentum within prescribed accretion disk radii is removed by a jet.
F. Aharonian, G.V. Bicknell, Geoffrey V. Bicknell, Jianke Li, K. Katarzyński, L. Maraschi, L. Mestel, N.I. Shakura, R.D. Blandford, Z. Kuncic   +9 more
core   +1 more source

Detection of a quasi-periodic oscillation in gamma-ray light curve of the high redshift blazar B2 1520+31

, 2018
We detected a possible quasi-periodic oscillation (QPO) of ~ 71 days in the 0.1 -- 300 GeV gamma-ray Fermi-LAT light curve of the high redshift flat spectrum radio quasar B2 1520+31.
Bambi, Cosimo, Gupta, Alok C., Kushwaha, Pankaj, Tripathi, Ashutosh, Wiita, Paul J., Zhang, Zhongli   +5 more
core   +1 more source

Variability of Blazars and Blazar Models over 38 Years [PDF]

Galaxies, 2016
Since 1978, when BL Lac objects and violently variable quasars were married to become “blazars”, physical interpretations of the phenomenon have evolved. Remarkably, though, the general picture of relativistic jets beaming their radiation in our direction, proposed that year by Blandford and Rees, remains intact.
openaire   +2 more sources