Results 131 to 140 of about 33,870 (293)
Recognizing Blazars Using Radio Morphology from the VLA Sky Survey
The Astrophysical JournalBlazars are radio-loud active galactic nuclei whose jets have a very small angle to our line of sight. Observationally, the radio emissions are mostly compact or compact-core with a one-sided jet.
Zhang-Liang Xie +6 more
doaj +1 more source
Source Count Distribution of Fermi LAT Gamma-Ray Blazars Using Novel Nonparametric Methods
UniverseWe utilized a sample from the Fermi-LAT 14-year Source Catalog by adjusting the flux detection threshold, enabling us to derive the intrinsic source count distribution dN/dF25 of extragalactic blazars using nonparametric, unbinned methods developed by ...
Xuhang Yin, Houdun Zeng
doaj +1 more source
Galaxies, 2016 Since the mid-1980s, the shock-in-jet model has been the preferred paradigm to explain radio-band flaring in blazar jets. We describe our radiative transfer model incorporating relativistically-propagating shocks, and illustrate how the 4.8, 8, and 14.5 ...
Margo F. Aller +4 more
doaj +1 more source
Radiation processes in blazars [PDF]
AIP Conference Proceedings, 1997 We present an overview of the current theoretical models attempting to describe the structure and radiative processes operating in blazars and discuss the observational constraints that these models must confront.
openaire +3 more sources
Multi-TeV Flaring from High-energy Blazars: An Evidence of the Photohadronic Process [PDF]
Astrophysical Journal, 2019 High-energy peaked blazars are known to undergo episodes of flaring in GeV–TeV gamma-rays involving different timescales. This flaring mechanism is not well understood, despite long-term simultaneous multiwavelength observations.
S. Sahu +2 more
semanticscholar +1 more source
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 +2 more
wiley +1 more source
Chasing the Neutrino Blazar Candidates
The Astrophysical Journal Supplement SeriesIn our study of the correlations between IceCube-detected neutrino events and γ -ray properties of blazars, we recognize the inherent challenges posed by the limited detection of neutrinos.
Jingtian Zhu +5 more
doaj +1 more source
The RoboPol Program: Optical Polarimetric Monitoring of Blazars
Galaxies, 2019 After three years of polarimetric monitoring of blazars, the RoboPol project has uncovered several key characteristics of polarimetric rotations in the optical for these most variable sources.
Dmitry Blinov, Vasiliki Pavlidou
doaj +1 more source
High Frequency Peakers: young radio sources or flaring blazars? [PDF]
, 2004 We present new, simultaneous, multifrequency observations of 45 out of the 55 candidate High Frequency Peakers (HFP) selected by Dallacasa et al. (2000), carried out 3 to 4 years after a first set of observations.
A. Celotti +37 more
core +2 more sources
Optical Variability of TeV Blazars on long time-scales [PDF]
Monthly notices of the Royal Astronomical Society, 2019 We present the results of photometric observations of three TeV blazars, 3C 66A, S5 0954+658 and BL Lacertae, during the period 2013--2017. Our extensive observations were performed in a total of 360 nights which produced $\sim$6820 image frames in BVRI ...
H. Gaur +14 more
semanticscholar +1 more source