Results 1 to 10 of about 1,170,090 (200)
Fractional Variability—A Tool to Study Blazar Variability [PDF]
Galaxies, 2019 Active Galactic Nuclei emit radiation over the whole electromagnetic spectrum up to TeV energies. Blazars are one subtype with their jets pointing towards the observer.
Bernd Schleicher +28 more
doaj +8 more sources
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 +4 more sources
Investigating Optical Variability of the Blazar S5 0716+714 on Diverse Timescales [PDF]
The Astrophysical JournalWe present the results of the observational study of the blazar S5 0716+716 in the optical bands B , V , R , and I between 2019 March and 2023 August to investigate its variability on diverse timescales.
Ergün Ege +3 more
doaj +3 more sources
X-ray Flux and Spectral Variability of Blazar H 2356-309
Galaxies, 2020 We present the results of timing and spectral analysis of the blazar H 2356-309 using XMM-Newton observations. This blazar is observed during 13 June 2005–24 December 2013 in total nine observations.
Kiran A. Wani, Haritma Gaur
doaj +4 more sources
Multi-Frequency Blazar Micro-Variability as a Tool to Investigate Relativistic Jets
Galaxies, 2016 For the past 12 years we have been studying optical micro-variability of a sample of 15 Blazars. We summarize the results of this study and draw some basic conclusions about the characteristics of micro-variability.
James R. Webb
doaj +3 more sources
Gamma-ray flares from relativistic magnetic reconnection in the jet of the quasar 3C 279 [PDF]
Nature Communications, 2020 Blazars show variable non-thermal emission across the electromagnetic spectrum from radio waves to gamma rays. Here, the authors show blazar 3C 279 reveals a characteristic peak-in-peak variability pattern on time scales of minutes if particle ...
A. Shukla, K. Mannheim
doaj +2 more sources
Polarimetric Properties of Blazars Caught by the WEBT
Galaxies, 2021 Active galactic nuclei come in many varieties. A minority of them are radio-loud, and exhibit two opposite prominent plasma jets extending from the proximity of the supermassive black hole up to megaparsec distances.
Claudia M. Raiteri, Massimo Villata
doaj +1 more source
The Structure of Micro-Variability in the WEBT BL Lacertae Observation
Galaxies, 2023 We present the results of an in-depth analysis of the Whole Earth Blazar Telescope (WEBT) micro-variability observations made during a campaign done in 2020 on the blazar BL Lacertae. The data consisted of 231 days of optical imaging and we separated the
James R. Webb, Ivan Parra Sanz
doaj +1 more source
Characterising the Long-Term Variability of Blazars in Leptonic Models
Galaxies, 2019 Most research on blazar variability focuses on individual flares to explain acceleration and radiation mechanisms and improve on current models. These short-time events (being minutes, hours, or days) might not be representative of the underlying ...
Hannes Thiersen +2 more
doaj +1 more source
The Long-Lasting Activity in the Flat Spectrum Radio Quasar (FSRQ) CTA 102
Galaxies, 2019 The flat spectrum radio quasar CTA 102 ( z = 1 . 032 ) went through a tremendous phase of variability. Since early 2016 the gamma-ray flux level has been significantly higher than in previous years. It was topped by a four month long giant outburst,
Michael Zacharias +5 more
doaj +1 more source