Results 61 to 70 of about 18,989 (273)

Proton Synchrotron Gamma-Rays and the Energy Crisis in Blazars [PDF]

Astrophysical Journal, 2020
The origin of high-energy emission in blazars jets (i.e., leptonic versus hadronic) has been a longstanding matter of debate. Here, we focus on one variant of hadronic models where proton synchrotron radiation accounts for the observed steady γ-ray ...
I. Liodakis, M. Petropoulou
semanticscholar   +1 more source

The power of blazar jets [PDF]

Monthly Notices of the Royal Astronomical Society, 2008
MNRAS, in press, changed Fig.
Celotti, Anna Lisa, GHISELLINI G.
openaire   +4 more sources

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, Viviana Arroyave, Douglas Laurence, Stephen Revesz, Gopal Bhatta, Hal Hollingsworth, Sarah Dhalla, Emily Howard, Michael Cioffi   +8 more
doaj   +1 more source

Optical spectroscopy of blazars for the Cherenkov Telescope Array [PDF]

Astronomy & Astrophysics, 2020
Context. Blazars are the most numerous class of High Energy (HE; E about 50 MeV - few 100 GeV) and Very High Energy (VHE; E about 100 GeV - 10 TeV) gamma-ray emitters.
P. Goldoni, S. Pita, C. Boisson, W. Max-Moerbeck, E. Kasai, D. Williams, F. D’Ammando, V. Navarro-Aranguiz, M. Backes, U. D. Almeida, J. Becerra-González, G. Cotter, O. Hervet, J. Lenain, E. Lindfors, H. Sol, S. Wagner   +16 more
semanticscholar   +1 more source

Near infrared polarimetry of a sample of blazars*

EPJ Web of Conferences, 2013
Polarization variability is one of the most ubiquitous characteristic of blazars. Near infrared (NIR)polarization measurements of blazars are not common, contrary to the optical ones.
Pulido J. A. Acosta, Pereyra A., Agudo I., Agulli I., Carnerero M., Segura N. Castro, Gómez J.L., Jorstad S., Marscher A.   +8 more
doaj   +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

A Machine Learning Approach for Predicting Black Hole Mass in Blazars Using Broadband Emission Model Parameters

Universe, 2022
Blazars are observed to emit non-thermal radiation across the entire electromagnetic spectrum from the radio to the very-high-energy γ-ray region. The broadband radiation measured from a blazar is dominated by emission from a relativistic plasma jet ...
Krishna Kumar Singh, Anilkumar Tolamatti, Sandeep Godiyal, Atul Pathania, Kuldeep Kumar Yadav   +4 more
doaj   +1 more source

Discovery of Hidden Blazars [PDF]

Science, 2001
Every radio-loud quasar may have blazar activities, according to a unified scheme where the differences in both optical and radio observations of radio-loud quasars are the result of different viewing angles. We have predicted that blazars may be detected using emission line ratio variations caused by variable illumination of gas clouds in the broad ...
Feng Ma, Beverley J. Wills
openaire   +3 more sources

A Model of Polarisation Rotations in Blazars from Kink Instabilities in Relativistic Jets

Galaxies, 2017
This paper presents a simple model of polarisation rotation in optically thin relativistic jets of blazars. The model is based on the development of helical (kink) mode of current-driven instability.
Krzysztof Nalewajko
doaj   +1 more source

Blazars at Very High Energies: Emission Modelling

Galaxies, 2022
Blazars are very broadband cosmic sources with spectra spanning over twenty orders of magnitude in frequency, down to the 100 MHz regime in the radio range, up to VHE at several tens of TeV.
Hélène Sol, Andreas Zech
doaj   +1 more source