Results 21 to 30 of about 6,255 (211)
The Astrophysical Journal, 2023 Recent works have developed samples of blazars from among the Fermi Large Area Telescope unassociated sources via machine-learning comparisons with known blazar samples. Continued analysis of these new blazars tests the predictions of the blazar sequence
Stephen Kerby, Abraham D. Falcone
doaj +1 more source
Multifrequency observations of Blazars
, 1987 This paper reports the results of a programme of multifrequency observations of a sample of Blazars concentrating particularly on the millimetre through infrared region.
Gear, Walter Kieran +2 more
core +7 more sources
Basic properties of Fermi blazars and the ‘blazar sequence’ [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 By statistically analyzing a large sample which includes blazars of Fermi detection (FBs) and non-Fermi detection (NFBs), we find that there are significant differences between FBs and NFBs for redshift, black hole mass, jet kinetic power from "cavity" power, broad-line luminosity, and ratio of core luminosity to absolute V-band magnitude ($R_{\rm v}$),
Xiong, Dingrong +3 more
openaire +2 more sources
SYNCHROTRON POLARIZATION IN BLAZARS [PDF]
The Astrophysical Journal, 2014 We present a detailed analysis of time- and energy-dependent synchrotron polarization signatures in a shock-in-jet model for gamma-ray blazars. Our calculations employ a full 3D radiation transfer code, assuming a helical magnetic field throughout the jet.
Haocheng Zhang +2 more
openaire +4 more sources
The recognition of blazars and the blazar spectral sequence [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 Accepted for publication in ...
Antón, S., Browne, I. W A
openaire +2 more sources
Unifying MeV-blazars with GeV-blazars [PDF]
, 2002 We demonstrate that the spectral differences between Flat Spectrum Radio Quasars (FSRQ) with steep gamma-ray spectra (MeV-blazars) and FSRQ with flat gamma-ray spectra (GeV-blazars) can be explained by assuming that in the MeV-blazars, the production of gamma-rays is dominated by Comptonization of infrared radiation of hot dust, whereas in the GeV ...
Blazejowski, M. +3 more
openaire +3 more sources
X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304
Galaxies, 2020 We reviewed X-ray flux and spectral variability properties studied to date by various X-ray satellites for Mrk 421 and PKS 2155-304, which are TeV emitting blazars. Mrk 421 and PKS 2155-304 are the most X-ray luminous blazars in the northern and southern
Alok C. Gupta
doaj +1 more source
Exploring TeV Candidates of Fermi Blazars through Machine Learning
The Astrophysical Journal, 2023 In this work, we make use of a supervised machine-learning algorithm based on Logistic Regression (LR) to select TeV blazar candidates from the 4FGL-DR2/4LAC-DR2, 3FHL, 3HSP, and 2BIGB catalogs.
J. T. Zhu +5 more
doaj +1 more source
High-energy neutrino emission from blazars [PDF]
, 2022 Active galactic nuclei (AGN) with relativistic jets are the most powerful persistent astrophysical sources of electromagnetic radiation in the Universe.
Foteini Oikonomou, Oikonomou, Foteini
core +1 more source
Radio core-dominance of Fermi-blazars: implication for blazar unification [PDF]
Astrophysics and Space Science, 2021 ...The distribution of radio core-dominance is consistent with average projection angles of 13.5, 14.8, 16.8, 20.4, and 28.2 for ISPs, LSPs, FSRQs, HSPs, and radio galaxies, respectively. Linear regression analyses of our data yield significant anti-correlation r greater than 0.60 between core-dominance parameter and extended luminosity in each ...
E. U. Iyida, F. C. Odo, A. E. Chukwude
openaire +2 more sources