Results 41 to 50 of about 20,672 (255)
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 +3 more
openaire +2 more sources
A tool to understand emission mechanisms of blazars through their high‐energy gamma‐ray emission
Astronomische Nachrichten, Volume 344, Issue 6, August 2023., 2023 The blazar SED is characterized by two energy components. Evidence suggests that the low‐energy component is generated by the synchrotron mechanism, but for the high‐energy component, the mechanism is still uncertain. Two main models have been proposed to explain this emission. According to the leptonic model, a correlation between the emission of both
Mabel Osorio +3 more
wiley +1 more source
A Search for Blazar-Like Radio-Loud Narrow-Line Seyfert 1 Galaxies
Galaxies, 2017 We report the results of an observational program to investigate the gamma-ray and optical variability properties of the vRL NLSY1 galaxies listed in the Yuan et al. sample. We have identified 17 members of the Yuan et al. sample possibly associated with
Hugh R. Miller +6 more
doaj +1 more source
Is OJ 287 a Single Supermassive Black Hole?
Universe, 2020 Light curves for more than century optical photometric observations of the blazar OJ 287 reveals strong flares with a quasi-period of about 12 years. For a long time, this period has been interpreted by processes in a binary black hole system. We propose
Marina S. Butuzova +1 more
doaj +1 more source
Evolving parsec-scale radio structure in the most distant blazar known [PDF]
Nature Communications, 2020 Blazars are a sub-class of quasars with Doppler boosted jets oriented close to the line of sight, and thus efficient probes of supermassive black hole growth and their environment, especially at high redshifts.
T. An +9 more
semanticscholar +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
What We Talk about When We Talk about Blazars?
Frontiers in Astronomy and Space Sciences, 2017 After the discovery of powerful relativistic jets from Narrow-Line Seyfert 1 Galaxies, and the understanding of their similarity with those of blazars, a problem of terminology was born.
Luigi Foschini
doaj +1 more source
The “Blazar Sequence” in the TeV Band
The Astrophysical Journal, 2023 The “blazar sequence” has been proposed for more than 20 yr, yet its nature is still unclear. In this work, for the first time we expand this topic to the TeV band by using a sample of 58 TeV blazars, including 48 blazars in the quiescent state and 21 ...
Zhihao Ouyang +9 more
doaj +1 more source
The CLASS blazar survey: testing the blazar sequence [PDF]
Monthly Notices of the Royal Astronomical Society, 2004 We discuss the properties of the sources in the CLASS Blazar survey which aims at the selection of low radio power (P(5GHz)<10^25 W Hz^-1) blazars. We use VLA data from available catalogues and from our own observations to constrain the radio core-dominance of the sample which, together with the flat radio spectral index, is a signature of the ...
Caccianiga, A., Marcha, M. J. M.
openaire +2 more sources
The Fermi blazar sequence [PDF]
, 2017 We revisit the blazar sequence exploiting the complete, flux limited sample of blazars with known redshift detected by the Fermi satellite after 4 years of operations (the 3LAC sample).
G. Ghisellini +4 more
semanticscholar +1 more source