Results 41 to 50 of about 34,519 (239)
MOJAVE. XVII. Jet Kinematics and Parent Population Properties of Relativistically Beamed Radio-loud Blazars [PDF]
Astrophysical Journal, 2019 We present results from a parsec-scale jet kinematics study of 409 bright radio-loud active galactic nuclei (AGNs) based on 15 GHz Very Long Baseline Array (VLBA) data obtained between 1994 August 31 and 2016 December 26 as part of the 2 cm VLBA survey ...
M. Lister +12 more
semanticscholar +1 more source
WIREs Data Mining and Knowledge Discovery, Volume 12, Issue 5, September/October 2022., 2022 This work presents a text‐mining‐based scientometric analysis of the scientific output in the last three decades regarding the use of artificial intelligence and machine learning in the fields of astronomy and astrophysics. Abstract Since the beginning of the 21st century, the fields of astronomy and astrophysics have experienced significant growth at ...
José‐Víctor Rodríguez +2 more
wiley +1 more source
The Spectral Index Distribution of EGRET Blazars: Prospects for GLAST [PDF]
, 2007 The intrinsic distribution of spectral indices in GeV energies of gamma-ray--loud blazars is a critical input in determining the spectral shape of the unresolved blazar contribution to the diffuse extragalactic gamma-ray background, as well as an ...
Pavlidou, Vasiliki, Venters, Tonia M.
core +4 more sources
Review of Education, Volume 10, Issue 1, April 2022., 2022 Abstract Research‐practice partnerships (RPPs) have drawn a great deal of attention as promising structures for bringing educational research and practice closer together. However, promising as RPPs may be, challenges still exist and there have been calls for studies investigating how research can be used within RPPs, and how to include practitioners ...
Simon Sjölund +3 more
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
The Nature of Micro-Variability in Blazars
Galaxies, 2021 We present the results of a long-term study designed to investigate the nature of micro-variability in blazars carried out primarily at the Southeastern Association for Research in Astronomy (SARA) observatories.
James R. Webb +8 more
doaj +1 more source
Progress in Multi-Wavelength and Multi-Messenger Observations of Blazars and Theoretical Challenges [PDF]
Galaxies, 2019 This review provides an overview of recent advances in multi-wavelength and multi-messenger observations of blazars, the current status of theoretical models for blazar emission, and prospects for future facilities.
M. Boettcher
semanticscholar +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
Directional Association of TeV to PeV Astrophysical Neutrinos with Radio Blazars
, 2020 Recently we have shown that high-energy neutrinos above 200 TeV detected by IceCube are produced within several parsecs in the central regions of radio-bright blazars, that is active galactic nuclei with jets pointing toward us.
A. Plavin +3 more
semanticscholar +1 more source
Source-count Distribution of Gamma-Ray Blazars [PDF]
Astrophysical Journal, 2020 With 10 years of operation and an exceptional data set, the Fermi-Large Area Telescope allows us to unveil the detailed composition of the extragalactic γ-ray sky above 100 MeV. In this paper, we derive the intrinsic source-count distribution (logN–logS)
L. Marcotulli, M. D. Mauro, M. Ajello
semanticscholar +1 more source